Atoms And Molecules Mock Tests

26 questions available

Atoms And Molecules Mock Test 1

Questions: 26

Sample Questions

Class 9 Science

The chemical formula of calcium chloride is:

A CaCl

B CaCl₂

C Ca₂Cl

D Ca₂Cl₂

Class 9 Science

An element X has 3 electrons in its outermost shell. What is the chemical formula of its chloride? (Cl has valency 1)

A XCl

B XCl₂

C XCl₃

D X₃Cl

Class 9 Science

What is the chemical formula of washing soda?

A NaHCO₃

B Na₂CO₃·10H₂O

C Na₂CO₃

D NaOH

Class 9 Science

The chemical formula of calcium phosphate is:

A CaPO₄

B Ca₂PO₄

C Ca₃(PO₄)₂

D Ca₃PO₄

Class 9 Science

What is the molecular mass of water (H₂O)?

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

The molecular mass of water (H₂O) is:

A 16 u

B 17 u

C 18 u

D 20 u

Class 9 Science

The chemical formula of ammonium sulfate is:

A NH₄SO₄

B (NH₄)₂SO₄

C NH₄(SO₄)₂

D NH₄HSO₄

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