Question

 

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.

Solution

Correct option is

NH3

 

The gas (X) is NH3.  

Its aqueous solution is NH4OH which turns red litmus to blue.

   

                                                                Tetrammine copper (II)

                                                                                          Sulphate (blue colour)     

  

                                                   Brownish ppt.  

                                                    Soluble

SIMILAR QUESTIONS

Q1

NaNO2 gives coloured fumes on treatment with dilute acids. The colour of fumes is

Q2

When NaNO3 is heated with (NH4)2SO4 a colourless gas & a residue is obtained. The colour of residue is

Q3

The strongest reducing agent amongst the following is

Q4

Which of the following is correct order of bond strength?

Q5

Of the following acids of sulphur which one has more than one oxidation state of sulphur atom?

Q6

Of the following which compound is most unstable?

Q7

Ammonium dichromate on heating gives

Q8

 

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

This is due to the formation of

Q9

Reaction that involves atmospheric oxygen are never promoted by

Q10

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