Andhra Pradesh (English Medium) Std 9 Study Materials, Online Learning, Question Papers, Classnotes, Practice Test, MCQ | Smartindia Educational Program : www.smartindia.net.in

Question-1
Law of combining volumes was proposed by

(A) Avogadro	(B) Einstein
(C) Gaylussac	(D) Berzelius

Question-2
Avogadro Number is

(A) 6.02 atoms	(B) 6.023 x 10²³atoms
(C) 6.023 x 10²⁴atoms	(D) 6.023 x 10²²atoms

Question-3
The reactions in which heat is evolved is

(A) exothermic	(B) endothermic
(C) displacement	(D) combination

Question-4
The relative molecular mass of a substance is expressed in

(A) grams	(B) kilograms
(C) mole	(D) kilo joules

Question-5
Atomic theory was proposed by

(A) John Dalton	(B) Avogadro
(C) Berzelius	(D) Einstein

Question-6
The catalyst used in the decomposition of potassium chlorate

(A) MnO₃	(B) Mn
(C) O₂	(D) MnO₂

Question-7 When CaCO₃ is heated, the gas liberated is

(A) CO₂	(B)O₂
(C)H₂	(D)N₂

Question-8
The reactions which take place only with the absorption of electrical energy are called

(A) electrochemical reactions	(B) chemical combination
(C) redox reaction	(D) ionization reaction

Question-9
A chemical equation in which number of atoms of each element is same on both the sides of a chemical reaction is

(A) balanced equation	(B) chemical formula
(C) symbol	(D) equation

Question-10
When electric current is passed through acidified water, it decomposes to

(A) H₂ & O₂	(B) Cl₂ and O₂
(C) H₂ and Cl₂	(D) N₂ and H₂

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Std 9

Andhra Pradesh (English Medium)

Practice in Related Chapters
Chemical Bonding
Behaviour of Gases
Atomic Structure
Metallurgy
Rates of Reactions
Chemical Calculation
Energetics