Hydrogen Test -...

The enthalpy change on freezing of 1 mol of water at $$5^oC$$ to ice at $$-5^oC$$ is:

Which of the following will give $${H}_{2}$$ gas with dilute $${HNO}_{3}$$?

Hydrogen does not combine with ______.

Industrially, $${ H }_{ 2 }{ O }_{ 2 }$$ is obtained by the following cyclic process :
$$\begin{matrix} 2-Ethylanthraquinol \\ (P) \end{matrix}\overset { { O }_{ 2 } }{ \underset { { H }_{ 2 }/Pd }{ \rightleftharpoons  }  } \begin{matrix} 2-Ethylanthraquinone \\ (Q) \end{matrix}+{ H }_{ 2 }{ O }_{ 2 }$$
Which one of the following properties is wrong about the mixture of organic solvents in which the reaction is carried out?

Volume strength of $$500ml$$ solution containing $$3.4gm$$ of $${H_2}{O_2}$$ is

A commercial  sample of $${H_2}{O_2}$$ marked as 100 volume hydrogen peroxide, it means that

Very pure hydrogen $$(99.9\%)$$ can be made by which of the following processes?

On shaking $$H_2O_2$$ with acidified potassium dichromate  and ether, etheral layer becomes?

When barium chloride solution is added to sodium sulphate solution, a white precipitate is formed. The white precipitate is:

$$H_2O_2$$ can be estimated by