A certain metal will librate hydrogen from dilute acids. It will react withy water to form hydrogen only when the metal is heated and the the water is in the form of steam. The metal is probably

iron

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potassium

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copper

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mercury

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Solution

The correct option is A iron
Reaction:
$2 F e (s) + 6 H C l (a q) \to 2 F e C l_{3} (a q) + 3 H_{2} (g)$
Also,
$2 F e + 3 H_{2} O \to F e_{2} O_{3} + 3 H_{2}$

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Similar questions

Metal	Reactivity with
Metal	Water	Air	Dilute Acids
A	does not react	does not react	dilute acids
B	mild reaction with steam	develops coating of oxide if exposed to air	will react to form salt of acid and hydrogen
C	vigorous	vigorous	vigorous
D	can react	can react	will react to form salt of acid and hydrogen

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