Which of the following reactions shows the acidic character of nitric acid-C - 4HNO-3 - CO-2 - 2H-2O - 4 NO-2-K-2O - 2HNO-3 - 2KNO-3 - H-2O-S - 6HNO-3 - H-2SO-4 - 2H-2O - 6NO-2-ZnO - 2HNO-3 - Zn-NO-3-2 - H-2O-

The correct options are B K_2O + 2HNO_3 → 2KNO_3 + H_2O D ZnO + 2HNO_3 → Zn(NO_3)_2 + H_2O In the given options,K_2O and ZnO are basic oxides because they can ...

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Standard IX

Chemistry

Chemical Properties of Nitric Acid

Which of the ...

Question

Which of the following reactions shows the acidic character of nitric acid?

$C + 4 H N O_{3} \to C O_{2} + 2 H_{2} O + 4 N O_{2}$

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$K_{2} O + 2 H N O_{3} \to 2 K N O_{3} + H_{2} O$

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$S + 6 H N O_{3} \to H_{2} S O_{4} + 2 H_{2} O + 6 N O_{2}$

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$Z n O + 2 H N O_{3} \to Z n (N O_{3})_{2} + H_{2} O$

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Solution

The correct options are
B
$K_{2} O + 2 H N O_{3} \to 2 K N O_{3} + H_{2} O$

D
$Z n O + 2 H N O_{3} \to Z n (N O_{3})_{2} + H_{2} O$

In the given options, $K_{2} O$ and $Z n O$ are basic oxides because they can give $K O H$ and $Z n (O H)_{2}$ when dissolved in water. So they act like bases. $H N O_{3}$ being a strong acid readily forms salt and water in the reactions given below. Hence these reactions prove the acidic nature of nitric acid.

$K_{2} O + 2 H N O_{3} \to 2 K N O_{3} + H_{2} O$
$Z n O + 2 H N O_{3} \to Z n (N O_{3})_{2} + 2 H_{2} O$

In the other two reactions, it shows the oxidising property of the acid.

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