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Question

Choose the correct option regarding the following statements:

Statement 1: Heavy water is 50% heavier than normal water.
Statement 2: Atomic mass of hydrogen is 1.008 amu.

A
Statement 1 is correct but statement 2 is incorrect.
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B
Statement 1 is incorrect but statement 2 is correct.
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C
Both statement 1 and statement 2 are incorrect.
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D
Both statement 1 and statement 2 are correct.
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Solution

The correct option is B Statement 1 is incorrect but statement 2 is correct.
The molecular formula of heavy water is D2O. Deuterium is an isotope of hydrogen. The atomic mass of hydrogen is 1.008 amu and the atomic mass of deuterium is 2.014 amu.

The hydrogen atom does not contain neutron while deuterium contains one neutron. So, heavy water is 10% heavier than normal water as it contains one extra neutron than hydrogen.

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