Complete the reaction: $8LiH + Al_2Cl_6 \to ?$

In which of the following reactions,hydrogen is acting as an oxidising agent?

Which of the following is commonly used in a laboratory desiccator?

$H_2SO_4$ acts as a dehydrating agent in its reaction with:

Hydrogen has three isotopes $(A)$,$(B)$ and $(C)$. If the number of neutron$(s)$ in $(A)$,$(B)$ and $(C)$ respectively,are $(x)$,$(y)$ and $(z)$,the sum of $(x)$,$(y)$ and $(z)$ is:

When a mixture of methane and steam is passed over a nickel catalyst supported on alumina at $725\,^oC$,the product obtained is: