The addition of dilute $H C l$ to unknown metal produced a transparent gas. What is the likely identity of this gas?

C l_{2}

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H_{2}

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O_{2}

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C O_{2}

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N O_{2}

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Solution

The correct option is B $H_{2}$
Metals that come before hydrogen in the reactivity series form their corresponding chlorides when heated with HCl and liberate hydrogen gas.
Eg:
$C a + 2 H C l \to {C a C l}_{2} + H_{2}$

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Similar questions

H N O_{3}

	Appearance	Reactions with dilute $H C l$	Reaction with dilute $H N O_{3}$
Unknown metal #1	Dull gray solid with white oxide coating	Dissolved with bubbles of clear gas	Dissolved with bubbles of clear gas
Unknown metal #2	Solid; lustrous, smooth silver-gray surface	No Reaction	Dissolved with bubbles of orange gas

H N O_{3}

2

	Appearance	Reactions with dilute $H C l$	Reaction with Dilute $H N O_{3}$
Unknown metal 1	Dull grey solid with white oxide coating	Dissolved with bubbles of clear gas	Dissolved with bubbles of clear gas
Unknown metal 2	Solid, lustrous, smooth silver-grey surface	No reaction	Dissolved with bubbles of orange gas

H C l

Unknown metal	Appearance	Reactions with dilute HCl	Reaction with dilute HNO $_{3}$
(1)	Dull gray solid with white oxide coating	Dissolved with bubbles of clear gas	Dissolved with bubbles of clear gas
(2)	Solid; lustrous smooth silver-gray surface	No reaction	Dissolved with bubbles of orange gas

H N O_{3}

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