(A) Combustion
(B) Decomposition
(C) Displacement
(D) Combination
Answer: (A) Combustion
Category: Chemistry MCQs Class 9
Chemistry MCQs questions with answers of class 9 or 9th class. SSC Part-I chemistry multiple choice questions from past papers.
The average mass number of all naturally found isotopes of an element is called:
(A) Atomic mass
(B) Atomic mass unit
(C) Formula mass
(D) Mass number
Answer: (A) Atomic mass
In water (H2O) the ratio by mass between Hydrogen and Oxygen is:
(A) 1:8
(B) 1:16
(C) 3:4
(D) 3:8
Answer: (A) 1:8
The study of Hydro Carbons and their derivatives is called:
(A) Organic Chemistry
(B) Physical Chemistry
(C) Inorganic Chemistry
(D) Bio Chemistry
Answer: (A) Organic Chemistry
________ is the best disinfectant:
(A) Bromine
(B) Fluorine
(C) Chlorine
(D) Iodine
Answer: (C) Chlorine