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Problem Solving Assessment(PSA)

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Question-1
It is used to find out how the atoms of an element will combine with the atoms of another element to form a chemical compound.

(A) Valency	(B) Atomicity
(C) Ions	(D) Formula

Question-2 10.0g of CaCO₃ on heating gave 4.4g of CO₂ and 5.6 g of CaO. The observation is in agreement with the

(A) Law of constant composition	(B)Law of conservation of mass
(C)Law of definite proportion	(D)Law of multiple proportion.

Question-3
Smallest particle of an element or a compound that is capable of an independent existence and shows all the properties of that substance is

(A) A molecule	(B) An atom
(C) Complex	(D) Mixture

Question-4 Which of the following is not a monoatomic substance?

(A) Argon	(B)Neon
(C)Helium	(D)Nitrogen

Question-5
A symbolic representation of composition of a compound is

(A) Chemical formula	(B) Empirical formula
(C) Abstracted formula	(D) Mathematical formula

Question-6
A group of atoms carrying a charge is known as

(A) Cation	(B) Anion
(C) Ion	(D) Polyatomic ion

Question-7 An atom is the

(A) smallest particle of matte known	(B)smallest particle of a gas
(C)smallest indivisible particle of an element that can take in a chemical change	(D)radioactive emission

Question-8
Formula of aluminium oxide is

(A) AlO₂	(B) Al₂O₂
(C) Al₂O₃	(D) Al₂O₄

Question-9
The formula of hydrogen sulphide is

(A) HS	(B) H₂S
(C) H₃S	(D) HS₃

Question-10
All matter is made up of very tiny particles called atoms.This is according to

(A) Avogadro's theory	(B) Dalton's atomic theory
(C) Boyle's law	(D) Charles law

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Std 9

CBSE

Practice in Related Chapters
Matter In Our Surroundings
Is Matter Around Us Pure
Atoms And Molecules
Structure Of The Atom

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