Question

a) Assertion and reason both are correct statements and reason is correct explanation for assertion.

b) Assertion and reason both are correct statements but reason is not correct explanation for

assertion.

c) Assertion is correct statement but reason is wrong statement.

d) Assertion is wrong statement but reason is correct statement.

12. Assertion : One atomic mass unit (amu) is mass of an atom equal to exactly one-twelfth the mass

of a carbon-12 atom.

Reason : Carbon-12 isotope was selected as standard.

1

13. Assertion : Shielding effect increases as we go down the group.

Reason : More is the number of electrons in the penultimate shell, more is shielding.

1

14. Assertion : Noble gases have zero electron gain enthalpy.

Reason : High electron gain enthalpy shows that the electron is loosely bonded to the atom.

1

15. Assertion : A resonance hybrid is always more stable than any of its canonical structures.

Reason : This stability is due to delocalization of electrons.

1

16. Assertion : Oxidation number of carbon in CH2O is zero.

Reason : CH2O formaldehyde, is a covalent compound.
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Answer 1

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Answer 2

Answer:

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Explanation:

12 . (c)

13. (a)

14. (c)

15. (a)

16. (b)