A dilute solution of sodium carbonate was added to two test tubes - one containing dil HCl (a) and the other containing dilute NaOH (b).

The correct observation was :

A brown coloured gas liberated in test tube A

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A brown coloured gas liberated in test tube B

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A colourless gas liberated in test tube A

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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
$N a_{2} C O_{3} + 2 H C l \to 2 N a C l + H_{2} O + C O_{2}$

The colorless gas evolved is carbon dioxide. No reaction will happen in the other test tube.

So, the correct option is $C$

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Q. Identify the correct sequence of steps in an experiment to show the effect of temperature on the rate of the reaction.
(a) Measuring the volumes of

H_{2}

gas liberated in two test tubes.
(b) Heating the test tube B by

10^{\circ} C

.
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H_{2}

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

The correct option is C A colourless gas liberated in test tube ANa2CO3+2HCl→2NaCl+H2O+CO2The colorless gas evolved is carbon dioxide. No reaction will happen in the other test tube.So, the correct option is C

A dilute solution of sodium carbonate was added to two test tubes - one containing dil HCl (a) and the other containing dilute NaOH (b).

The correct observation was :

The correct option is C A colourless gas liberated in test tube A
$N a_{2} C O_{3} + 2 H C l \to 2 N a C l + H_{2} O + C O_{2}$

The colorless gas evolved is carbon dioxide. No reaction will happen in the other test tube.

So, the correct option is $C$