Atoms And Molecules Mock Tests

26 questions available

Atoms And Molecules Mock Test 1

Questions: 26

Sample Questions

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

How many moles are present in 36 g of water? (Atomic mass: H = 1 u, O = 16 u)

A 1 mole

B 2 moles

C 3 moles

D 0.5 mole

Class 9 Science

The chemical formula of calcium phosphate is:

A CaPO₄

B Ca₂PO₄

C Ca₃(PO₄)₂

D Ca₃PO₄

Class 9 Science

The atomic mass of magnesium is 24 u. How many moles are present in 120 g of magnesium?

A 2 moles

B 5 moles

C 10 moles

D 24 moles

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

What is the chemical formula of baking soda?

A NaCl

B Na₂CO₃

C NaHCO₃

D NaOH

Class 9 Science

Which of the following is a compound?

A Air

B Iron

C Water

D Gold

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

Comments

No comments yet. Be the first to share your thoughts!