Change of ${\mathrm{Na}}_2{\mathrm{CO}}_3.10{\mathrm{H}}_2\mathrm{O}$ to ${\mathrm{Na}}_2{\mathrm{CO}}_3.{\mathrm{H}}_2\mathrm{O}$ on exposure to air is called 

The structural formulae of compounds Q and R are shown below :

Which statement about compounds Q and R is correct? 

Consider the following reaction:

(I) and (II) are respectively

Moist sodium bicarbonate was placed on a strip of pH paper. The colour of the strip