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If the mass of proton is doubled and that of neutron is halved, the molecular weight of ${CO}_{2}$ consisting of only $C^{12}$ and $O^{16}$ atoms, will:

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Correct option is B

The mass of proton is doubled and that of neutron is halved, the molecular weight of ${CO}_{2}$ consisting of only $C^{12}$ and $O^{16}$ atoms, will increased by 25%.

The molecular weight of ${CO}_{2}$ are 44.01 g/mol

No. of protons $= 6 + 16 = 22$

No. of neutrons $= 6 + 16 = 22$

New total mass $= 22 \times 2 + \frac{22}{2} = 55$

Increase in mass $= 11$

% Increase $= \frac{11}{44} \times 100 = 25 %$

Hence, the option B is correct

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If the mass of proton is doubled and that of neutron is halved, the molecular weight of CO2 consisting of only C12 and O16 atoms, will: