HALF-YEARLY TEST PAPER for Chapters 1 - 10

If a chemical equation has '+ heat' on its right-hand side, it is definitely:

Which of these soils absorbs and retains the maximum water?

In a compound ${\mathrm{XO}}_2$, the valency of $\mathrm{X}$ is

Which organ in the human body does both- digestion as well as absorption of digested food?

A thermos flask prevents loss of heat by

The chemical name of caustic soda is

The reaction $\mathrm{MN}+\mathrm{OP}\to \mathrm{MP}+\mathrm{ON}$ is a
 

It is very hot near the equator because