The Science Springboard: A Foundation Course Based on NCERT Curriculum>Chapter 17 - Competition Corner-2>Exercise: Atoms and Molecules

MEDIUM

9th CBSE

IMPORTANT

Earn 100

The relative molecular mass of copper $(II)$ sulphate, ${CuSO}_{4}$ is $160$ and the relative molecular mass of water is $18$ . The percentage by mass of water in copper $(II)$ sulphate crystals, ${CuSO}_{4} . 5 H_{2} O$ is

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Important Questions on Competition Corner-2

MEDIUM

9th CBSE

IMPORTANT

The Science Springboard: A Foundation Course Based on NCERT Curriculum>Chapter 17 - Competition Corner-2>Exercise: Atoms and Molecules

Calculate the number of particles in

0.1

moles of carbon atoms?

HARD

9th CBSE

IMPORTANT

The Science Springboard: A Foundation Course Based on NCERT Curriculum>Chapter 17 - Competition Corner-2>Exercise: Atoms and Molecules

Which of the following ammonium salts will liberate the greatest amount of ammonia on heating?

HARD

9th CBSE

IMPORTANT

The Science Springboard: A Foundation Course Based on NCERT Curriculum>Chapter 17 - Competition Corner-2>Exercise: Atoms and Molecules

Calculate the mass of

3.011 \times 10^{23}

number of atoms of

N

.

EASY

9th CBSE

IMPORTANT

The Science Springboard: A Foundation Course Based on NCERT Curriculum>Chapter 17 - Competition Corner-2>Exercise: Atoms and Molecules

The anion present in calcium hydride is

EASY

9th CBSE

IMPORTANT

The Science Springboard: A Foundation Course Based on NCERT Curriculum>Chapter 17 - Competition Corner-2>Exercise: Atoms and Molecules

The gas which has a molecular mass twice that of oxygen gas is

MEDIUM

9th CBSE

IMPORTANT

The Science Springboard: A Foundation Course Based on NCERT Curriculum>Chapter 17 - Competition Corner-2>Exercise: Atoms and Molecules

The element which can form gases having two different atomicities is

EASY

9th CBSE

IMPORTANT

The Science Springboard: A Foundation Course Based on NCERT Curriculum>Chapter 17 - Competition Corner-2>Exercise: Atoms and Molecules

Which of the following is a correct formula of the calcium carbonate?

MEDIUM

9th CBSE

IMPORTANT

The Science Springboard: A Foundation Course Based on NCERT Curriculum>Chapter 17 - Competition Corner-2>Exercise: Atoms and Molecules

The element which loses electrons to form ions with variable valencies is