Question

on heating Zinc granules with conc. HNO3, a brown gas is evolved which undergoes dimerisation on cooling. Identify the gas.

Answer 1

Nitrogen dioxide is evolved when Zinc granules are heated with concentrated $HNO_3.$.

Explanation:

• When Zinc granules are reacted with concentrated $HNO_3$ it gets decomposed and forms Nitric Acid as the product and Nitrogen dioxide and water as by-products.

• This Nitric acid $NO_2$ is a brown coloured gas will be evolved from the reaction after it gets processed.

• This gas when undergoes dimerization it gets multiplied twice and becomes two moles or four or six or eight moles of Nitrogen dioxide.

• The reaction is:

      $Zn + 4HNO_3 \rightarrow Zn(NO_3)_2 + 2NO_2 + 2H_2O$  (in   presence of heat).

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