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SAI International School
Subject-Chemistry

Ch-Atoms and Molecules
Topic-Writing chemical formulae of the compounds
HOME ASSIGNMENT

OBJECTIVE QUESTIONS

Q.1 Assertion: The formula of Calcium oxide is CaO.
Reason: Valency of Calcium is 2 and Oxygen is also

Q.2 Assertion: The valency of Nitrogen in Aluminium nitride is 3.
3+
Reason: The formula of Aluminium ion is Al .
Q.3 Assertion: Calcium hydroxide formula is CaOH 2.
2+
Reason: The formula of calcium ion is Ca and hydroxide ion is OH.
Q.4 Formula for sulphur dioxide is SO 3. (True/False)
Q.5 The formula of chloride of a metal M is MCl 3 , then the formula of the
phosphate of metal M will be
a) MPO 4
b) M 2PO 4
c) M 3PO 4
d) M 2(PO 4) 3

Q.6
The formula Calcium bicarbonate is
a) CaHCO 3
b) Ca 2HCO 3
c) Ca(HCO 3) 2
d) CaCO 3
Q.7 The formula of oxide of a metal is MO, the formula of its chloride is:
a) MCl
b) M 2Cl
c) M 3Cl 2
d) MCl 2
Q.8 The formula of oxide of a metal X is X2O3. What is the valency of the
metal?
a) 2
b) 3
c) 4
d) 1

Subjective:
S.LNo. Questions Mark

1