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Question

Aqueous solution of which of the following salts turns the red litmus blue?

A
Na2CO3
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B
NaHCO3
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C
NaCO3.10H2O
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D
All of these
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Solution

The correct option is D All of these
Na2CO3,NaHCO3,Na2CO310H2O are basic in nature as H2CO3 is a weak acid and NaOH is a strong base.
NaOH+H2CO3NaHCO3(Basic)+H2O
NaHCO3+H2CO3Na2CO3(Basic)+H2O

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