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Problem Solving Assessment(PSA)

Question-1
The number of particles present in one mole of any substance is known as

(A) Avogadro constant	(B) Rydberg constant
(C) Joule constant	(D) Charles constant

Question-2
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-3
It was taken from the English word meaning yellow

(A) Copper	(B) Gold
(C) Platinum	(D) Iron

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 carbon tetrachloride is

(A) CCl₂	(B) CCl
(C) CCl₃	(D) CCl₄

Question-6
The charged species are known as

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

Question-7
The scientist who first use the symbols for elements in a very specific sense.

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

Question-8 A sample of pure water, irrespective of source, contains 88.89% oxygen and 11.11% hydrogen by mass. The data supports the

(A) Law of conservation of mass	(B)Law of constant composition
(C)Law of multiple proportions	(D)None of these

Question-9
Mass can neither be created nor destroyed in a chemical reaction.This is

(A) Law of constant proportion	(B) Law of conservation of mass
(C) Avogadro's law	(D) Boyle's law

Question-10
The symbol of sodium is

(A) S	(B) So
(C) Fe	(D) Na

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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