Answer All questions by clicking on the correct alternative. If you get wrong, try again before attempting another question.
Which one of the following metals reacts with water at ordinary temperature to give hydrogen?
A. Aluminium B. Calcium C. Zinc D. Iron
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An example of a gas which acts as an oxidizing agent is
A. Carbon dioxide B. Chlorine C. Sulphur dioxide D. Ammonia.
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The role of coke in the extraction of iron in the blast furnace is to A. Produce carbon monoxide, which reduces the oxides. B. Produce quick lime, which combines with silica. C. Combine with iron to form steel. D. Reduce excessive heat produced in the furnace.
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Which one of the following substances is produced during the electrolysis of brine? A. Sodium sulphate B. Sodium oxide C. Sodium peroxide D. Sodium hydroxide.
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Which one of the following salts is soluble in water? A. Lead carbonate B. Sodium carbonate C. Barium carbonate D. Calcium carbonate.
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Element M belongs to group III of the periodic table. The most likely formula of its oxide is
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Which one of the elements with the following atomic numbers reacts most vigorously with water? A. 2: 8: 1 B. 2: 8: 2 C. 2: 8: 8: 1 D. 2: 8: 8: 2
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The best reason for including water in the laboratory preparation of chlorine is to A. Remove chlorine gas. B. Cool chlorine gas C. Cool hydrogen chloride gas D. Remove hydrogen chloride gas.
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Which one of the following processes docs not release carbon dioxide? A. Combustion B. Respiration C. Photosynthesis D. Fermentation.
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Which one of the following compounds is used as a catalyst in the manufacture of sulphur trioxide? A. Alumina B. Vanadium (V) oxide C. Manganese (IV) oxide D. Iron powder.
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During the manufacture of sugar, which one of the following processes is used to remove the brown colour? A. Recrystallisation B. Filtration C. Evaporation D. Precipitation
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Which one of the following gases reduces hoi copper (II) oxide to copper? A. Carbon dioxide B. Carbon monoxide C. Nitrogen dioxide D. Nitrogen monoxide.
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A Catalyst is a substance which A. Controls the concentration of reactants. B. Stops a reaction from becoming violent C. Increases the rate of a chemical reaction D. Neutralizes a base.
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Which one of the following best explains why graphite and diamond differ? A. Graphite is impure carbon. B. Their densities are not the same C. All the four valency electrons of graphite are used in covalent bonding. D. Their atomic structures are different.
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When copper powder is shaken with aqueous silver nitrate the colour of the solution turns to A. Brown B. Colourless C. Blue D. Green.
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Dilute nitric acid reacts with copper to produce A. copper nitrate, water and nitrogen dioxide B. copper nitrate, water and nitrogen monoxide C. copper nitrate, water and ammonia D. copper nitrate, water and hydrogen.
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Which one of the following salts is soluble in water? A. lead chloride B. calcium sulphate C. sodium nitrate D. barium carbonate.
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Isotopes of an element have got A. Same number of protons and neutrons. B. Same number of electrons and neutrons. C. Different number of electrons and protons. D. Same number of electrons and protons.
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Which of the elements whose atomic numbers are given below gives an acidic oxide? A. 2 : 8 : 1 B. 2 : 8 : 3 C. 2: 8 : 6 D. 2: 8 : 8 : 2
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The product formed when silver nitrate is heated until there is no further change is A. Silver oxide, nitrogen dioxide and oxygen. B. Silver metal, nitrogen dioxide and oxygen. C. Silver metal and nitrogen dioxide D. Silver oxide and nitrogen dioxide.
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An acid accidentally spilled on a pupil's clothes is best neutralized by a solution of pH A. 1 B. 4 C. 5 D. 8
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25cm3 of a 0.25M acid required 25cm3 of 0.5M sodium hydroxide solution for neutralization. The basicity of the acid is A. I B. 2 C. 3 D. 4
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A white precipitate was formed when an aqueous solution of a salt was reacted with aqueous barium nitrate. The white precipitate dissolved in nitric acid. The acid anion in the salt is A. SO32- B. NO-3 C. SO42- D. Cl-
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An oxide of metal Q can he reduced by metal K. but not by metal. The order of the reactivity of these metals is A. Z, K, Q B. K, Z,Q C. Q, K,Z. D. K, Q, Z.
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Which of the following substances is used to catalyse the rate of decomposition of hydrogen peroxide? A. Copper (II) sulphate B. Manganese (IV) oxide C. Vanadium (V) oxide D. Finely divided iron.
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In which of the following processes does oxidation Not occur? A. Burning of biogas B. Rusting of iron C. Melting of candle wax D. Smouldering of phosphorus.
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Which one of the following properties of hydrogen is applied during its collection by upward delivery? A. It is slightly soluble in water. B. It is a gas with low boiling point B. It is less dense than air. D. It forms an explosive mixture with oxygen.
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Which one of the following carbonates decomposes when heated to give an alkaline colourless gas? A. Calcium carbonate B. Zinc carbonate C. Potassium carbonate D. Ammonium carbonate.
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A. 1 B. II C. Ill D. IV
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Which one of the following substances can be obtained by a process of hydrogenation of oil? A. Petroleum B. Margarine C. Soap D. Rubber.
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When copper (II) nitrate is strongly heated the gases evolved are A. oxygen and nitrogen B. oxygen and nitrogen dioxide C. nitrogen and ammonia D. ammonia and nitrogen dioxide.
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Which one of the following properties is Not that of paraffin? It is A. a solvent B. a fuel C. more dense than water. D. volatile.
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The product formed when a candle bums in excess air is A. carbon monoxide B. methane C. water vapour D. soot.
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Which one of the following metal oxides is reduced by carbon? A. Magnesium oxide B. Sodium oxide C. Calcium oxide D. Iron oxide.
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Lead and silver nitrates are frequently used as reagents because A. Other metals nitrates arc insoluble. B. Most nitrates of metal never decompose on heating C. Other salts of lead and silver arc insoluble. D. They are the most suitable.
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ASSERTION - REASON QUESTIONS Each of the questions 41 to 45 consists of an assertion (statement) on the left-hand side and a reason on the right-hand side Select:
A. if both the assertion and the reason are true statements and the reason is a correct explanation of the assertion. B. if both the assertion and the reason are true statements but the reason is not a correct explanation of the assertion. C. if the assertion is true but the reason is not a correct statement. D. if the assertion is not correct but the reason is a correct statement.
41. Wrought is made by heating pig iron with haemitite because haematite oxidises most of the impurity in pig iron to gaseous oxides.
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Hydrogen chloride gas conducts electricity when in solution because the gas consists of ions.
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Equal volumes of different gases at s.t.p contain the same number of molecules because gases are composed of tiny fast moving particles.
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Oxygen molecule is diatomic because it has high melting point.
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Permanent hardness of water is caused by the presence of magnesium and calcium ions in water because these elements form sulphate compounds.
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MULTIPLE - COMPLETION QUESTIONS In each of the questions 46 to 50, one or more of the answers given mat’ be correct. Read each question carefully and then indicate the correct answer according to the following:
A. If 1, 2 and 3 only are correct. B. If 1 and 3 only are correct. C. If 2 and 4 only are correct. D. If 4 only is correct.
46. Which one of the following substances reacts with heated lead(II) oxide? 1. Hydrogen gas 2. Copper metal 3. Carbon 4. Oxygen gas.
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The element with atomic number 7. 1. is a non-metal 2. has a relative atomic mass 7 3. forms acidic oxides 4. reads by loss of electrons. ..
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Which one of the following substances does not exhibit allotropy? 1. Carbon. 2. Sulphur 3. Phosphorus 4. Chlorine.
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During electrolysis of dilute hydrochloric acid using carbon electrodes. 1. oxygen is given off at the anode. 2. chlorine is given off at the anode. 3. hydrogen is given off at the cathode 4. the pH of the acid decreases.
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When Zinc metal is placed in a solution of copper (II) sulphate. 1. a brown solid is formed 2. a colourless gas is evolved 3. the solution fades in colour 4. no observable reaction is made.
