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Positional Isomerism

A gas X is pa...

Question

A gas X is passed through water to form a saturated solution. The aqueous solution on treatment with silver nitrate gives a white precipitate. The saturated aqueous solution also dissolves magnesium ribbon with evolution of a colourless gas Y. Identify X and Y :

A

X =

{C O}_{2}

, Y =

{C l}_{2}

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B

X =

{C l}_{2}

, Y =

{C O}_{2}

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C

X =

{C l}_{2}

, Y =

H_{2}

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D

X =

H_{2}

, Y =

{C l}_{2}

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Solution

The correct option is B X = ${C l}_{2}$ , Y = $H_{2}$
The gas X is chlorine and the gas Y is hydrogen.
Chlorine dissolves in water to form HCl and oxygen.
$C l_{2} + H_{2} O \to H C l + H O C l$
$2 H O C l \to 2 H C l + O_{2}$
Silver nitrate reacts with chlorine water to form white precipitate of silver chloride.
$A g N O_{3} + H C l + \to A g C l ↓ (w h i t e) + H N O_{3}$
Chlorine water also reacts with magnesium to form magnesium chloride alongwith evolution of hydrogen.
$M g + 2 H C l \to M g C l_{2} + H_{2}$

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