Study the table below and answer the questions that follow.

Metal	Reactivity with
	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

(a) Which of these elements will react with cold water to form hydrogen gas?
(b) Which of these will rust?
(c) Which is an unreactive metal?
(d) Arrange the metals shown above in the order of decreasing 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,

(c) has a hydroxide that reacts with both acids and alkalis,

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

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

Question 24.
Which of the following statements is not correct ?

(a) All metal carbonates react with acid to give a salt, water and carbon dioxide
(b) All metal oxides react with water to give salt and acid
(c) Some metals react with acids to give salt and hydrogen
(d) Some non-metal oxides react with water to form an acid

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.