Q22 of 44 Page 324

Give reasons:

Conc. HNO3 can be transported in aluminium container.

Concentrated HNO3 can be stored and transported in aluminium containers as it reacts with aluminium to form a thin protective oxide layer on the aluminium surface. This oxide layer renders aluminium passive.


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20

What happens when

(a) Borax is heated strongly,


(b) Boric acid is added to water,


(c) Aluminium is treated with dilute NaOH,


(d) BF3 is reacted with ammonia?

 21

Explain the following reactions

(a) Silicon is heated with methyl chloride at high temperature in the presence of copper;


(b) Silicon dioxide is treated with hydrogen fluoride;


(c) CO is heated with ZnO;


(d) Hydrated alumina is treated with aqueous NaOH solution.

 22

Give reasons:

A mixture of dilute NaOH and aluminium pieces is used to open drain.

 22

Give reasons:

Graphite is used as lubricant.