Question 63
Of the three metals X, Y and Z, X reacts with cold water, Y with hot water and Z with steam only. Identify X, Y and Z and also arrange them in order of increasing reactivity.

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Solution

X is an alkali metal, either Na or K, as alkali metals react with cold water.

Alkaline earth metals do not react with cold water, but only with hot water. So, Y is alkaline earth metal, either Mg or Ca.

And Fe and Zn do not react with cold water as well as hot water, but only with steam. Z can be Fe and Zn.

Therefore, the order for increasing reactivity is Na > Mg> Fe.

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Question 63
Of the three metals X, Y and Z, X reacts with cold water, Y with hot water and Z with steam only. Identify X, Y and Z and also arrange them in order of increasing reactivity.

Q. Of the three metals X, Y and Z, X reacts with cold water, Y with hot water and Z with steam only. Increasing order of reactivity with their identity is:

Three metals X, Y and Z are given. X reacts with cold water, hot water and steam. Y reacts with hot water and steam and Z reacts with steam only. Identify X, Y, and Z from the below options.

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.

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.

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