Chemistry Practice Questions

1. What is the most suitable way of investigating the different amino acids in a small mixture of amino acids?

A crystallizationB filtrationC fractional distillationD paper chromatography

2. A yellow solution X gives a brown precipitate with excess aqueous sodium hydroxide.

It gives a yellow precipitate with lead(II) nitrate.

Which ions does X contain?

A iron(III) and iodide ionsB iron(II) and chloride ionsC copper(II) and iodide ionsD zinc and chloride ions

3. A solid B is heated and it decomposes to form a metal oxide and a gas that gives a white precipitate with limewater. The metal oxide is yellow when hot and white when cold.

What is solid B?

A copper(II) carbonateB zinc nitrateC zinc carbonateD lead(II) carbonate

4. How many electrons are shared in the covalent bonding of a carbon dioxide molecule?

A 8B 10C 12D 14

5. Which compound has only covalent bonds?

A liquid ethanoic acidB sodium chlorideC copper(II) sulfateD sodium hydroxide

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6. The formula of nitrite ions is NO2-. What is the formula of sodium nitrite?

A NaNO2

B Na2NO2

C Na(NO2)2

D Na2(NO2)2

7. How many moles of acid are in 5 dm3 of 1 mol/dm3 HCl?

A 1B 2.5C 5D 10

8. Which of the following is an exothermic process?

A the combustion of carbon in airB melting of ice into waterC boiling of water into steamD dissolving ammonium chloride in water

9. Which of the following statements is true about speed of reaction?

A The more number of successful collisions, the faster the rate of reaction.B Changing the pressure of a reaction affects the speed of all reactions.C Increasing the surface area of the solid reactant decreases the speed of

reaction.D Decreasing the temperature of the reaction mixture increases the speed of

reaction.

10.The element with a proton number of 3 has similar chemical properties to the element with the proton number

A 7B 8C 11D 12

11.Which substance reacts with propane?

A waterB hydrochloric acidC acidified potassium dichromate(VI)D bromine

12. Which statement is true about ethanol?

A It has an empirical formula of CH2O.B It reacts with oxygen to form soot and water only.C It contains a –OH functional group.D It has a higher boiling point than sodium chloride.

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