LIVING SCIENCE CHEMISTRY 9>Chapter 3 - Atoms and Molecules>Higher Order Thinking Skills (HOTS) Questions>Q 10

MEDIUM

9th CBSE

IMPORTANT

Earn 100

Caffeine ( $C_{8} H_{10} N_{4} O_{2}$ ) present in tea and coffee is known to improve our mood. What is the mass in grams of one molecule of caffeine?

Important Questions on Atoms and Molecules

MEDIUM

9th CBSE

IMPORTANT

LIVING SCIENCE CHEMISTRY 9>Chapter 3 - Atoms and Molecules>Higher Order Thinking Skills (HOTS) Questions>Q 11

What is the difference between manganate ion and permanganate ion? Write the formulae and names of two compounds containing these ions.

HARD

9th CBSE

IMPORTANT

LIVING SCIENCE CHEMISTRY 9>Chapter 3 - Atoms and Molecules>Higher Order Thinking Skills (HOTS) Questions>Q 12

Calculate the total number of electrons present in one mole of ammonia (

{NH}_{3}

).

EASY

9th CBSE

IMPORTANT

LIVING SCIENCE CHEMISTRY 9>Chapter 3 - Atoms and Molecules>TEST PAPER>Q 1

Define mole.

EASY

9th CBSE

IMPORTANT

LIVING SCIENCE CHEMISTRY 9>Chapter 3 - Atoms and Molecules>TEST PAPER>Q 1

Define molar mass.

EASY

9th CBSE

IMPORTANT

LIVING SCIENCE CHEMISTRY 9>Chapter 3 - Atoms and Molecules>TEST PAPER>Q 1

Define gram-molecular mass.

EASY

9th CBSE

IMPORTANT

LIVING SCIENCE CHEMISTRY 9>Chapter 3 - Atoms and Molecules>TEST PAPER>Q 2

Define valency.

EASY

9th CBSE

IMPORTANT

LIVING SCIENCE CHEMISTRY 9>Chapter 3 - Atoms and Molecules>TEST PAPER>Q 2

Define valence electron.

MEDIUM

9th CBSE

IMPORTANT

LIVING SCIENCE CHEMISTRY 9>Chapter 3 - Atoms and Molecules>TEST PAPER>Q 3

State the postulates of Dalton's atomic theory. Is the theory valid at present? Give reasons.