1
WB JEE 2018
MCQ (Single Correct Answer)
+1
-0.33
Change Language
Which of the following has the strongest H-bond?
A
O$$-$$H ... S
B
S$$-$$H ... O
C
F$$-$$H ... F
D
F$$-$$H ... O
2
WB JEE 2018
MCQ (Single Correct Answer)
+1
-0.33
Change Language
The half-life of C14 is 5760 years. For a 200 mg sample of C14, the time taken to change to 25 mg is
A
11520 years
B
23040 years
C
5760 years
D
17280 years
3
WB JEE 2018
MCQ (Single Correct Answer)
+1
-0.33
Change Language
Ferric ion forms a Prussian blue precipitate due to the formation of
A
$${K_4}[Fe{(CN)_6}]$$
B
$${K_3}[Fe{(CN)_6}]$$
C
$$Fe{(CNS)_3}$$
D
$$F{e_4}{[Fe{(CN)_6}]_3}$$
4
WB JEE 2018
MCQ (Single Correct Answer)
+1
-0.33
Change Language
The nucleus $$_{29}^{64}$$Cu accepts an orbital electron to yield,
A
$$_{28}^{65}$$Ni
B
$$_{30}^{64}$$Zn
C
$$_{28}^{64}$$Ni
D
$$_{30}^{65}$$Zn
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