Complete the following reactions:
(a) Metal+dil.Acid→Salt+
(b) Metalhydrogencarbonate+dil.Acid→Salt++Water
A
Hydrogen
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B
Carbon dioxide
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C
Nitrogen
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D
Oxygen
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Solution
The correct option is B Carbon dioxide 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 Metalhydrogencarbonate+dil.Acid→Salt+Carbondioxide+Water