$1\mathrm{u}$ is equal to:

Important Questions on Atoms and Molecules

EASY

NDA & NA EE

IMPORTANT

Chemistry Crash Course NDA & NA EE>Chapter 3 - Atoms and Molecules>Exercise 1>Q 2

The statement which is wrong about gram atomic mass is:

EASY

NDA & NA EE

IMPORTANT

Chemistry Crash Course NDA & NA EE>Chapter 3 - Atoms and Molecules>Exercise 1>Q 3

Chlorine occurs in nature in the form of two isotopes with atomic mass $35$ and $37$ in the ratio of $3 : 1$, respectively. The average atomic mass of chlorine is:

EASY

NDA & NA EE

IMPORTANT

Chemistry Crash Course NDA & NA EE>Chapter 3 - Atoms and Molecules>Exercise 1>Q 4

$2 \mathrm{g}$ of oxygen contain the number of atoms equal to that, contained in:

EASY

NDA & NA EE

IMPORTANT

Chemistry Crash Course NDA & NA EE>Chapter 3 - Atoms and Molecules>Exercise 1>Q 5

The number of sulphur atoms in $40 \mathrm{g}$ is:

EASY

NDA & NA EE

IMPORTANT

Chemistry Crash Course NDA & NA EE>Chapter 3 - Atoms and Molecules>Exercise 1>Q 7

How many atoms are present in one mole of ${\mathrm{H}}_2{\mathrm{SO}}_4?$

EASY

NDA & NA EE

IMPORTANT

Chemistry Crash Course NDA & NA EE>Chapter 3 - Atoms and Molecules>Exercise 1>Q 8

The mass of a molecule of water is:

EASY

NDA & NA EE

IMPORTANT

Chemistry Crash Course NDA & NA EE>Chapter 3 - Atoms and Molecules>Exercise 1>Q 9

A compound ${\mathrm{X}}_2{\mathrm{O}}_3$ contains $31.58\%$ oxygen by weight. The atomic mass of $\mathrm{X}$ is ______.

EASY

NDA & NA EE

IMPORTANT

Chemistry Crash Course NDA & NA EE>Chapter 3 - Atoms and Molecules>Exercise 1>Q 10

The law of constant proportion was proposed by