One mole is the short form of a molecule of a substance.

Important Questions on Atomic Structure; Physical and Chemical Properties of Matter

EASY

9th West Bengal Board

IMPORTANT

PHYSICAL SCIENCE & ENVIRONMENT CLASS 9>Chapter 4 - Atomic Structure; Physical and Chemical Properties of Matter>EXERCISE>Q B

$1$ gram-atom of an element is equals to the numbers of atoms present in $1$ gram of the element.

EASY

9th West Bengal Board

IMPORTANT

PHYSICAL SCIENCE & ENVIRONMENT CLASS 9>Chapter 4 - Atomic Structure; Physical and Chemical Properties of Matter>EXERCISE>Q B

$1$ $\mathrm{amu}$ is $1.6603\times {10}^{-24} \mathrm{g}$.

EASY

9th West Bengal Board

IMPORTANT

PHYSICAL SCIENCE & ENVIRONMENT CLASS 9>Chapter 4 - Atomic Structure; Physical and Chemical Properties of Matter>EXERCISE>Q B

Molar volume of any gas at STP is $22.4$ litres.

EASY

9th West Bengal Board

IMPORTANT

PHYSICAL SCIENCE & ENVIRONMENT CLASS 9>Chapter 4 - Atomic Structure; Physical and Chemical Properties of Matter>EXERCISE>Q B

Number of atoms of oxygen present in $1$ gram-mole of ozone is $2\times 6.022\times {10}^{23}$.

EASY

9th West Bengal Board

IMPORTANT

PHYSICAL SCIENCE & ENVIRONMENT CLASS 9>Chapter 4 - Atomic Structure; Physical and Chemical Properties of Matter>EXERCISE>Q B

$\mathrm{NaCl}$ is not the molecular formula of sodium chloride.

EASY

9th West Bengal Board

IMPORTANT

PHYSICAL SCIENCE & ENVIRONMENT CLASS 9>Chapter 4 - Atomic Structure; Physical and Chemical Properties of Matter>EXERCISE>Q C

What is meant by $1$ mole Hydrogen atom?

EASY

9th West Bengal Board

IMPORTANT

PHYSICAL SCIENCE & ENVIRONMENT CLASS 9>Chapter 4 - Atomic Structure; Physical and Chemical Properties of Matter>EXERCISE>Q C

Name one gas whose gram-molecular mass and gram atomic mass are same?

EASY

9th West Bengal Board

IMPORTANT

PHYSICAL SCIENCE & ENVIRONMENT CLASS 9>Chapter 4 - Atomic Structure; Physical and Chemical Properties of Matter>EXERCISE>Q C

Calculate the molecular mass of ${\mathrm{H}}_3{\mathrm{PO}}_4$ In amu. Given atomic masses of $\mathrm{H}$, $\mathrm{P}$ and $\mathrm{O}$ are $1 \mathrm{u}$, $31 \mathrm{u}$ and $16 \mathrm{u}$ respectively.