The reaction of $H_2S$ with $O_2$ produces .....

With which of the following does hydrogen combine directly?

The natural relative abundance of isotopes of hydrogen is:

Given below are two statements :
Statement-$I$: Methane and steam passed over a heated $Ni$ catalyst produces hydrogen gas.
Statement-$II$: Sodium nitrite reacts with $NH_4Cl$ to give $H_2O$,$N_2$ and $NaCl$.
In the light of the above statements,choose the most appropriate answer from the options given below :

$BeCl_2 + LiAlH_4 \to X + LiCl + AlCl_3$
Total number of $3c-4e^\Theta$ bonds present in the monomer form of compound $(X)$ is:

Which of the following substances can be used for drying gases?