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Rohit, Raman, Rahul and Aman performed experiments of acetic acid with sodium carbonate (I), Sodium Hydroxide (II), Sodium hydrogen carbonate (III) and Sodium chloride (IV) separately. Each one brought burning candle near the mouth of the test tubes. The candle would not be extinguished near the mouth of which test tubes.

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An Intiative by Sri Chaitanya

(II) and (IV)

(I) and (III)

(II) and (III)

(III) and (IV)

answer is A.

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Detailed Solution

Only in the activity (II) and (IV) ${CO}_{2}$ gas is not evolving and the flame would not extinguish.

$I - {2CH}_{3} COOH (a q) + {Na}_{2} {CO}_{3} (s)$ $\to {2CH}_{3} COONa (a q) + H_{2} O (l) + {CO}_{2} (g) ↑$

$II - {CH}_{3} COOH (a q) + NaOH (a q) \to {CH}_{3} COONa (a q) + H_{2} O (l) + Heat$

$III - {CH}_{3} COOH (a q) + {NaHCO}_{3} (s) \to {CH}_{3} COONa (a q) + H_{2} O (l) + {CO}_{2} (g) ↑$

$IV - {CH}_{3} COOH (a q) + NaC l (a q) \to No reaction.$

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