Which One Of The Following Is Pseudohalide?

An aqueous solution of a gas shows following reactions:  

(i) It turns red litmus blue

(ii) When added in excess to a copper sulphate solution a deep blue colour is obtained.

(iii) On addition to ferric chloride solution a brownish precipitate soluble in HNO₃ is obtained.       

Identify the gas.

Ammonium dichromate on heating gives

White silver surface turns black when O₃ is passed over it.   

This is due to the formation of

Reaction that involves atmospheric oxygen are never promoted by

The yellow colour often shown by nitric acid may be removed by

What is the name of the compound containing N, H and O, which on heating give laughing gas?

Which one of the following is best oxidizing agent? 

Mn⁺⁺ can be converted into Mn⁺⁷ by reacting with 

Oxidation state exhibited by sulphur is

How many bonding electron pairs are there in white phosphorus?