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Atoms consists of protons, neutrons and electrons. If the mass of neutrons and electrons were made half and two times respectively to their actual masses, then the atomic mass of $_{6} C^{12}$

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Will remain approximately the same

Will become approximately two times

Will remain approximately half

Will be reduced by 25%

answer is D.

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Detailed Solution

No change by doubling mass of electrons however by reducing mass of neutron to half total atomic mass becomes 6 + 3 instead of 6 + 6. Thus it is reduced by 25%.

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