1

IIT-JEE 1998

MCQ (Single Correct Answer)
ASSERTION:
Nuclide $${}_{13}^{30}Al$$ is less stable than $${}_{20}^{40}Ca$$

REASON:
Nuclides having odd number of protons and neutrons are generally unstable.
A
If both assertion and reason are correct, and reason is the correct explanation of the assertion.
B
If both assertion and reason are correct, and reason is not the correct explanation of the assertion.
C
If assertion is correct but reason is incorrect.
D
If assertion is incorrect but reason is correct.
2

IIT-JEE 1998

MCQ (Single Correct Answer)
The orbital diagram in which the Aufbau principle is violated is
A
B
C
D
3

IIT-JEE 1997

MCQ (Single Correct Answer)
For a d-electron the orbital angular momentum is
A
$$\sqrt 6 \left( {h/2\pi } \right)$$
B
$$\sqrt 2 \left( {h/2\pi } \right)$$
C
$$ \left( {h/2\pi } \right)$$
D
$$2 \left( {h/2\pi } \right)$$
4

IIT-JEE 1996

MCQ (Single Correct Answer)
The orbital angular momentum of an electron in 2s orbital is
A
$$ + {1 \over 2}.{h \over {2\pi }}$$
B
Zero
C
$${h \over {2\pi }}$$
D
$$\sqrt 2 .{h \over {2\pi }}$$

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