During the reaction of some metals with dilute hydrochloric acid, the following observations were ? made.? a.Silver does not show any change.? b.Some bubbles of gas are seen when lead reacted with acid? c.The reaction of sodium is found to behighlyexplosive Arrange the metals in the increasing order of reactivity and give reasons for the same

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Solution

Dear student,
Increasing order-
a.Silver does not show any change.< b.Some bubbles of gas are seen when lead reacted with acid < c. The reaction of sodium is found to be highly explosive
Reason- Na is 2nd top-most reactive element in the reactivity series. Hence, it shows the highest reactivity.
Pb is situated at the bottom of Na and hence shows mild reactivity with Some bubbles of gas.
Ag is the noble metal that is occupying the bottom most position in the reactivity series, hence shows no reaction with acids.
Regards.

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Question 31
During the reaction of some metals with dilute hydrochloric acid, following observations were made.

(a) Silver metal does not show any change.

(b) The temperature of the reaction mixture rises when aluminium (Al) is added.

(d) Some bubbles of a gas are seen when lead (Pb) is reacted with the acid.

Explain these observations giving suitable reasons.

During the reaction of some metals with dilute hydrochloric acid, the following observations were made.

The reaction of sodium metal is found to be highly explosive because:

Q. During the reaction of some metals with dilute hydrochloric acid, the following observations were made. The temperature of the reaction mixture rises when aluminium (Al) is added mainly because :

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.

Give reason for the following :

(a) Though lead is above hydrogen in the activity series, it does not react with dilute hydrochloric acid or dilute sulphuric acid.

(b) Potassium and sodium are not used fro reaction with dilute hydrochloric acid or dilute sulphuric acid in laboratory preparation of hydrogen.

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