i. ………….. is obtained by the reduction of its oxide by carbon. (a) Zinc (b) Aluminium (c) Sodium (d) Potassium

Question

Rewrite the following statements by selecting the correct options:

i. ………….. is obtained by the reduction of its oxide by carbon. 

(a) Zinc 

(b) Aluminium 

(c) Sodium 

(d) Potassium

ii. ………….. is used as an anode during the electrolytic reduction of bauxite.

(a) Sulphur 

(b) Graphite 

(c) Platinum 

(d) Aluminium

iii. Silver gets corroded due to ………… in air. 

(a) oxygen 

(b) hydrogen sulphide 

(c) carbon dioxide 

(d) nitrogen

iv. …………. is the hardest substance and has the highest melting and boiling points.

(a) Iodine 

(b) Sulphur 

(c) Diamond 

(d) Phosphorus

v. Jewellery articles are gold plated …………. 

(a) to prevent corrosion 

(b) to prevent rusting of the base metal 

(c) to make articles attractive 

(d) all of these

vi. To show that zinc is more reactive than copper, the correct procedure is to ………..

(a) prepare copper sulphate solution and dip a zinc strip in it

(b) prepare zinc sulphate solution and dip a copper strip in it 

(c) heat together zinc and copper strips 

(d) add dil. nitric acid to both the strips

vii. Iron is ……… 

(a) more reactive than zinc 

(b) more reactive than aluminuium 

(c) less reactive than copper 

(d) less reactive than aluminium

viii. A solution of Al₂(SO₄)₃ in water is …………

(a) blue 

(b) pink 

(c) green 

(d) colourless

ix. A solution of ………… in water is blue in colour.

(a) CuSO₄

(b) FeSO₄

(c) ZnSO₄

(d) Al₂(SO₄)₃

x. A solution of …………. n water is green in colour.

(a) CuSO₄

(b) FeSO₄

(c) ZnSO₄

(d) Al₂(SO₄)₃

Answer 1

i. Zinc is obtained by the reduction of its oxide by carbon.

ii. Graphite is used as an anode during the electrolytic reduction of bauxite.

iii. Silver gets corroded due to hydrogen sulphide in air.

iv. Diamond is the hardest substance and has the highest melting and boiling points.

v. (d) all of these

vi. To show that zinc is more reactive than copper, the correct procedure is to prepare copper sulphate solution and dip a zinc strip in it.

vii. Iron is less reactive than aluminium.

viii. A solution of Al₂(SO₄)₃ in water is colourless.

ix. A solution of CuSO₄ in water is blue in colour.

x. A solution of FeSO₄ in water is green in colour.