How many moles of electrons weight one kilogram?

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 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$(\mathrm{density}=1 \mathrm{g} {\mathrm{cm}}^{-3})$

MEDIUM

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 1 - Some Basic Concepts of Chemistry>Competition Focus>Q 20

The mass of $2.24\times {10}^{-3} {\mathrm{m}}^3$ of a gas is $4.4 \mathrm{g}$ at $273.15 \mathrm{K}$ and $101.325 \mathrm{KPa}$ pressure. The gas may be

MEDIUM

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 1 - Some Basic Concepts of Chemistry>Competition Focus>Q 21

The total number of atoms of all elements present in a mole of ammonium dichromate is