Which of the following fuels has the maximum calorific value per gram?

The single largest industrial application of dihydrogen is:

If an isotope of hydrogen has two neutrons in its atom,its atomic number and atomic mass number will respectively be

The oxide which is not reduced by hydrogen is

Which of the following statements is not correct?

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 :