Question

 

A certain salt (X) gives the following tests:  

(i) Its aqueous solution is alkaline to litmus.

(ii) On strongly heating it swells to give a glassy bead

(iii) When concentrated sulphuric acid is added to a hot concentrated solution of (X), crystals of H3BO3 separate out.

Identify the colour of these crystals. 

Solution

Correct option is

White

 

(X) is borax, Na2B4O7.10H2O   

                                         (strong base)     (weak acid)

Due to presence of NaOH, the aqueous solution is alkaline to litmus.   

   

                                                                                                                        Glassy bead                                                                                           

(iii)   

                                                                               White crystals

SIMILAR QUESTIONS

Q1

 

  

How can this reaction is made to proceed in forward direction?

Q2

Borax is used as a cleansing agent because on dissolving in water, it gives:

Q3

Which of the following halides is least stable and has doubtful existence?