Give the chemical reaction for the preparation of producer gas.

What do you understand by the term "non-stoichiometric hydrides"? Do you expect this type of the hydrides to be formed by alkali metals? Justify your answer.

Name the classes of hydrides to which $H_2O$,$B_2H_6$ and $NaH$ belong.

In the water-gas shift reaction,hydrogen gas is produced from the reaction of steam with

Given below are two statements:
Statement $I$ : Nickel is being used as the catalyst for producing syn gas and edible fats.
Statement $II$ : Silicon forms both electron rich and electron deficient hydrides.
In the light of the above statements,choose the most appropriate answer from the options given below:

Observe the following reactions:
$I$. $CO_{(g)} + H_{2(g)} \xrightarrow{X} HCHO_{(g)}$
$II$. $CO_{(g)} + 3 H_{2(g)} \xrightarrow{Y} CH_{4(g)} + H_2O_{(g)}$
The catalysts $X$ and $Y$ in the above reactions are respectively: