1
IIT-JEE 2000 Screening
MCQ (Single Correct Answer)
+1
-0.25
The electronic configuration of an element is 1s2, 2s2 2p6, 3s2 3p6 3d5, 4s1 This represents its
A
excited state
B
ground state
C
cationic form
D
anionic form
2
IIT-JEE 1999
MCQ (Single Correct Answer)
+2
-0.5
The electrons, identified by quantum numbers n and l, (i) n = 4, l = 1, (ii) n = 4, l = 0, (iii) n = 3, l = 2 and (iv) n = 3, l = 1 can be placed in order of increasing energy, from the lowest to highest, as
A
(iv)<(ii)<(iii)<(i)
B
(ii)<(iv)<(i)<(iii)
C
(i)<(iii)<(ii)<(iv)
D
(iii)<(i)<(iv)<(ii)
3
IIT-JEE 1998
MCQ (Single Correct Answer)
+1
-0.25
The orbital diagram in which the Aufbau principle is violated is
A
IIT-JEE 1998 Chemistry - Structure of Atom Question 51 English Option 1
B
IIT-JEE 1998 Chemistry - Structure of Atom Question 51 English Option 2
C
IIT-JEE 1998 Chemistry - Structure of Atom Question 51 English Option 3
D
IIT-JEE 1998 Chemistry - Structure of Atom Question 51 English Option 4
4
IIT-JEE 1998
MCQ (Single Correct Answer)
+2
-0.5
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.
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