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Ion Electron Method

Which of the ...

Question

Which of the following statements regarding nitrite ion (aq) solution is true?

A

It is oxidized by

H_{2} S

to sulphur.

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B

It turns

KI + Starch

solution deep blue in colour.

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C

It gives negative brown ring test.

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D

It is reduced by

Zn + NaOH

to ammonia gas

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Solution

The correct options are
B It is reduced by $Zn + NaOH$ to ammonia gas
D It turns $KI + Starch$ solution deep blue in colour.
Nitrate ion $⟶ N O_{2}^{-}$
$N O_{2}^{-} + (Z n + N a O H) ⟶ N H_{3} ↑ + H_{2} O$
Here $Z n; N a O H$ act as reducing agent.
Nitrate ion act as oxidising agent and oxide $K I +$ slach into blue colour.

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