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  • <img alt="\mathrm{Na}_{2} \mathrm{CO}_{3}+\mathrm{H}_{2} \mathrm{O}+\mathrm{CO}_{2} \rightarrow \text{White crystalline powder (A)}" src="https://entrancecorner.oncodecogs.com/gif.latex?%5Cmathrm%7

\mathrm{Na}_{2} \mathrm{CO}_{3}+\mathrm{H}_{2} \mathrm{O}+\mathrm{CO}_{2} \rightarrow \text{White crystalline powder (A)}

Compound (\mathrm{A}) on reaction with phenolphthalein gives

Option: 1

No colour


Option: 2

Yellow colour


Option: 3

Orange colour


Option: 4

 Pink colour


Answers (1)

best_answer

\mathrm{Na}_{2} \mathrm{CO}_{3}+\mathrm{H}_{2} \mathrm{O}+\mathrm{CO}_{2} \rightarrow 2 \mathrm{NaHCO}_{3}
Phenolphthalein is naturally colourless and it turns in pink colour in an alkaline solution or base.

\mathrm{NaHCO}_{3} on reaction with phenolphthalin gives pink colour due to basice nature if \mathrm{NaHCO}_{3}.

Posted by

Devendra Khairwa

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