1
IIT-JEE 1992
MCQ (Single Correct Answer)
+1
-0.25
Which of the following does not characterise X-rays?
A
The radiation can ionise gases
B
It causes ZnS to fluorescence
C
Deflected by electric and magnetic fields
D
Have wavelengths shorter than ultraviolet rays
2
IIT-JEE 1989
MCQ (Single Correct Answer)
+1
-0.25
The correct set of quantum numbers for the unpaired electron of chlorine atom is
A
n = 2, l = 1, m = 0
B
n = 2, l = 1, m = 1
C
n = 3, l = 1, m = 1
D
n = 3, l = 0, m = 0
3
IIT-JEE 1989
MCQ (Single Correct Answer)
+1
-0.25
The correct ground state electronic configuration of chromium atom is
A
[Ar] 3d5 4s1
B
[Ar] 3d4 4s2
C
[Ar] 3d6 4s0
D
[Ar] 4d5 4s1
4
IIT-JEE 1988
MCQ (Single Correct Answer)
+1
-0.25
The triad of nuclei that is isotonic is
A
$${}_6^{14}C$$, $${}_7^{15}N$$, $${}_9^{17}C$$
B
$${}_6^{12}C$$, $${}_7^{14}N$$, $${}_9^{19}C$$
C
$${}_6^{14}C$$, $${}_7^{14}N$$, $${}_9^{17}C$$
D
$${}_6^{14}C$$, $${}_7^{14}N$$, $${}_9^{19}C$$
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