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0% SSCE/NECO/GCE (CHEMISTRY PAST QUESTIONS) CHEMISTRY PAST QUESTIONS APP Questions will be picked at random from the question bank.You can use the NEXT button to move to the next question, use the PREV button to move to the previous question, the CLEAR button to clear any answer of your choice and you have the FINISH button to end the exam if you choose to.Any question not answered before the end of the exam time, will be marked as wrong and the exam will end by itself. so try to attempt all questions on time.Goodluck! 1 / 80 Category: CHEMISTRY PAST QUESTIONS A sheet of paper is placed in the path of a beam from a radioactive source. The emissions that pass through the paper consist of beta particles and gamma rays alpha and beta particles alpha particles and gamma rays alpha particles only 2 / 80 Category: CHEMISTRY PAST QUESTIONS Consider the following equation: Ag+ (aq) + CI-(aq) → Ag+CI- (s) ; ∆H = _65.7 kJmol-1. From the equation, it can be deduced that direct combination is involved and the reaction is endothermic a solid is formed and heat is evolved activation energy is high and a catalyst is required the reaction is endothermic and occurs at high temperature 3 / 80 Category: CHEMISTRY PAST QUESTIONS A mixture of calcium chloride and calcium trioxocarbonate (IV) in water can be separated by sublimation evaporation distillation filtration 4 / 80 Category: CHEMISTRY PAST QUESTIONS A finely divided from of a metal burns more readily in air than the rod from because the rod has smaller surface area higher molar mass protective oxide coating different chemical properties 5 / 80 Category: CHEMISTRY PAST QUESTIONS What will be the effect of increase in pressure on the following system at equilibrium? 2NH2(g) N2(g) + 3H2(g) Activation energy will decrease the concentration of ammonia will increase the forward reaction will be favoured the reaction will go to completion 6 / 80 Category: CHEMISTRY PAST QUESTIONS Which of the orbitals 4s, 4p, 4d and 4f has the lowest energy? 4p 4s 4f 4d 7 / 80 Category: CHEMISTRY PAST QUESTIONS Pauli Exclusion Principle is related to electronegativity values of elements quantum numbers of electrons collision theory of reaction rates reversiblility of equlibrium reactions 8 / 80 Category: CHEMISTRY PAST QUESTIONS In the Periodic Table, the elements that loss electrons most readily belong to Group 1 A Group V11 A Group 11 A Group 111 A 9 / 80 Category: CHEMISTRY PAST QUESTIONS One mole of a compound M(HCO3)2 has a mass of 162g. Calculate the relative atomic mass of M. [H = 1, C =12, O = 16] 122 53 101 40 10 / 80 Category: CHEMISTRY PAST QUESTIONS Given that the order of reactivity of four metals is P>Q>R>S, which of the following reactions is feasible? S + Q+ → Q + S+ Q + S+ → S + Q+ R + P+ → P + R+ S + P+ → P + S + 11 / 80 Category: CHEMISTRY PAST QUESTIONS Which of the following compounds dissolves in water to form a solution with pH below 7? Sodium tetraoxosulphate (VI) Ammonium chloride Potassium hydroxide Sodium trioxocarbonate (IV) 12 / 80 Category: CHEMISTRY PAST QUESTIONS Elements which belong to the same group in the Periodic Table are characterized by difference of 14 atomic mass units between successive members presence of the same number of outermost electrons in the respective atoms difference of +1 in the oxidation numbers of successive members presence of the same number of electron shells in the respective atoms 13 / 80 Category: CHEMISTRY PAST QUESTIONS What mass of copper would be deposited by a current of 1. 0 ampere passing for 965 seconds through copper (ll) tetraoxosulphate (IV) solution? [Cu = 63.5; 1F = 96500C] 18g 0.635g 0.318g 6.35g 14 / 80 Category: CHEMISTRY PAST QUESTIONS What is the oxidation number of nitrogen in AI(NO3)3? + 6 + 5 + 3 + 1 15 / 80 Category: CHEMISTRY PAST QUESTIONS Substances which absorb water from the atmosphere without dissolving in it are said to be hydrated insolube hygroscopic anhydrous 16 / 80 Category: CHEMISTRY PAST QUESTIONS Which of the following occurs when a solution of CuSO4 is electrolysed using copper electrodes? The cathode becomes coated with copper Both electrodes gain electrons The anode increases in mass The blue colour of the solution fades gradually 17 / 80 Category: CHEMISTRY PAST QUESTIONS Which of the following will produce oxygen and hydrogen during its electrolysis using platinum electrode? Concentrated hydrochloric acid Dilute sodium chloride solution Aqueous copper (ll) tetraoxosulphate (IV) Glucose solution 18 / 80 Category: CHEMISTRY PAST QUESTIONS Chlorine atom forms CI by Gaining one electron Losing one electron Sharing one electron Donating lone pair of electrons 19 / 80 Category: CHEMISTRY PAST QUESTIONS The crystal layers in graphite are held together by covalent bonds van der Waals' forces hydrogen bonds electrostatic forces 20 / 80 Category: CHEMISTRY PAST QUESTIONS Exhaust fumes discharged from a smoky vehicle gradually become invisible as a result of diffusion absorption emission combustion 21 / 80 Category: CHEMISTRY PAST QUESTIONS What type of reaction is involved when wood shavings produce a brown gas with concentrated HNO3? Destructive distillation Redox reaction Dehydration Nutralization 22 / 80 Category: CHEMISTRY PAST QUESTIONS Which of the following contains co-ordinate covalent bond? Na+CI HCI CH4 NH4 23 / 80 Category: CHEMISTRY PAST QUESTIONS Calcium atom ionizes by gaining two electrons losing two electrons sharing two electrons gaining two protons 24 / 80 Category: CHEMISTRY PAST QUESTIONS Equal volumes of CO2 cnd CO at s.t.p have the same density rate of diffusion mass number of molecules 25 / 80 Category: CHEMISTRY PAST QUESTIONS The gas evolved when dilute tetraoxosulphate (VI) acid reacts with sodium hydrogen trioxocarbonate (IV) is sulphur (VI) oxide carbon (IV) oxide hydrogen oxygen 26 / 80 Category: CHEMISTRY PAST QUESTIONS Which of the following properties increases down a group in the Periodic Table? Ionization energy Electronegativity Electon affinity Atomic radius 27 / 80 Category: CHEMISTRY PAST QUESTIONS It can be concluded that gastric juice is a mixture contains enzymes is acidic has pH value of 7 28 / 80 Category: CHEMISTRY PAST QUESTIONS A reaction is represented by the equation below. A2(g) + B2(g) 2AB(g); ∆H = +X kJmol-1 Which of the following statements about the system is correct? The forward reaction is exthermic Pressure has no effect on the equilibrium mixture At equilibrium increase in temperature favours the reverse reaction The reaction goes to completion at equilibrium 29 / 80 Category: CHEMISTRY PAST QUESTIONS If an element with high electron affinity combines with another element with low ionization energy the bond formed will be mainly covalent ionic dative metallic 30 / 80 Category: CHEMISTRY PAST QUESTIONS Which of the following methods is suitable for the preparation of an insoluble salt? Neutralisation Action of an acid on a trioxocarbonate (IV) Double decomposition Action of an acid on a metal 31 / 80 Category: CHEMISTRY PAST QUESTIONS Which of the following lowers the activation energy of a chemical reaction? Reducing agent Freezing mixture Catalyst Water 32 / 80 Category: CHEMISTRY PAST QUESTIONS Which of the following compounds dissolves in water to give an alkaline solution? Potassium oxide Ammonium chloride Sulphur (IV) oxide Sodium chloride 33 / 80 Category: CHEMISTRY PAST QUESTIONS The spontaneity of a chemical reaction is determined by the change in the concentration of the reactants free energy of the system temperature of the system pressure applied to the system 34 / 80 Category: CHEMISTRY PAST QUESTIONS Which of the following non-metals reacts most readily with metals? Carbon Chlorine Sulphur Nitrogen 35 / 80 Category: CHEMISTRY PAST QUESTIONS Which of the following statements about ideal gases is/are correct?I. The cohesive forces between their particles are negligiblell. The have no definite volume but occupy the volume of their containersIII. They are not compressibleIV. Their particles collide with loss of energy l, ll, lll, and IV l and ll only l, ll and lll only l only 36 / 80 Category: CHEMISTRY PAST QUESTIONS Rusting of iron is an example of deliquescence displacement reaction decomposition redox reaction 37 / 80 Category: CHEMISTRY PAST QUESTIONS Two radioactive elements Q and S have half-life periods of 10 hours and 20 hours respectively. Therefore S decays faster than Q Q is twice as stable as S S is more stable than Q Q emits fewer particles than S 38 / 80 Category: CHEMISTRY PAST QUESTIONS If the solubility of KHCO3 is 0.40 mole dm-3 100.0g 4.0g 40.0g 10.0g 39 / 80 Category: CHEMISTRY PAST QUESTIONS Which of the following increases as boiling water changes to steam? activation energy degree of disorder in the system temperature of the system number of molecules 40 / 80 Category: CHEMISTRY PAST QUESTIONS Aluminium is extracted from magnetite cryolite cassiterite bauxite 41 / 80 Category: CHEMISTRY PAST QUESTIONS What volume of hydrogen is produced at s.t.p. When 2.60 g of zinc reacts with excess HCI according to the following equation? Zn(s) + 2HCI(aq) → ZnCI 2(aq) + H2(g) [Zn = 65; 1 mole of a gas occupies 22.4dm3 at s.t.p] 0.040dm 3 8.62dm 3 0.896dm 3 5.82dm 3 42 / 80 Category: CHEMISTRY PAST QUESTIONS 0.10 mol dm-3 NaCI conducts electricity better than 0.10 mol dm-3 CH3COOH because the solution of NaCI has a lower molar mass contains more ions has a higher pH is neutral to litmus 43 / 80 Category: CHEMISTRY PAST QUESTIONS A radioactive solid is best stored under paraffin oil in a cool, dark cupboard in a box lined with lead under ultraviolet light 44 / 80 Category: CHEMISTRY PAST QUESTIONS What is the shape of a molecule of CCI4? Pyramidal Tetrahedral Trigonal planar Linear 45 / 80 Category: CHEMISTRY PAST QUESTIONS Chemical equilibrium is attained when concentrations of the products are greater than those of the reactants reactants stop forming the products reactants in the system are used up concentrations of the reactants and products remain constant 46 / 80 Category: CHEMISTRY PAST QUESTIONS Helium is preferred to hydrogen in filling balloons because hydrogen is a component of water is inflammable exhibits isotopy is diatomic 47 / 80 Category: CHEMISTRY PAST QUESTIONS The atoms of four elements are represented as 20Q, 16R, 10S and 8T Which of the elements would be unreactive? S T R Q 48 / 80 Category: CHEMISTRY PAST QUESTIONS Which of the following movements can be described as random motion? gas molecules colliding in a flask car travelling on a straight line wheelbarrow being pushed planets going round the sun 49 / 80 Category: CHEMISTRY PAST QUESTIONS 30cm3 pf hydrogen at s.t.p combine with 20cm3 of oxygen to form steam according to the following equation 2H2(g) + O2(g) → 2H2O(g). Calculate the total volume of the gaseous mixture at the end of the reaction 35cm cube 50cm cube 25cm cube 30cm cube 50 / 80 Category: CHEMISTRY PAST QUESTIONS Which of the following is not correct about oxidation number convention? The oxidation number of a/an element in the free state is zero alkali meta like sodium in its compounds is + 1 atom of a diatomic molecules is + 2 monatomic ion is equal to its charge 51 / 80 Category: CHEMISTRY PAST QUESTIONS What does ∆H represent in the following equation ? Cl(g) + e- → CI- (g); ∆H = - 363 kJ mol-1 Dissociation energy Electron affinity Heat of atomization lonization energy 52 / 80 Category: CHEMISTRY PAST QUESTIONS A concentrated solution containing H+, Cu2+,OH- and CI- was electrolysed using platiunm electrodes which of the ions will be discharged at the cathods? H+ OH- Cu2+ CI- 53 / 80 Category: CHEMISTRY PAST QUESTIONS P Total = F1 + P2 + P 3 + .........Pn' where P Total is the pressure of a mixture of gasses. The equation above is an expression of Boyle's law Gay-Lussac's Law Dalton's law Graham's law 54 / 80 Category: CHEMISTRY PAST QUESTIONS What is responsible for metallic bonding? Sharing of electrons between the metal atoms transfer of electrons from one atom to another Attraction between the atomic unclei and cloud of electrons Attraction between positive and negative ions 55 / 80 Category: CHEMISTRY PAST QUESTIONS Petrol consists mainly of alktanols hydrocarbons alkanoates polymers 56 / 80 Category: CHEMISTRY PAST QUESTIONS The type of chemical bond that exists between potassium and oxygen in potassium oxide is covalent dative metallic ionic 57 / 80 Category: CHEMISTRY PAST QUESTIONS How many electrons are removed from Cr2- when it is oxidized to CrO42-? 0 2 4 8 58 / 80 Category: CHEMISTRY PAST QUESTIONS Electrovalent compounds are characterized by solubility in ethanol strong oxidizing ability high molar mass high melting point 59 / 80 Category: CHEMISTRY PAST QUESTIONS Dehydration of ethanol produces propan-1,2,3-triol ethene ethanal ethanoic acid 60 / 80 Category: CHEMISTRY PAST QUESTIONS Consider the reaction represented by the following equation: H2(g) + 12(g) → 2HI(g). The number of effective collisions of molecules of the reactants decreases as a catalysty is intoduced into the system the pressure increased the volume of the system is increased the temperature is raised 61 / 80 Category: CHEMISTRY PAST QUESTIONS What is the value of x in the following equation? Cr2O72- + 14H+ + xe- → 2Cr3+ + 7H2O 6 8 1 12 62 / 80 Category: CHEMISTRY PAST QUESTIONS Pipe-borne water is usually chlorinated in order to improve the teste of the water coagulate sediments in the water remove the hardness in the water clear kill harmful bacteria in the water 63 / 80 Category: CHEMISTRY PAST QUESTIONS An exothermic reaction is one which involves evolution of gas as it proceeds loss of heat to the surrounding positive change in value of enthalpy attainment of dynamic equilibrium 64 / 80 Category: CHEMISTRY PAST QUESTIONS Which of the following features of a human skeleton can be determined by carbon-dating? Mass Age Height Race 65 / 80 Category: CHEMISTRY PAST QUESTIONS When alkanols react with sodium, the ga evolved is ethyne hydrogen methane oxygen 66 / 80 Category: CHEMISTRY PAST QUESTIONS The property of calcium chloride which makes it useful as a drying agent is that it is a strong electrolyte deliquescent a normal salt ionic 67 / 80 Category: CHEMISTRY PAST QUESTIONS Which of the following can undergo both addition reactions and substitution reactions? Pentane Benzene Propene Hexane 68 / 80 Category: CHEMISTRY PAST QUESTIONS The liquid product of the destructive distillation of coal is kerosene ammoniacal liquor paraffin oil ethanol 69 / 80 Category: CHEMISTRY PAST QUESTIONS What is the function of sulphur (IV) oxide in the reaction represented by the following equation? SO 2(aq) + 2H2S(g) → 3S (s) + 2H 2O (l) Acid Dehydrating agent Bleaching agent Oxidising agent 70 / 80 Category: CHEMISTRY PAST QUESTIONS Which of the following procedures is suitable for identifying the food colouring added to a pastry sample? Both electrodes gain electrons The cathode becomes coated with copper The blue colour of the solution fades gradually The anode increases in mass 71 / 80 Category: CHEMISTRY PAST QUESTIONS Elactrostatic force of attraction between sodium ion and halide ion is greatest in NaBr NaF NaCI NaI 72 / 80 Category: CHEMISTRY PAST QUESTIONS Which of the following will displace copper from a solution of copper (ll) salt? Aluminium ions Zinc ions Magnesium Silver 73 / 80 Category: CHEMISTRY PAST QUESTIONS What is the effect of using vanadium (V) oxide as catalyst in the reaction represented by the following equation? 2SO2 + O2 ⇌ 2SO3; ∆H = - xKJmol-1 Increases the collision rate of reactant particles Reduces the time for attainment of equilibrium Shifts equilibrium position to the right Decreases the value of ∆H 74 / 80 Category: CHEMISTRY PAST QUESTIONS The presence of unpaired electrons in an atom of a transition metal gives rise to nalleability paramagnetism shiny appearance ductility 75 / 80 Category: CHEMISTRY PAST QUESTIONS Gas molecules are said to be perfectly elastic because they move about in straight lines the distances between them are negligible they collide without loss of energy the volume occupied by them is negligible 76 / 80 Category: CHEMISTRY PAST QUESTIONS Which of the following pairs of reagents recat to produce hydrogen? Copper and dilute hydrochloric acid Zinc and concentrated trioxonitrate (V) acid Magnesium and dilute tetraoxosulphate (VI) acid Water and calcium dicarbide 77 / 80 Category: CHEMISTRY PAST QUESTIONS Metals are said to be malleable because they are good conductors of electricity can be alloyed can be beaten into sheets are good conductors heat 78 / 80 Category: CHEMISTRY PAST QUESTIONS What is oxidized in the reaction represented by the following equation? 3CU + 8HNO3 → 3Cu(NO3)2 + 2NO + 4H2O Nitrogen Copper Oxygen Hydrogen 79 / 80 Category: CHEMISTRY PAST QUESTIONS Which of the following would dissolve in warm dilute H2SO4 without effervescence, to give a blue solution? Copper alloy Copper turnings Copper (ll) trioxocarbonate (IV) Copper (ll) oxide 80 / 80 Category: CHEMISTRY PAST QUESTIONS Which of the following substances decomposes when an electric current is passed through it? Hydrochloric acid Glucose solution Tetrachlormethane Zinc rod Your score is 0% Restart quiz
SSCE/NECO/GCE (CHEMISTRY PAST QUESTIONS)
CHEMISTRY PAST QUESTIONS APP
Questions will be picked at random from the question bank.
You can use the NEXT button to move to the next question, use the PREV button to move to the previous question, the CLEAR button to clear any answer of your choice and you have the FINISH button to end the exam if you choose to.
Any question not answered before the end of the exam time, will be marked as wrong and the exam will end by itself. so try to attempt all questions on time.
Goodluck!
1 / 80
Category: CHEMISTRY PAST QUESTIONS
A sheet of paper is placed in the path of a beam from a radioactive source. The emissions that pass through the paper consist of
2 / 80
Consider the following equation: Ag+ (aq) + CI-(aq) → Ag+CI- (s) ; ∆H = _65.7 kJmol-1. From the equation, it can be deduced that
3 / 80
A mixture of calcium chloride and calcium trioxocarbonate (IV) in water can be separated by
4 / 80
A finely divided from of a metal burns more readily in air than the rod from because the rod has
5 / 80
What will be the effect of increase in pressure on the following system at equilibrium? 2NH2(g) N2(g) + 3H2(g)
6 / 80
Which of the orbitals 4s, 4p, 4d and 4f has the lowest energy?
7 / 80
Pauli Exclusion Principle is related to
8 / 80
In the Periodic Table, the elements that loss electrons most readily belong to
9 / 80
One mole of a compound M(HCO3)2 has a mass of 162g. Calculate the relative atomic mass of M. [H = 1, C =12, O = 16]
10 / 80
Given that the order of reactivity of four metals is P>Q>R>S, which of the following reactions is feasible?
11 / 80
Which of the following compounds dissolves in water to form a solution with pH below 7?
12 / 80
Elements which belong to the same group in the Periodic Table are characterized by
13 / 80
What mass of copper would be deposited by a current of 1. 0 ampere passing for 965 seconds through copper (ll) tetraoxosulphate (IV) solution? [Cu = 63.5; 1F = 96500C]
14 / 80
What is the oxidation number of nitrogen in AI(NO3)3?
15 / 80
Substances which absorb water from the atmosphere without dissolving in it are said to be
16 / 80
Which of the following occurs when a solution of CuSO4 is electrolysed using copper electrodes?
17 / 80
Which of the following will produce oxygen and hydrogen during its electrolysis using platinum electrode?
18 / 80
Chlorine atom forms CI by
19 / 80
The crystal layers in graphite are held together by
20 / 80
Exhaust fumes discharged from a smoky vehicle gradually become invisible as a result of
21 / 80
What type of reaction is involved when wood shavings produce a brown gas with concentrated HNO3?
22 / 80
Which of the following contains co-ordinate covalent bond?
23 / 80
Calcium atom ionizes by
24 / 80
Equal volumes of CO2 cnd CO at s.t.p have the same
25 / 80
The gas evolved when dilute tetraoxosulphate (VI) acid reacts with sodium hydrogen trioxocarbonate (IV) is
26 / 80
Which of the following properties increases down a group in the Periodic Table?
27 / 80
It can be concluded that gastric juice
28 / 80
A reaction is represented by the equation below. A2(g) + B2(g) 2AB(g); ∆H = +X kJmol-1 Which of the following statements about the system is correct?
29 / 80
If an element with high electron affinity combines with another element with low ionization energy the bond formed will be mainly
30 / 80
Which of the following methods is suitable for the preparation of an insoluble salt?
31 / 80
Which of the following lowers the activation energy of a chemical reaction?
32 / 80
Which of the following compounds dissolves in water to give an alkaline solution?
33 / 80
The spontaneity of a chemical reaction is determined by the change in the
34 / 80
Which of the following non-metals reacts most readily with metals?
35 / 80
Which of the following statements about ideal gases is/are correct?
I. The cohesive forces between their particles are negligible
ll. The have no definite volume but occupy the volume of their containers
III. They are not compressible
IV. Their particles collide with loss of energy
36 / 80
Rusting of iron is an example of
37 / 80
Two radioactive elements Q and S have half-life periods of 10 hours and 20 hours respectively. Therefore
38 / 80
If the solubility of KHCO3 is 0.40 mole dm-3
39 / 80
Which of the following increases as boiling water changes to steam?
40 / 80
Aluminium is extracted from
41 / 80
What volume of hydrogen is produced at s.t.p. When 2.60 g of zinc reacts with excess HCI according to the following equation? Zn(s) + 2HCI(aq) → ZnCI 2(aq) + H2(g) [Zn = 65; 1 mole of a gas occupies 22.4dm3 at s.t.p]
42 / 80
0.10 mol dm-3 NaCI conducts electricity better than 0.10 mol dm-3 CH3COOH because the solution of NaCI
43 / 80
A radioactive solid is best stored
44 / 80
What is the shape of a molecule of CCI4?
45 / 80
Chemical equilibrium is attained when
46 / 80
Helium is preferred to hydrogen in filling balloons because hydrogen
47 / 80
The atoms of four elements are represented as 20Q, 16R, 10S and 8T Which of the elements would be unreactive?
48 / 80
Which of the following movements can be described as random motion?
49 / 80
30cm3 pf hydrogen at s.t.p combine with 20cm3 of oxygen to form steam according to the following equation 2H2(g) + O2(g) → 2H2O(g). Calculate the total volume of the gaseous mixture at the end of the reaction
50 / 80
Which of the following is not correct about oxidation number convention? The oxidation number of a/an
51 / 80
What does ∆H represent in the following equation ? Cl(g) + e- → CI- (g); ∆H = - 363 kJ mol-1
52 / 80
A concentrated solution containing H+, Cu2+,OH- and CI- was electrolysed using platiunm electrodes which of the ions will be discharged at the cathods?
53 / 80
P Total = F1 + P2 + P 3 + .........Pn' where P Total is the pressure of a mixture of gasses. The equation above is an expression of
54 / 80
What is responsible for metallic bonding?
55 / 80
Petrol consists mainly of
56 / 80
The type of chemical bond that exists between potassium and oxygen in potassium oxide is
57 / 80
How many electrons are removed from Cr2- when it is oxidized to CrO42-?
58 / 80
Electrovalent compounds are characterized by
59 / 80
Dehydration of ethanol produces
60 / 80
Consider the reaction represented by the following equation: H2(g) + 12(g) → 2HI(g). The number of effective collisions of molecules of the reactants decreases as
61 / 80
What is the value of x in the following equation? Cr2O72- + 14H+ + xe- → 2Cr3+ + 7H2O
62 / 80
Pipe-borne water is usually chlorinated in order to
63 / 80
An exothermic reaction is one which involves
64 / 80
Which of the following features of a human skeleton can be determined by carbon-dating?
65 / 80
When alkanols react with sodium, the ga evolved is
66 / 80
The property of calcium chloride which makes it useful as a drying agent is that it is
67 / 80
Which of the following can undergo both addition reactions and substitution reactions?
68 / 80
The liquid product of the destructive distillation of coal is
69 / 80
What is the function of sulphur (IV) oxide in the reaction represented by the following equation? SO 2(aq) + 2H2S(g) → 3S (s) + 2H 2O (l)
70 / 80
Which of the following procedures is suitable for identifying the food colouring added to a pastry sample?
71 / 80
Elactrostatic force of attraction between sodium ion and halide ion is greatest in
72 / 80
Which of the following will displace copper from a solution of copper (ll) salt?
73 / 80
What is the effect of using vanadium (V) oxide as catalyst in the reaction represented by the following equation? 2SO2 + O2 ⇌ 2SO3; ∆H = - xKJmol-1
74 / 80
The presence of unpaired electrons in an atom of a transition metal gives rise to
75 / 80
Gas molecules are said to be perfectly elastic because
76 / 80
Which of the following pairs of reagents recat to produce hydrogen?
77 / 80
Metals are said to be malleable because they
78 / 80
What is oxidized in the reaction represented by the following equation? 3CU + 8HNO3 → 3Cu(NO3)2 + 2NO + 4H2O
79 / 80
Which of the following would dissolve in warm dilute H2SO4 without effervescence, to give a blue solution?
80 / 80
Which of the following substances decomposes when an electric current is passed through it?
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