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  3. Chemistry
  4. Water gas is mixed with steam and the mixture is passed over heated Fe2O3 in presence of Cr2O3. The mixture when passed in water dissolves CO2 and dihydrogen left undissolved is collected. This method of preparation of hydrogen gas is known as

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Q. Water gas is mixed with steam and the mixture is passed over heated $Fe_2O_3$ in presence of $Cr_2O_3$. The mixture when passed in water dissolves $CO_2$ and dihydrogen left undissolved is collected. This method of preparation of hydrogen gas is known as

Hydrogen

Solution:

For the commercial preparation of dihydrogen, Bosch process is used.
In Bosch's process, water gas (i.e. $CO + H _{2}$ ) is mixed with twice of its volume of steam in presence of catalysts $Fe _{2} O _{3}$ and $Cr _{2} O _{3}$ or $ThO _{2}$ where $Cr _{2} O _{3}$ acts as promoter. It gives the products $CO _{2}$ and $H _{2}$. Now, $CO _{2}$ is dissolved in water & removed leaving $H _{2}$ behind which is undissolved.