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Problem Solving Assessment(PSA)

Question-1
The formula of hydrogen sulphide is

(A) HS	(B) H₂S
(C) H₃S	(D) HS₃

Question-2
A group of atoms carrying a charge is known as

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

Question-3
The scientist who first use the symbols for elements in a very specific sense.

(A) John Dalton	(B) Rutherford
(C) Charles	(D) Boyle

Question-4 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-5
The formula of hydrogen chloride is

(A) HCl	(B) HClO
(C) HCl₂	(D) H₂Cl₂

Question-6
The ratio of given number of particles to Avogadro number gives

(A) Number of moles	(B) Atomic number
(C) Molecular mass	(D) Atomic mass

Question-7
A symbolic representation of composition of a compound is

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

Question-8
Atoms are indivisible particles, which cannot be created or destroyed in a chemical reaction.The law is

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

Question-9
The most remarkable concept that Dalton's atomic theory proposed was that of the

(A) Atomic mass	(B) Molecular mass
(C) Chemical properties	(D) Physical properties

Question-10
The building blocks of all matter are

(A) Atoms	(B) Molecules
(C) Elements	(D) Compounds

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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