JEE Main 2022 (Online) 28th July Morning Shift | d and f Block Elements Question 71 | Chemistry

1

JEE Main 2022 (Online) 28th July Morning Shift

MCQ (Single Correct Answer)

+4

-1

Match List - I with List - II, match the gas evolved during each reaction.

	List - I		List - II
(A)	$$\left(\mathrm{NH}_{4}\right)_{2} \mathrm{Cr}_{2} \mathrm{O}_{7} \stackrel{\Delta}{\longrightarrow}$$	(I)	$$\mathrm{H}_{2}$$
(B)	$$\mathrm{KMnO}_{4}+\mathrm{HCl} \rightarrow$$	(II)	$$\mathrm{N}_{2}$$
(C)	$$\mathrm{Al}+\mathrm{NaOH}+\mathrm{H}_{2} \mathrm{O} \rightarrow$$	(III)	$$\mathrm{O}_{2}$$
(D)	$$\mathrm{NaNO}_{3} \stackrel{\Delta}{\longrightarrow}$$	(IV)	$$\mathrm{Cl}_{2}$$

Choose the correct answer from the options given below :

A

$$(\mathrm{A})-(\mathrm{II}),(\mathrm{B})-(\mathrm{III}),(\mathrm{C})-(\mathrm{I}),(\mathrm{D})-(\mathrm{IV})$$

B

$$(\mathrm{A})-(\mathrm{III}),(\mathrm{B})-(\mathrm{I}),(\mathrm{C})-(\mathrm{IV}),(\mathrm{D})-(\mathrm{II})$$

C

$$(\mathrm{A})-(\mathrm{II}),(\mathrm{B})-(\mathrm{IV}),(\mathrm{C})-(\mathrm{I}),(\mathrm{D})-(\mathrm{III})$$

D

$$(\mathrm{A})-(\mathrm{III}),(\mathrm{B})-(\mathrm{IV}),(\mathrm{C})-(\mathrm{I}),(\mathrm{D})-(\mathrm{II})$$

2

JEE Main 2022 (Online) 28th July Morning Shift

MCQ (Single Correct Answer)

+4

-1

Which of the following has least tendency to liberate $$\mathrm{H}_{2}$$ from mineral acids?

A

Cu

B

Mn

C

Ni

D

Zn

3

JEE Main 2022 (Online) 27th July Evening Shift

MCQ (Single Correct Answer)

+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

$$\mathrm{SO}_{4}^{2-}$$

4

JEE Main 2022 (Online) 27th July Morning Shift

MCQ (Single Correct Answer)

+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.