1
WB JEE 2020
MCQ (Single Correct Answer)
+1
-0.25
Change Language
Bond order of He2, $$He_2^ + $$ and $$He_2^{2 + }$$ are respectively
A
1, $${1 \over 2}$$, 0
B
0, $${1 \over 2}$$, 1
C
$${1 \over 2}$$, 1, 0
D
1, 0, $${1 \over 2}$$
2
WB JEE 2020
MCQ (Single Correct Answer)
+2
-0.5
Change Language
A homonuclear diatomic gas molecule shows 2-electron magnetic moment. The one-electron and two-electron reduced species obtained from above gas molecule can act as both oxidising and reducing agents. When the gas molecule is one-electron oxidised the bond length decreases compared to the neutral molecule. The gas molecule is
A
N2
B
Cl2
C
O2
D
B2
3
WB JEE 2019
MCQ (Single Correct Answer)
+1
-0.33
Change Language
The indicated atom is not a nucleophilic site in
A
$$\mathop B\limits_ \uparrow H_4^ - $$
B
$$\mathop C\limits_ \uparrow {H_3}Mgl$$
C
$$C{H_3}\mathop O\limits_ \uparrow H$$
D
$$C{H_3}\mathop N\limits_ \uparrow {H_2}$$
4
WB JEE 2019
MCQ (Single Correct Answer)
+1
-0.33
Change Language
The H - N - H angle in ammonia is 107.6$$^\circ$$ while the H - P - H angle in phosphine is 93.5$$^\circ$$. Relative to phosphine, the p-character of the lone-pair on ammonia is expected to be
A
Less
B
More
C
Same
D
Cannot be predicted
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