Question

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

A
MgO
B
K2O
C
CO2
D
ZnO
E
H2O

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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