$(i)$ A piece of aluminum foil is dropped in dil. hydrochloric acid in a test tube. On bringing a burning match stick near the mouth of the test tube, a pop sound occurs.
$(i i)$ A piece of aluminum foil is dropped in dil. sodium hydroxide in a test tube. On bringing a burning match stick near the mouth of the test tube, again a pop sound occurs.

The product formed in process $(i i)$ is :

A l C l_{3}

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N a C l

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N a A l O_{2}

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None of these

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Solution

The correct option is B $N a A l O_{2}$
In the reaction (ii) -

$2 A l (s) + 2 N a O H (a q) + 6 H_{2} O (l) ⟶ 2 N a^{+} [A l (O H)_{4}]^{-} (a q) + 3 H_{2} (g)$

or

$2 A l + 2 N a O H + 2 H_{2} O ⟶ 2 N a A l O_{2} + 3 H_{2}$
(Both reactions can occur)

So, the product formed in process (ii) is $N a A l O_{2}$

Thus, the correct option is $C$ .

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Similar questions

Q. Arun dropped aluminium foil in a test tube containing solution of sodium hydroxide. He observed bringing a burning matchstick near the mouth of the test tube the matchstick extinguishes with a pop sound. What do you think made the pop sound?

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^{'} X^{'}

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A student added acetic acid to test tubes I, II, III and IV containing the labeled substance and then brought a burning splinter near the mouth of each test tube.

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The correct option is B NaAlO2In the reaction (ii) -2Al(s)+2NaOH(aq)+6H2O(l)⟶2Na+[Al(OH)4]−(aq)+3H2(g)or2Al+2NaOH+2H2O⟶2NaAlO2+3H2(Both reactions can occur)So, the product formed in process (ii) is NaAlO2Thus, the correct option is C.