Which one of the following properties has the same value for $H_2$ and $D_2$?

Which of the following statements is not correct?

State whether the following statements are True or False:
$(1)$ The metal and non-metal elements of $d$-block react with hydrogen to give molecular hydrides.
$(2)$ At normal temperature,dihydrogen reacts violently with dioxygen.

Hydrogen gas is prepared by using $C$ (coke) and steam in the presence of $Fe_2O_3/Cr_2O_3$. This process is known as:

In an ice crystal,each water molecule is hydrogen bonded to $.......$ neighbouring molecules.

Among the following,the correct statement is