Categories Exams Past Questions (Senior Classes) CHEMISTRY PAST QUESTIONS Post author By Acadlly Chemistry 0% 158 SSCE/NECO/GCE (CHEMISTRY PAST QUESTIONS) CHEMISTRY PAST QUESTIONS Attempt all 60 questions that are selected from the Chemistry question bank. Use the NEXT, PREV, CLEAR and FINISH buttons to navigate around the CBT.You have 1 hour to answer all 60 questions. Goodluck 1 / 60 Category: CHEMISTRY PAST QUESTIONS The type of chemical bond that exists between potassium and oxygen in potassium oxide is dative ionic metallic covalent 2 / 60 Category: CHEMISTRY PAST QUESTIONS Electrovalent compounds are characterized by high melting point high molar mass solubility in ethanol strong oxidizing ability 3 / 60 Category: CHEMISTRY PAST QUESTIONS Which of the following pairs of reagents recat to produce hydrogen? Water and calcium dicarbide Copper and dilute hydrochloric acid Magnesium and dilute tetraoxosulphate (VI) acid Zinc and concentrated trioxonitrate (V) acid 4 / 60 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] 0.896dm 3 8.62dm 3 0.040dm 3 5.82dm 3 5 / 60 Category: CHEMISTRY PAST QUESTIONS Pipe-borne water is usually chlorinated in order to improve the teste of the water kill harmful bacteria in the water coagulate sediments in the water remove the hardness in the water clear 6 / 60 Category: CHEMISTRY PAST QUESTIONS The crystal layers in graphite are held together by van der Waals' forces covalent bonds hydrogen bonds electrostatic forces 7 / 60 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 25cm cube 50cm cube 30cm cube 8 / 60 Category: CHEMISTRY PAST QUESTIONS Pauli Exclusion Principle is related to collision theory of reaction rates quantum numbers of electrons reversiblility of equlibrium reactions electronegativity values of elements 9 / 60 Category: CHEMISTRY PAST QUESTIONS What does ∆H represent in the following equation ? Cl(g) + e- → CI- (g); ∆H = - 363 kJ mol-1 Electron affinity Dissociation energy lonization energy Heat of atomization 10 / 60 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 and ll only l only l, ll and lll only l, ll, lll, and IV 11 / 60 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? OH- H+ Cu2+ CI- 12 / 60 Category: CHEMISTRY PAST QUESTIONS Which of the following features of a human skeleton can be determined by carbon-dating? Mass Age Race Height 13 / 60 Category: CHEMISTRY PAST QUESTIONS Elements which belong to the same group in the Periodic Table are characterized by presence of the same number of electron shells in the respective atoms difference of 14 atomic mass units between successive members difference of +1 in the oxidation numbers of successive members presence of the same number of outermost electrons in the respective atoms 14 / 60 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 blue colour of the solution fades gradually The cathode becomes coated with copper The anode increases in mass 15 / 60 Category: CHEMISTRY PAST QUESTIONS Rusting of iron is an example of redox reaction deliquescence decomposition displacement reaction 16 / 60 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] 101 122 40 53 17 / 60 Category: CHEMISTRY PAST QUESTIONS Which of the following compounds dissolves in water to give an alkaline solution? Sodium chloride Potassium oxide Ammonium chloride Sulphur (IV) oxide 18 / 60 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 Graham's law Dalton's law Boyle's law Gay-Lussac's Law 19 / 60 Category: CHEMISTRY PAST QUESTIONS What type of reaction is involved when wood shavings produce a brown gas with concentrated HNO3? Dehydration Destructive distillation Nutralization Redox reaction 20 / 60 Category: CHEMISTRY PAST QUESTIONS What is oxidized in the reaction represented by the following equation? 3CU + 8HNO3 → 3Cu(NO3)2 + 2NO + 4H2O Copper Oxygen Hydrogen Nitrogen 21 / 60 Category: CHEMISTRY PAST QUESTIONS Which of the orbitals 4s, 4p, 4d and 4f has the lowest energy? 4d 4p 4s 4f 22 / 60 Category: CHEMISTRY PAST QUESTIONS Which of the following will displace copper from a solution of copper (ll) salt? Magnesium Zinc ions Aluminium ions Silver 23 / 60 Category: CHEMISTRY PAST QUESTIONS Dehydration of ethanol produces ethanoic acid ethanal propan-1,2,3-triol ethene 24 / 60 Category: CHEMISTRY PAST QUESTIONS Which of the following will produce oxygen and hydrogen during its electrolysis using platinum electrode? Concentrated hydrochloric acid Aqueous copper (ll) tetraoxosulphate (IV) Dilute sodium chloride solution Glucose solution 25 / 60 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] 0.635g 6.35g 18g 0.318g 26 / 60 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 27 / 60 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 Bleaching agent Oxidising agent Dehydrating agent 28 / 60 Category: CHEMISTRY PAST QUESTIONS Which of the following can undergo both addition reactions and substitution reactions? Benzene Propene Hexane Pentane 29 / 60 Category: CHEMISTRY PAST QUESTIONS It can be concluded that gastric juice contains enzymes is acidic is a mixture has pH value of 7 30 / 60 Category: CHEMISTRY PAST QUESTIONS If the solubility of KHCO3 is 0.40 mole dm-3 10.0g 4.0g 100.0g 40.0g 31 / 60 Category: CHEMISTRY PAST QUESTIONS Exhaust fumes discharged from a smoky vehicle gradually become invisible as a result of emission diffusion combustion absorption 32 / 60 Category: CHEMISTRY PAST QUESTIONS When alkanols react with sodium, the ga evolved is methane oxygen ethyne hydrogen 33 / 60 Category: CHEMISTRY PAST QUESTIONS Which of the following movements can be described as random motion? planets going round the sun gas molecules colliding in a flask wheelbarrow being pushed car travelling on a straight line 34 / 60 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 different chemical properties protective oxide coating higher molar mass 35 / 60 Category: CHEMISTRY PAST QUESTIONS Which of the following lowers the activation energy of a chemical reaction? Water Freezing mixture Reducing agent Catalyst 36 / 60 Category: CHEMISTRY PAST QUESTIONS Calcium atom ionizes by gaining two protons losing two electrons sharing two electrons gaining two electrons 37 / 60 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+ R + P+ → P + R+ Q + S+ → S + Q+ S + P+ → P + S + 38 / 60 Category: CHEMISTRY PAST QUESTIONS Which of the following contains co-ordinate covalent bond? CH4 Na+CI HCI NH4 39 / 60 Category: CHEMISTRY PAST QUESTIONS A mixture of calcium chloride and calcium trioxocarbonate (IV) in water can be separated by filtration sublimation evaporation distillation 40 / 60 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 41 / 60 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 the reaction is endothermic and occurs at high temperature activation energy is high and a catalyst is required a solid is formed and heat is evolved 42 / 60 Category: CHEMISTRY PAST QUESTIONS Chemical equilibrium is attained when concentrations of the reactants and products remain constant concentrations of the products are greater than those of the reactants reactants stop forming the products reactants in the system are used up 43 / 60 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 the volume of the system is increased the temperature is raised a catalysty is intoduced into the system the pressure increased 44 / 60 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) the reaction will go to completion the forward reaction will be favoured Activation energy will decrease the concentration of ammonia will increase 45 / 60 Category: CHEMISTRY PAST QUESTIONS In the Periodic Table, the elements that loss electrons most readily belong to Group 1 A Group 11 A Group 111 A Group V11 A 46 / 60 Category: CHEMISTRY PAST QUESTIONS Petrol consists mainly of alkanoates hydrocarbons polymers alktanols 47 / 60 Category: CHEMISTRY PAST QUESTIONS The atoms of four elements are represented as 20Q, 16R, 10S and 8T Which of the elements would be unreactive? R T S Q 48 / 60 Category: CHEMISTRY PAST QUESTIONS What is the value of x in the following equation? Cr2O72- + 14H+ + xe- → 2Cr3+ + 7H2O 1 6 12 8 49 / 60 Category: CHEMISTRY PAST QUESTIONS Which of the following is not correct about oxidation number convention? The oxidation number of a/an monatomic ion is equal to its charge element in the free state is zero alkali meta like sodium in its compounds is + 1 atom of a diatomic molecules is + 2 50 / 60 Category: CHEMISTRY PAST QUESTIONS Metals are said to be malleable because they can be alloyed are good conductors of electricity can be beaten into sheets are good conductors heat 51 / 60 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 alpha particles and gamma rays alpha and beta particles alpha particles only beta particles and gamma rays 52 / 60 Category: CHEMISTRY PAST QUESTIONS Chlorine atom forms CI by Sharing one electron Losing one electron Donating lone pair of electrons Gaining one electron 53 / 60 Category: CHEMISTRY PAST QUESTIONS Which of the following increases as boiling water changes to steam? temperature of the system activation energy degree of disorder in the system number of molecules 54 / 60 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 Reduces the time for attainment of equilibrium Shifts equilibrium position to the right Increases the collision rate of reactant particles Decreases the value of ∆H 55 / 60 Category: CHEMISTRY PAST QUESTIONS What is the oxidation number of nitrogen in AI(NO3)3? + 5 + 6 + 1 + 3 56 / 60 Category: CHEMISTRY PAST QUESTIONS Which of the following compounds dissolves in water to form a solution with pH below 7? Ammonium chloride Potassium hydroxide Sodium trioxocarbonate (IV) Sodium tetraoxosulphate (VI) 57 / 60 Category: CHEMISTRY PAST QUESTIONS Which of the following non-metals reacts most readily with metals? Sulphur Chlorine Nitrogen Carbon 58 / 60 Category: CHEMISTRY PAST QUESTIONS Which of the following occurs when a solution of CuSO4 is electrolysed using copper electrodes? The blue colour of the solution fades gradually Both electrodes gain electrons The anode increases in mass The cathode becomes coated with copper 59 / 60 Category: CHEMISTRY PAST QUESTIONS Substances which absorb water from the atmosphere without dissolving in it are said to be insolube hydrated anhydrous hygroscopic 60 / 60 Category: CHEMISTRY PAST QUESTIONS Which of the following properties increases down a group in the Periodic Table? Atomic radius Ionization energy Electon affinity Electronegativity Your score is LinkedIn Facebook Twitter VKontakte 0% Restart quiz Send feedback Students also read english language past questions financial accounting Commerce Past Questions Share on Social Media x facebook linkedinwhatsappFollow us on Social Media x facebook instagram youtubegoogle playTop 10 Affordable or Tuition-Free Universities in the USA Top Universities and IELTS-Free Scholarships Free Tuition: Study at German Universities Companies Sponsoring Work Visas in Canada 2024 Master’s Scholarships in the UK without IELTS Top 25 Master’s Scholarships Without IELTS or TOEFL Top 15 USA Scholarships Offering $50,000+ Related posts: FINANCIAL ACCOUNTING PAST QUESTIONS (SSCE) MATHEMATICS PAST QUESTIONS PHYSICS PAST QUESTIONS GEOGRAPHY PAST QUESTIONS Tags Chemistry, Past Questions (SSS) ← HUMAN RIGHTS → DATA PROCESSING Leave a Reply Cancel replyYour email address will not be published. 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