JEE Main 2022 (Online) 29th July Morning Shift | d and f Block Elements Question 67 | Chemistry

1

JEE Main 2022 (Online) 29th July Morning Shift

MCQ (Single Correct Answer)

+4

-1

The reaction of zinc with excess of aqueous alkali, evolves hydrogen gas and gives :

A

$$\mathrm{Zn}(\mathrm{OH})_{2}$$

B

$$\mathrm{ZnO}$$

C

$$\left[\mathrm{Zn}(\mathrm{OH})_{4}\right]^{2-}$$

D

$$\left[\mathrm{ZnO}_{2}\right]^{2-}$$

2

JEE Main 2022 (Online) 29th July Morning Shift

MCQ (Single Correct Answer)

+4

-1

In following pairs, the one in which both transition metal ions are colourless is :

A

$$\mathrm{Sc}^{3+}, \mathrm{Zn}^{2+}$$

B

$$\mathrm{Ti}^{4+}, \mathrm{Cu}^{2+}$$

C

$$\mathrm{V}^{2+}, \mathrm{Ti}^{3+}$$

D

$$\mathrm{Zn}^{2+}, \mathrm{Mn}^{2+}$$

3

JEE Main 2022 (Online) 29th July Morning Shift

MCQ (Single Correct Answer)

+4

-1

In neutral or faintly alkaline medium, $$\mathrm{KMnO}_{4}$$ being a powerful oxidant can oxidize, thiosulphate almost quantitatively, to sulphate. In this reaction overall change in oxidation state of manganese will be :

A

5

B

1

C

0

D

3

4

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

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