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2+
2-
c) Cu and O
-
+
d) Cu and O
Q6 The formula of the sulphate of a metal M with the valency 3 is M2(SO4)3 1
(True/False)

Concept: Atomicity & Molecular mass of compounds

Q1. Assertion: The molecular mass of CaCO3 is 100 g. 1
Reason: The molecular mass of a compound is the sum of atomic
masses of all the atoms present in one molecule of it.
Q2 Assertion: Molecular mass of Sulphur molecule is 256 u. 1
Reason: Atomicity of Sulphur is 8.
Q3 Assertion: One molecule of Phosphorous can be represented as P4 1
Reason: Atomicity of Phosphorous is 4.
Q4 The relative molecular mass of MgSO4 is 1

a) 120 u b) 120 g
c) 100 g d) 100 u
Q5 The number of atoms in K MnO4 is 1

(a) 7 (b) 6 (c) 8 (d) 10

Q6 The relative molecular mass of H2SO4 is 98 g (True/False) 1

Concept: Mole concept and Numericals based on mole concept

23
Q1. Assertion: 60g of CH3COOH contains 6.022 X 10 number of atoms 1
Reason: One mole of substance contains Avogadro’s number of
particles.
Q2 Assertion: One atomic mass unit (amu) is mass of an atom equal to 1
exactly one-twelfth the mass of a carbon-12 atom.
Reason: Carbon-12 isotope was selected as standard.
Q3 Assertion : Atomicity of oxygen is 2. 1
23
Reason : 1 mole of an element contains 6.023 X10 atoms.
Q4 52 g of He contains 1
23
a) 4 X 6.022X 10 atoms
b) 13 atoms
23
c) 13 X 6.022 X 10 atoms
d) 4 atoms
Q5 The atomic mass of sodium is 23. The number of moles in 46 g of 1
sodium are

a) 1
b) 2
c) 2.3
d) 4.6
Q6 Mass of 1 mole of a substance is called its formula mass.( True/False) 1