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Reaction of Metals with Water

If a substanc...

Question

If a substance X reacts with air to form an oxide Y that turns moist blue litmus red, then X is .

A

carbon

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B

magnesium

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C

sodium

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Solution

The correct option is A carbon
Y turns blue litmus red which implies Y is acidic in nature.

X + Oxygen (Air) → Y (Acidic oxide) This means that X is a non-metal.

Out of the given options, only carbon is a non-metal and would turn moist blue litmus red.

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