Identify the catalyst used in the following reaction at $500^{\circ} C$:
$CO + H_2O \rightleftharpoons CO_2 + H_2$

What is obtained by the reaction of $HCOOH$ with concentrated $H_2SO_4$?

Which of the following statements about hydrogen is incorrect?

Fire extinguishers contain

When $1:2$ equivalence ratio of the gases $X$ and $Y$ are heated to $573 \ K - 673 \ K$ at $200-300 \ atm$ in the presence of $ZnO-Cr_2O_3$ catalyst,methanol is formed. Here,the gases $X$ and $Y$ are $X$ and $Y$ respectively.

What are metallic or interstitial hydrides? How do they differ from molecular hydrides?