The yellow colour often shown by nitric acid may be removed by
Bubbling the air through the warm acid
Dissolved oxides of nitrogen are removed.
Of the following acids of sulphur which one has more than one oxidation state of sulphur atom?
Of the following which compound is most unstable?
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
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?
Which one of the following is pseudohalide?
Mn++ can be converted into Mn+7 by reacting with