Consider the experimental set-up in the picture.

           

            A colourless gas is given out when water is dropped to the mixture. Which of the    following statements is correct?

• A. Oxalic acid ionizes in water to give hydrogen ions.

•        B. Zinc ionizes in water to give zinc ions.

     

•          C. Water reacts with oxalic acid to give the colourless gas.

          

•     D. Water reacts with zinc to give hydrogen gas.

Which of the following statements about potassium hydroxide solution is INCORRECT?

• A. When potassium hydroxide solution is added to iron(II) sulphate solution, a dirty                          green precipitate is formed.

• B.        When potassium hydroxide solution is heated with ammonium chloride solution,                            ammonia gas is liberated.

• C. When a small amount of potassium hydroxide is added to zinc sulphate solution, a white precipitate forms and redissolve.

• D.        Concentrated potassium hydroxide solution is corrosive.

In which of the following processes would a colourless gas evolve?

            (1)       Magnesium is added to dilute sulphuric acid.

            (2)       Ammonium chloride is heated with calcium hydroxide.

            (3)       water is added to a solid mixture of citric acid and sodium hydrogencarbonate.

           

• A. (1) and (2) only

•      B. (1) and (3) only

• C. (2) and (3) only

• D. (1), (2) and (3)

A salt is a mixture of (NH₄)₂SO₄ and hydrated FeSO₄. Which of the following is/are the        expected observation(s) when an aqueous solution of this salt is treated with aqueous          sodium hydroxide solution?

 

            (1)       Formation of a dirty green precipitate

            (2)       Formation of a brown precipitate

            (3)       evolution of a gas with a pungent odour

• A. (1) only

• B. (2) only

•    C. (1) and (3) only

•    D. (2) and (3) only

• A

• B

• C

• D

Read the picture, choose the best answer.

• A

• B

• C

• D

The basicity of an acid is

• A. a value to express the concentration of the acid.

• B. the number of hydrogen atoms in one acid molecule.

• C. the number of moles of any base which can completely react with one mole of the acid.

• D.the number of hydrogen ions which can be produced by complete ionisation of one acid molecule.

Read the picture, choose the best answer.

• A

• B

• C

• D

Which of the following compounds has the highest basicity?

• A. HCl

• B. HCOOH

• C. H₂SO₄

• D. CH₃COOH

Which of the following solutions does NOT react with sodium hydroxide solution?

• A. ammonium chloride solution

• B. potassium carbonate solution

• C. copper(II) nitrate solution

• D. zinc sulphate solution