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Question

A dilute solution of sodium carbonate was added to two test tubes - one containing dilute HCl (A) and the other containing dilute NaOH (B). The correct observation was


A

A brown coloured gas liberated in test tube A.

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B

A brown coloured gas liberated in test tube B.

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C

A colourless gas liberated in test tube A.

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D

A colourless gas liberated in test tube B.

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Solution

The correct option is C

A colourless gas liberated in test tube A.


Na2CO3(aq)+2HCl(aq)2NaCl(aq)+CO2 + H2O(l)
CO2 is a colourless and odourless gas.
Na2CO3+NaOHNo reaction
Na2CO3 is a basic salt and hence it reacts with HCl (strong acid) to form NaCl, whereas it undergoes no reaction when it reacts with a strong base like NaOH.


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