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Metals

During the re...

Question

During the reaction of a meta with hydrochloric acid following observation was made: the temperature of the reaction mixture rises when aluminium is added. Explain teh observation giving suitable reason.

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Solution

Aluminium reacts with HCl to form aluminium chloride which is an exothermic reaction. Therefore the temperature of the reactions mixture rises.

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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 :

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.

(c) The reaction of sodium metal is found to be highly explosive.

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

Explain these observations giving suitable reasons.

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{[C o (H_{2} O)_{5}]}_{2}^{3 +} (p i n k) (a q) + 4 C l^{-} (a q) ⇌ [C o C l_{4}]^{2 -} (b l u e) (a q) + 6 H_{2} O (l)

Q. Question 37
Iqbal treated a lustrous, divalent element M with sodium hydroxide. He observed the formation of bubbles in the reaction mixture. He made the same observations when this element was treated with hydrochloric acid. Suggest how can he identify the produced gas. Write chemical equations for both the reactions.

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