1
MHT CET 2026 13th April Morning Shift
MCQ (Single Correct Answer)
+1
-0
What is the atomic number of an element having $ns^1$ electronic configuration and belonging to 3d transition series?
A
Only 24
B
Only 25
C
Only 29
D
24 and 29
2
MHT CET 2026 13th April Morning Shift
MCQ (Single Correct Answer)
+1
-0
Which of the following elements is doped to a fiber amplifier in an optical fiber communication system?
A
Tm
B
Yb
C
Er
D
Nd
3
MHT CET 2026 11th April Evening Shift
MCQ (Single Correct Answer)
+1
-0
Which of the following lanthanoids is radioactive?
A
Tm
B
Dy
C
Eu
D
Pm
4
MHT CET 2026 11th April Evening Shift
MCQ (Single Correct Answer)
+1
-0
Which transition series includes elements Co and Mo respectively?
A
4d and 5d
B
5d and 6d
C
3d and 4d
D
3d and 6d

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