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1

JEE Main 2021 (Online) 25th July Morning Shift

MCQ (Single Correct Answer)

+4

-1

The ionic radii of K⁺, Na⁺, Al³⁺ and Mg²⁺ are in the order:

A

Na⁺ < K⁺ < Mg²⁺ < Al³⁺

B

Al³⁺ < Mg²⁺ < K⁺ < Na⁺

C

Al³⁺ < Mg²⁺ < Na⁺ < K⁺

D

K⁺ < Al³⁺ < Mg²⁺ < Na⁺

2

JEE Main 2021 (Online) 25th July Morning Shift

MCQ (Single Correct Answer)

+4

-1

Which one of the following compounds of Group-14 elements is not known?

A

[GeCl₆]^2$$-$$

B

[Sn(OH)₆]^2$$-$$

C

[SiCl₆]^2$$-$$

D

[SiF₆]^2$$-$$

3

JEE Main 2021 (Online) 25th July Morning Shift

MCQ (Single Correct Answer)

+4

-1

Which one among the following resonating structures is not correct?

A

JEE Main 2021 (Online) 25th July Morning Shift Chemistry - Basics of Organic Chemistry Question 159 English Option 1

B

JEE Main 2021 (Online) 25th July Morning Shift Chemistry - Basics of Organic Chemistry Question 159 English Option 2

C

JEE Main 2021 (Online) 25th July Morning Shift Chemistry - Basics of Organic Chemistry Question 159 English Option 3

D

JEE Main 2021 (Online) 25th July Morning Shift Chemistry - Basics of Organic Chemistry Question 159 English Option 4

4

JEE Main 2021 (Online) 25th July Morning Shift

MCQ (Single Correct Answer)

+4

-1

The correct order of following 3d metal oxides, according to their oxidation numbers is :

(a) CrO₃, (b) Fe₂O₃, (c) MnO₂, (d) V₂O₅, (e) Cu₂O

A

(d) > (a) > (b) > (c) > (e)

B

(a) > (c) > (d) > (b) > (e)

C

(a) > (d) > (c) > (b) > (e)

D

(c) > (a) > (d) > (e) > (b)

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