1
WB JEE 2018
MCQ (Single Correct Answer)
+1
-0.33
Change Language
The number of unpaired electrons in Ni (atomic number = 28) are
A
0
B
2
C
4
D
8
2
WB JEE 2017
MCQ (Single Correct Answer)
+1
-0.25
Change Language
If the given four electronic configurations.

(i) n = 4, l = 1

(ii) n = 4, l = 0

(iii) n = 3, l = 2

(iv) n = 3, l = 1

are arranged in order of increasing energy, then the order will be
A
(iv) < (ii) < (iii) < (i)
B
(ii) < (iv) < (i) < (iii)
C
(i) < (iii) < (ii) < (iv)
D
(iii) < (i) < (iv) < (ii)
3
WB JEE 2017
MCQ (Single Correct Answer)
+1
-0.25
Change Language
Which of the following sets of quantum numbers represents the 19th electron of Cr(Z = 24) ?
A
$$\left( {4,1, - 1, + {1 \over 2}} \right)$$
B
$$\left( {4,0,0, + {1 \over 2}} \right)$$
C
$$\left( {3,2,0, - {1 \over 2}} \right)$$
D
$$\left( {3,2, - 2, + {1 \over 2}} \right)$$
4
WB JEE 2017
MCQ (Single Correct Answer)
+1
-0.25
Change Language
Which one of the following corresponds to a photon of highest energy?
A
$$\lambda$$ = 300 mm
B
v = 3 $$\times$$ 108 s$$-$$1
C
$$\overline v $$ = 30 cm$$-$$1
D
$$\varepsilon $$ = 6.626 $$\times$$ 10$$-$$27 J
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