1
JEE Main 2022 (Online) 27th July Evening Shift
+4
-1

In neutral or alkaline solution, $$\mathrm{MnO}_{4}^{-}$$ oxidises thiosulphate to :

A
$$\mathrm{S}_{2} \mathrm{O}_{7}^{2-}$$
B
$$\mathrm{S}_{2} \mathrm{O}_{8}^{2-}$$
C
$$\mathrm{SO}_{3}^{2-}$$
D
$$\mathrm{SO}_{4}^{2-}$$
2
JEE Main 2022 (Online) 27th July Morning Shift
+4
-1

Given below are two statements.

Statement I: Iron (III) catalyst, acidified $$\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}$$ and neutral $$\mathrm{KMnO}_{4}$$ have the ability to oxidise $$\mathrm{I}^{-}$$ to $$\mathrm{I}_{2}$$ independently.

Statement II: Manganate ion is paramagnetic in nature and involves $$\mathrm{p} \pi-\mathrm{p} \pi$$ bonding.

In the light of the above statements, choose the correct answer from the options given below.

A
Both Statement I and Statement II are true.
B
Both Statement I and Statement II are false.
C
Statement I is true but Statement II is false.
D
Statement I is false but Statement II is true.
3
JEE Main 2022 (Online) 27th July Morning Shift
+4
-1

Match List I with List II.

List I

Pollutant
List II

Disease/sickness
(A) Sulphate (>500 ppm) (I) Methemoglobinemia
(B) Nitrate (>50 ppm) (II) Brown mottling of teeth
(C) Lead (>50 ppb) (III) Laxative effect
(D) Fluoride (>2 ppm) (IV) Kidney damage

Choose the correct answer from the options given below:

A
A-IV, B-I, C-II, D-III
B
A-III, B-I, C-IV, D-II
C
A-II, B-IV, C-I, D-III
D
A-II, B-IV, C-III, D-I
4
JEE Main 2022 (Online) 26th July Evening Shift
+4
-1

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.

Assertion A: Finest gold is red in colour, as the size of the particles increases, it appears purple then blue and finally gold.

Reason R: The colour of the colloidal solution depends on the wavelength of light scattered by the dispersed particles.

In the light of the above statements, choose the most appropriate answer from the options given below.

A
Both A and R are true and R is the correct explanation of A.
B
Both A and R are true but R is NOT the correct explanation of A.
C
A is true but R is false.
D
A is false but R is true.
JEE Main Subjects
Physics
Mechanics
Electricity
Optics
Modern Physics
Chemistry
Physical Chemistry
Inorganic Chemistry
Organic Chemistry
Mathematics
Algebra
Trigonometry
Coordinate Geometry
Calculus
EXAM MAP
Joint Entrance Examination