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Question

Which of the following oxides when dissolved in water gives a solution which turns blue litmus red?
  1. MgO
  2. CaO
  3. CO2
  4. CuO

A
MgO
B
CaO
C
CuO
D
CO2
Solution
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CO2+H2OH2CO3
Carbonic acid is acidic in nature so it turne blue litmus red.

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