The metal which reacts with water only when it is red hot is:

Copper

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Iron

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Sodium

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Calcium

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Solution

The correct option is B
Iron

Iron reacts with water only when it is red hot and steam is passed over it.

3Fe + 4H2O(steam) →Fe3O4 + 4H2

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Similar questions

Q. From amongst the metals sodium, calcium, aluminium, copper, and magnesium, name the metal:
(i) which reacts with water only on boiling, and
(ii) another which does not react even with steam.

(a) Name a metal for each case:
(i) it does not react with cold as well as hot water but reacts with steam.
(ii) It does not react with any physical state of water.

(b) When calcium metal is added to water, the gas evolved does not catch fire but the same gas evolved on adding sodium metal to water catches fire. Why is it so?

Q. Give balanced reactions for the following: [4 MARKS]
(a) Sodium is dropped in water.
(b) Magnesium reacts with boiling water.
(c) Red hot iron reacts with steam.
(d) Iron reacts with dilute HCI.

Sodium reacts with cold water vigorously but iron only react with steam. It is because:

Q. Assertion :Copper is used to make hot water tanks and not steel (an alloy of iron). Reason: Copper does not react with cold water, hot water or steam. However, iron reacts with steam. If the hot water tanks are made of steel (an alloy of iron), then iron would react vigorously with the steam formed from hot water.

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The metal which reacts with water only when it is red hot is:

The correct option is B Iron Iron reacts with water only when it is red hot and steam is passed over it. 3Fe + 4H2O(steam) →Fe3O4 + 4H2

The correct option is B
Iron

Iron reacts with water only when it is red hot and steam is passed over it.

3Fe + 4H2O(steam) →Fe3O4 + 4H2