(A) 1S2, 2S2, 2P6, 3S2, 3P2
(B) 1S2, 2S2, 2P6, 3S2, 3P1
(C) 1S2, 2P6, 3S2, 3P3
(D) 1S2, 2S2, 3S2, 3P6, 4S1
Answer: (B) 1S2, 2S2, 2P6, 3S2, 3P1
Category: Chemistry MCQs Class 9
Chemistry solved multiple choice questions (MCQs) for class 9 with answers.
The natural abundance of chlorine-35 is:
(A) 65%
(B) 25%
(C) 75%
(D) 95%
Answer: (C) 75%
The number of moles in 46 gms of sodium (Na) will be:
(A) 1.5 moles
(B) 2 moles
(C) 2.5 moles
(D) 3 moles
Answer: (B) 2 moles
Which of the following is the most basic oxide?
(A) MgO
(B) BaO
(C) CaO
(D) SrO
Answer: (B) BaO
The Oxidation number of ‘N’ in HNO3 is:
(A) +2
(B) +3
(C) +5
(D) +7
Answer: (C) +5