HARD

9th CBSE

IMPORTANT

Earn 100

Which has more number of atoms: $100 g$ of potassium or $100 g$ of iron (Given: atomic mass of potassium = $39 u$ , iron = $56 u$ )?

Important Questions on Atoms and Molecules

HARD

9th CBSE

IMPORTANT

LIVING SCIENCE CHEMISTRY 9>Chapter 3 - Atoms and Molecules>Higher Order Thinking Skills (HOTS) Questions>Q 2

Buckminsterfullerene is an allotrope of carbon in which atoms of carbon form pentagonal and hexagonal rings which are joined together to form a football-like round structure. Its molecular formula is

C_{60}

. The molar mass of buckminsterfullerene and the number of atoms in one gram molecule of it are:

HARD

9th CBSE

IMPORTANT

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

DDT is used as an insecticide which is banned in many countries because it causes cancer and its life-period is

10

years. Its molecular formula is

C_{14} H_{9} {Cl}_{5}

. In

0.1 g

of DDT,
a. how many atoms of chlorine are there?
b. how many molecules of DDT are there?
c. how many moles of DDT are there?

HARD

9th CBSE

IMPORTANT

LIVING SCIENCE CHEMISTRY 9>Chapter 3 - Atoms and Molecules>Higher Order Thinking Skills (HOTS) Questions>Q 4

Cisplatin is a platinum (ll) compound used as a medicine in chemotherapy for cancer. The molecular formula of cisplatin is

[Pt ({NH}_{3})_{2} {Cl}_{2}]

0.1 g

of cisplatin contains
a. how many atoms of platinum?
b. how many molecules of the compound?
c. how many moles of the compound?

HARD

9th CBSE

IMPORTANT

LIVING SCIENCE CHEMISTRY 9>Chapter 3 - Atoms and Molecules>Higher Order Thinking Skills (HOTS) Questions>Q 5

Chloromycetin is an antibiotic used for the treatment of typhoid and eye diseases. The molecular formula of chloromycetin is

C_{11} H_{12} N_{2} O_{5} {Cl}_{2}

0.2 g

of chloromycetin contains
a. how many atoms of nitrogen?
b. how many molecules of the compound?
c. how many moles of the compound?

HARD

9th CBSE

IMPORTANT

LIVING SCIENCE CHEMISTRY 9>Chapter 3 - Atoms and Molecules>Higher Order Thinking Skills (HOTS) Questions>Q 6

Penicillin is an antibiotic used for the treatment of infectious diseases. The molecular formula of penicillin is

C_{16} H_{18} N_{2} O_{4} S

0.2 g

of penicillin contains
a. how many atoms of nitrogen?
b. how many atoms of sulphur?
c. how many molecules of the compound?
d. how many moles of the compound?

HARD

9th CBSE

IMPORTANT

LIVING SCIENCE CHEMISTRY 9>Chapter 3 - Atoms and Molecules>Higher Order Thinking Skills (HOTS) Questions>Q 7

Saccharin is used as an artificial sweetening agent. The molecular formula of saccharin is

C_{7} H_{5} {NO}_{3} S

. 0.2 g of saccharin contains
a. how many atoms of nitrogen?
b. how many molecules of the compound?
c. how many moles of the compound?

HARD

9th CBSE

IMPORTANT

LIVING SCIENCE CHEMISTRY 9>Chapter 3 - Atoms and Molecules>Higher Order Thinking Skills (HOTS) Questions>Q 8

How many atoms of oxygen are present in

0.5

g of phosphorus pentoxide

(P_{4} O_{10})

HARD

9th CBSE

IMPORTANT

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

Caffeine present in tea and coffee is known to improve our mood. The molecular formula of caffeine is

C_{8} H_{10} N_{4} O_{2}

0.2 g

of caffeine contains
a. how many atoms of nitrogen?
b. how many molecules of the compound?
c. how many moles of the compound?

Which has more number of atoms: 100 g of potassium or 100 g of iron (Given: atomic mass of potassium =39 u, iron =56 u)?

Important Questions on Atoms and Molecules

Learn and Prepare for any exam you want !

Which has more number of atoms: $100 g$ of potassium or $100 g$ of iron (Given: atomic mass of potassium = $39 u$ , iron = $56 u$ )?