CBSE Class 9 - Chemistry - Atoms and Molecules (MCQS)(#cbsenotes)(#eduvictors)

Chemistry - Atoms and Molecules 

(MCQs)

Q1: Identify the correct symbol of gold:
a. Ag
c. Gd
b. Ge
d. Au

Q2: Which of the following is tri-atomic?

a. Oxygen gas
b. Hydrogen gas
c. Ozone gas
d. Ammonia gas


Q3: The combining capacity of an element is called

a. Valency
c. Atomic number
b. Atomicity
d. Valence electrons




Q4: Mass of one mole of a substance is called 

a. molecular mass
b. molar mass
c. gram atomic mass
d. formula unit mass


Q5: 18g of water is electrolysed. The weight of oxygen obtained is:

a. 16g
b. 8g
c. 4g
d. 1g


Q6: Identify the correct symbol for Sodium element.

a. So
b. Sm
c. Na
d. Nd


Q7: The formula of Calcium phosphate is:

a. CaPO₄
c. Ca₃(PO₄)₂
b. Ca(PO₄)₂
d. Ca₂(PO₄)₃


Q8: HCO₃⁻ is a 

a. Monoatomic cation
b. Monoatomic anion
c. Polyatomic cation
d. Polyatomic anion


Q9: Out of 1 g of oxygen gas, 1 g of oxygen atoms and 1g of ozone, the maximum number of atoms are present in:

a. 1g of oxygen gas
c. 1 g of ozone
b. 1g of oxygen atoms
d. All have an equal number of atoms


Q10: An element X has valency equal to 3. What will be its formula with carbonate ions?

a. X₂CO₃
c. X₂(CO₃)₃
b. XCO₃
d. X(CO₃)₃


☛See also:
How to learn naming Chemical Formula
Ch 3 - Atoms and Molecules
Ch 3 - Atoms and Molecules (Worksheet)
Ch3 - Atoms and Molecules (MCQs) 
Ch 3 - Atoms, Molecules and Ions (Study Points)
All about Names of the Chemical Elements

Answers:
1: d. Au
2: c. Ozone gas
3: a. Valency
4: b. molar mass
5: a. 16g
6: c. Na
7: c. Ca₃(PO₄)₂
8: d. Polyatomic anion
9: d. All have an equal number of atoms
10:c. X₂(CO₃)₃