JEE Main 2021 Question Paper (22-Jul-2021) (Shift 1)

Question 1

The water having more dissolved ${\mathrm{O}}_{2}$ is :

Accepted Answer

water at $4^\circ \mathrm{C}$

Answer

boiling water

Answer

water at $80^\circ \mathrm{C}$

Answer

polluted water

Question 2

Which one of the following statements for D.I. Mendeleev is incorrect?

Accepted Answer

At the time, he proposed the Periodic Table of elements; the structure of the atom was known.

Answer

He authored the textbook - Principles of Chemistry.

Answer

Element with atomic number $101$ is named after him.

Answer

He invented the accurate barometer.

Question 3

Which purification technique is used for high boiling organic liquid compound (decomposes near its boiling point)?

Accepted Answer

Reduced pressure distillation

Answer

Simple distillation

Answer

Steam distillation

Answer

Fractional distillation

Question 4

Which of the following compounds will provide a tertiary alcohol on reaction with excess of ${\mathrm{CH}}_{3}\mathrm{MgBr}$ followed by hydrolysis?

Accepted Answer

""

Answer

Answer

Answer

Question 5

Which of the following compounds does not exhibit resonance?

Accepted Answer

$\mathrm{CH}_3\mathrm{CH}_2\mathrm{CH}=\mathrm{CHCH}_2\mathrm{NH}_2$

Answer

$\mathrm{CH}_3\mathrm{CH}_2\mathrm{OCH}=\mathrm{CH}_2$

Answer

Answer

$\mathrm{CH}_3\mathrm{CH}_2\mathrm{CH}_2\mathrm{CONH}_2$