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Question

Complete the following reactions:
(a) Metal + dil. Acid Salt +
(b) Metal hydrogencarbonate + dil. Acid Salt ++ Water

A
Oxygen
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B
Nitrogen
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C
Carbon dioxide
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D
Hydrogen
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Solution

The correct options are
C Carbon dioxide
D Hydrogen
Metals which are more reactive than hydrogen displace it on reaction with a dilute acid. They form their respective salts and liberate hydrogen gas.
Metal + dil.Acid Salt + Hydrogen

Metal hydrogencarbonate with dilute acids undergoes double displacement reaction and forms products such as H2CO3 and salt of respective metal.
The rapid decomposition of carbonic acid releases CO2 and H2O
Metal hydrogencarbonate + dil.Acid Salt + Carbon dioxide + Water

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