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To solublize nobel metals like gold, pla...

To solublize nobel metals like gold, platinum ..........mixture is used.

A

1:3 concentrated HCl and concentrated `HNO_3`

B

1:3 concentrated `HNO_3` and concentrated HCl

C

1:3 concentrated `HNO_3` and concentrated `H_2SO_4`

D

1: 3 concentrated `H_2SO_4` and concentrated HCl

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The correct Answer is:
B
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  2. Reaction of ammonia gas with excess of dichlorine gas produces ..........

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