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1
JEE Main 2021 (Online) 27th July Evening Shift
MCQ (Single Correct Answer)
+4
-1
Match List - I with List - II :

List - I
(compound)		 List - II
(effect/affected species)
(a) Carbon monoxide (i) Carcinogenic
(b) Sulphur dioxide (ii) Metabolized by pyrus plants
(c) Polychlorinated biphenyls (iii) haemoglobin
(d) Oxides of Nitrogen (iv) Stiffness of flower buds


Choose the correct answer from the options given below :
A
(a) - (iii), (b) - (iv), (c) - (i), (d) - (ii)
B
(a) - (iv), (b) - (i), (c) - (iii), (d) - (ii)
C
(a) - (i), (b) - (ii), (c) - (iii), (d) - (iv)
D
(a) - (iii), (b) - (iv), (c) - (ii), (d) - (i)
2
JEE Main 2021 (Online) 27th July Evening Shift
MCQ (Single Correct Answer)
+4
-1
Number of Cl = O bonds in chlorous acid, chloric acid and perchloric acid respectively are :
A
3, 1 and 1
B
4, 1 and 0
C
1, 1 and 3
D
1, 2 and 3
3
JEE Main 2021 (Online) 27th July Morning Shift
MCQ (Single Correct Answer)
+4
-1
The product obtained from the electrolytic oxidation of acidified sulphate solutions, is :
A
HSO$$_4^ - $$
B
HO3SOOSO3H
C
HO2SOSO2H
D
HO3SOSO3H
4
JEE Main 2021 (Online) 22th July Evening Shift
MCQ (Single Correct Answer)
+4
-1
Given below are the statements about diborane

(a) Diborane is prepared by the oxidation of NaBH4 with I2

(b) Each boron atom is in sp2 hybridized state

(c) Diborane has one bridged 3 centre-2-electron bond

(d) Diborane is a planar molecule

The option with correct statements is -
A
(c) and (d) only
B
(a) only
C
(c) only
D
(a) and (b) only
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