9th Class Chemistry MCQs with answers for grade 9 chemistry subject paper preparation online.
9th Class Chemistry MCQs
How many numbers of moles are equivalent to 8 grams of CO2?
(A) 0.15
(B) 0.18
(C) 0.21
(D) 0.24
Formula: No. of moles = Given mass/Molar mass
The number of particles in one mole of a substance is called:
(A) Atomic number
(B) Particle number
(C) Avogadro’s number
(D) Mass number
Which one of the followings shows the simplest whole number ratio of atoms in a substance?
(A) Molecular formula
(B) Empirical formula
(C) Chemical formula
(D) Covalent formula
An atom or group of atoms having odd number of electrons is called:
(A) Radical
(B) Ion
(C) Free radical
(D) Molecular ion
The unique property of an element is called:
(A) Electronegativity
(B) Valency
(C) Mobility
(D) Oxidation number
Which one of the followings has sharp and fixed melting point?
(A) Compound
(B) Mixture
(C) Both
(D) None of these
All of the followings are tri-atomic molecule except:
(A) H2
(B) O3
(C) H2O
(D) CO2
An atom or group of atoms having positive charge on it is called:
(A) Cation
(B) Anion
(C) Molecule
(D) Atom
One amu (atomic mass unit) is equivalent to:
(A) 1.66 × 10-24 mg
(B) 1.66 ×10–24g
(C) 1.66 × 10–21g
(D) 1.66 × 10–23g
It has the highest percentage in earth’s crust and oceans.
(A) calcium
(B) carbon
(C) oxygen
(D) nitrogen
