Question

Q. No. 12 to 16 are Assertion-Reason questions carrying 1 mark each.
In these questions a statement of Assertion followed by a statement of Reason is given. Choose the
correct option out of the choices given below.
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(a) Assertion and Reason both are correct statements and Reason is the correct explanation of
Assertion.
(b) Assertion and Reason both are correct statements and Reason is not the correct explanation of
Assertion.
(c) Assertion is correct statement but Reason is incorrect statement.
(d) Assertion is incorrect statement but Reason is correct statement.
12. Assertion: Atomic size of group 18 elements is the largest in their respective periods.
Reason: Group 18 elements have Vander waals radii.
13. Assertion: Atomic masses of elements are mostly fractional.
Reason: Atomic mass of Chlorine is 35.5u
14. Assertion: 2s and 2p subshells experience same effective nuclear charge.
Reason: 2s and 2p subshells have same n value.
15. Assertion: Electrons in Fe3+ are more stable than Fe2+
.
Reason: Half-filled and completely filled subshells have minimum exchange energy.
16. Assertion: Properties of the elements are periodic functions of their atomic numbers.
Reason: Elements of a group have similar outer electronic configuration.

Answer 1

true

true

false

false

false

true

false

true

false

false

true

true

true

true