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

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Solution

When metals reacts with water(Hot, cold or steam), they displace hydrogen from the water and Hydrogen gas is released. Metals react with water according to their reactivities. Only those metals react with water, which are above hydrogen in the reactivity series.

(a) Out of given metals, only magnesium reacts with hot boling water and forms magnesium hydroxide and hydrogen gas.

(b) Out of all the given metals only copper is less reactive than hydrogen, so it cannot displace hydrogen from the water even if the temperature is so high. That's why copper does not react even with the steam.

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Similar questions

Q. From the metals-copper, iron, magnesium, sodium and zinc-select a different metal in each case which :
(a) does not react with dilute hydrochloric acid.
(b) can form 2⁺ and 3⁺ ions.
(c) has a hydroxide that reacts with both acids and alkalis.
(d) does not react with cold water, but reacts with steam when heated.

From the metals: copper, iron,magnesium, sodium, and zinc, select a different metal in each case which:

(a) does not react with dilute hydrochloric acid,

(b) can form $2^{+}$ and $3^{+}$ ions,

(d) does not react with cold water but reacts with steam when heated.

(e) Arrange the above metals in their decreasing order of reactivity.

From the metals copper, iron, magnesium, sodium and zinc, select a different metal in each case which:
(i) does not react with dilute hydrochloric acid.
(ii) can form 2+ and 3+ ions.
(iii) has a hydroxide that reacts with both acids and alkalis.
(iv) does not react with cold water but reacts with steam when heated.
Arrange the metals in increasing order of reactivity.

Q. Name the following: A metal which does not react with cold water but reacts with steam.

Q. Question 7
Metals generally react with dilute acids to produce hydrogen gas. Which one of the following metals does not react with dilute hydrochloric acid?

(a) magnesium
(b) aluminium
(c) iron
(d) copper

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

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