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
Which of the following represents unknown metal (1) ?

Mercury

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Copper

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Zinc

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Iron

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Silver

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Solution

The correct option is C Zinc
Unknown metal (1) could be zinc as it is dull gray solid with white oxide coating.
Note: Mercury is a liquid, copper is brownish, iron has orange brown coating of oxide (rust) and silver has gray-black colour.

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Similar questions

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

_{3}

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

	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	Reaction 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

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