Semi-water gas is a mixture of which of the following?

Which property of hydrogen distinguishes it from alkali metals?

Match List-$I$ (Fuels) with List-$II$ (Composition) and select the correct answer using the codes given below the lists.

List-$I$ (Fuels)	List-$II$ (Composition)
$A$. Water gas	$i$. $A$ mixture of $CO$ and $N_2$
$B$. Producer gas	$ii$. Methane
$C$. Coal gas	$iii$. $A$ mixture of $CO$ and $H_2$
$D$. Natural gas	$iv$. $A$ mixture of $CO$,$H_2$,$CH_4$ and $CO_2$

Choose the correct sequence for $A-B-C-D$ respectively:

Hydrogen has three isotopes $(A)$,$(B)$ and $(C)$. If the number of neutron$(s)$ in $(A)$,$(B)$ and $(C)$ respectively,are $(x)$,$(y)$ and $(z)$,the sum of $(x)$,$(y)$ and $(z)$ is:

Which of the following statements is not true?

Which one of the following methods is used to prepare carbon monoxide on a commercial scale?