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1

JEE Main 2021 (Online) 16th March Evening Shift

MCQ (Single Correct Answer)

+4

-1

The characteristics of elements X, Y and Z with atomic numbers, respectively, 33, 53 and 83 are :

A

X and Y are metalloids and Z is a metal.

B

X and Z are non-metals and Y is a metalloid.

C

X is a metalloid, Y is a non-metal and Z is a metal.

D

X, Y and Z are metals.

2

JEE Main 2021 (Online) 16th March Evening Shift

MCQ (Single Correct Answer)

+4

-1

Which of the following is least basic?

A

$${(C{H_3}CO)_2}\mathop N\limits^{..} H$$

B

$$(C{H_3}CO)\mathop N\limits^{..} H{C_2}{H_5}$$

C

$${({C_2}{H_5})_3}\mathop N\limits^{..} $$

D

$${({C_2}{H_5})_2}\mathop N\limits^{..} H$$

3

JEE Main 2021 (Online) 16th March Evening Shift

MCQ (Single Correct Answer)

+4

-1

Ammonolysis of Alkyl halides followed by the treatment with NaOH solution can be used to prepare primary, secondary and tertiary amines. The purpose of NaOH in the reaction is :

A

to remove acidic impurities

B

to remove basic impurities

C

to activate NH₃ used in the reaction

D

to increase the reactivity of alkyl halide

4

JEE Main 2021 (Online) 16th March Evening Shift

MCQ (Single Correct Answer)

+4

-1

The secondary structure of protein is stabilised by:

A

Hydrogen bonding

B

glycosidic bond

C

Peptide bond

D

van der Waals forces

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