Which of the following elements forms a covalent electron-deficient hydride?

Dihydrogen reacts with dioxygen $(O_2)$ to form water. Write the name and formula of the product when the isotope of hydrogen which has one proton and one neutron in its nucleus is treated with oxygen. Will the reactivity of both the isotopes be the same towards oxygen? Justify your answer.

How do you expect the metallic hydrides to be useful for hydrogen storage? Explain.

Which of the following statements about $H_2SO_4$ is incorrect?

$A$ deuteron contains

In the manufacture of hydrogen from water gas $(CO + H_2)$,which of the following is the correct statement?