Q8 of 65 Page 18

The composition of aqua-regia is

Aqua-regia is a mixture of concentrated hydrochloric acid and concentrated nitric acid in the ratio of 3:1. Aqua-regia being a very strong acid dissolves gold in it.

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6

What happens when calcium is treated with water?

(i) It does not react with water


(ii) It reacts violently with water


(iii) It reacts less violently with water


(iv) Bubbles of hydrogen gas formed stick to the surface of calcium

 7

Generally metals react with acids to give salt and hydrogen gas. Which of the following acids does not give hydrogen gas on reacting with metals (except Mn and Mg)?

 9

Which of the following are not ionic compounds?

(i) KCl


(ii) HCl


(iii) CCl4


(iv) NaCl

 10

Which one of the following properties is not generally exhibited by ionic compounds?