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Question

Which of the following oxides can dissolve in water to form a solution that would turn litmus indicator red in colour? 


A
MgO
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B
K2O
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C
CO2
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D
ZnO
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E
H2O
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Solution

The correct option is C $$\displaystyle { CO }_{ 2 }$$
Litmus paper is used to test whether the given solution is acidic or alkaline in nature. Litmus paper is a natural indicator. Indicators are red in acids and blue in bases. In other words, acids change blue litmus paper to red; bases change red litmus paper to blue. $$MgO,\ K_2O$$ and $$ZnO$$ are basic oxides while $$CO_2$$ is the acidic oxide. 
So, the given acidic oxide of carbon, i.e., carbon dioxide turns blue litmus red.

Chemistry

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