Science
Electrolysis of water is a decomposition reaction. The mass ratio (MH : MO) of hydrogen and oxygen gases liberated at the electrodes during electrolysis of water is :
options
- 8 : 1
- 2 : 1
- 1 : 2
- 1 : 8
Electrolysis
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Answer
1 : 8
Reason — Electrolysis of water is a decomposition reaction, because water (H2O) breaks down into its constituent elements—hydrogen and oxygen—when an electric current passes through it.
During the process, hydrogen gas is released at the cathode and oxygen gas is released at the anode.
According to the chemical equation
2H2O → 2H2 + O2
the ratio of the number of molecules (or volumes) of hydrogen to oxygen formed is 2 : 1.
However, since the molecular mass of hydrogen (H2) is 2 and that of oxygen (O2) is 32, the mass ratio of hydrogen to oxygen becomes (2 × 2) : (1 x 32) = 4 : 32 = 1 : 8.
Hence, the mass ratio (MH : MO) of hydrogen and oxygen gases liberated during the electrolysis of water is 1 : 8.
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options
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options
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options
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