The weight of a molecule of the compound ${\mathrm{C}}_{60}{\mathrm{H}}_{122}$ is:

Important Questions on Some Basic Concepts of Chemistry

HARD

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 1 - Some Basic Concepts of Chemistry>Competition Focus>Q 12

$10 {\mathrm{dm}}^3 \mathrm{of} {\mathrm{N}}_2$ gas and $10 {\mathrm{dm}}^3$of gas $\mathrm{X}$ at the same temperature contains the same number of molecules. The gas $\mathrm{X}$ is

MEDIUM

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 1 - Some Basic Concepts of Chemistry>Competition Focus>Q 13

How many moles of electrons weight one kilogram?

HARD

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 1 - Some Basic Concepts of Chemistry>Competition Focus>Q 14

The total number of electrons in $18 \mathrm{mL}$ of water$\left(\mathrm{density}=1 \mathrm{g} {\mathrm{mL}}^{-1}\right)$ is

MEDIUM

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 1 - Some Basic Concepts of Chemistry>Competition Focus>Q 15

A gas mixture contains $50 \%$ helium and $50 \%$ methane by volume. What is the percentage by weight of methane in the mixture?

EASY

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 1 - Some Basic Concepts of Chemistry>Competition Focus>Q 16

If we consider that $\frac{1}{6}$, in place of $\frac{1}{12}$, the mass of carbon atom is taken to be the relative atomic mass unit, the mass of one mole of substance will

HARD

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 1 - Some Basic Concepts of Chemistry>Competition Focus>Q 17

A person has as many notes as number of oxygen atoms in $24.8 \mathrm{g} {\mathrm{Na}}_2{\mathrm{S}}_2{\mathrm{O}}_3.5{\mathrm{H}}_2\mathrm{O} (\mathrm{mol}. \mathrm{wt}. =248)$. A note counting machine count $48$ million notes per day. How many days it would it take to count these notes?

HARD

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 1 - Some Basic Concepts of Chemistry>Competition Focus>Q 18

Number of moles in $1 {\mathrm{m}}^3$ at $\mathrm{STP}$ are

MEDIUM

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 1 - Some Basic Concepts of Chemistry>Competition Focus>Q 19

The volume occupied by one molecule of water$(\mathrm{density}=1 \mathrm{g} {\mathrm{cm}}^{-3})$