Q21 of 48 Page 9

Which of the following is used for dissolution of gold?

Aqua-regia is used for the dissolution of gold. It is a solution of concentrated HNO3 and concentrated HCl in the ratio of 1:3. Thus this solution is strongly acidic and is used to dissolve gold.


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19

Which of the following is acidic in nature?

 20

In an attempt to demonstrate electric conductivity through an electrolyte, the following apparatus (figure) was set up.



Which among the following statement(s) is/are correct?


(i) Bulb will not glow because electrolyte is not acidic.


(ii) Bulb will glow because NaOH is a strong base and furnishes ions for conduction.


(iii) Bulb will not glow because circuit is incomplete.


(iv) Bulb will not glow because it depends upon the type of electrolytic solution.

 22

Which of the following is not a mineral acid?

 23

Which among the following is not a base?