Atoms And Molecules Mock Tests

26 questions available

Atoms And Molecules Mock Test 1

Questions: 26

नमूना प्रश्न

Class 9 Science

The chemical formula of aluminum sulfate is:

A AlSO₄

B Al₂SO₄

C Al₂(SO₄)₃

D Al₃(SO₄)₂

Class 9 Science

Which of the following statements is NOT true about compounds?

A Compounds can be separated into components by physical methods

B Compounds have fixed melting and boiling points

C A compound has properties different from its constituent elements

D A compound has a definite ratio of elements by mass

Class 9 Science

What is the chemical formula of washing soda?

A NaHCO₃

B Na₂CO₃·10H₂O

C Na₂CO₃

D NaOH

Class 9 Science

Avogadro constant is equal to:

A 6.022 × 10²³

B 6.022 × 10²²

C 6.022 × 10²⁴

D 60.22 × 10²³

Class 9 Science

The molecular mass of water (H₂O) is:

A 16 u

B 17 u

C 18 u

D 20 u

Class 9 Science

When calcium carbonate is heated, it decomposes to form calcium oxide and carbon dioxide. The mass of CaO produced from 100 g of CaCO₃ is: (Ca = 40, C = 12, O = 16)

A 56 g

B 44 g

C 100 g

D 28 g

Class 9 Science

What is the molecular mass of nitric acid (HNO₃)? (H = 1 u, N = 14 u, O = 16 u)

A 49 u

B 63 u

C 46 u

D 31 u

Class 9 Science

The molecular mass of NH₃ is: (N = 14 u, H = 1 u)

A 15 u

B 17 u

C 14 u

D 18 u

Atoms And Molecules Mock Tests

Atoms And Molecules Mock Test 1

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