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Question (11)

QN006972

The mass number of carbon-12 is —

(A) 6
(B) 12
(C) 18
(D) 24

Correct Answer: B

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Question (12)

QN006973

An atom has 18 protons and 22 neutrons. Its mass number is —

(A) 18
(B) 22
(C) 40
(D) 4

Correct Answer: C

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Question (13)

QN006974

Which quantity is obtained by adding protons and neutrons?

(A) Atomic number
(B) Valency
(C) Mass number
(D) Atomic mass unit

Correct Answer: C

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Question (14)

QN006975

An atom has mass number 35 and atomic number 17. Number of neutrons present is —

(A) 17
(B) 18
(C) 35
(D) 52

Correct Answer: B

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Question (15)

QN006976

The particles collectively responsible for mass number are called —

(A) Electrons
(B) Ions
(C) Nucleons
(D) Isobars

Correct Answer: C

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Question (16)

QN006977

Which of the following atoms has mass number 23?

(A) 11 protons and 11 neutrons
(B) 12 protons and 12 neutrons
(C) 11 protons and 12 neutrons
(D) 10 protons and 13 neutrons

Correct Answer: C

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Question (17)

QN006978

The mass number of an atom is never —

(A) Whole number
(B) Positive integer
(C) Smaller than atomic number
(D) Equal to atomic number

Correct Answer: C

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Question (18)

QN006979

An atom contains 26 protons and 30 neutrons. Calculate its mass number.

(A) 26
(B) 30
(C) 56
(D) 4

Correct Answer: C

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Question (19)

QN006980

Which statement is false regarding mass number?

(A) It includes neutrons
(B) It includes protons
(C) It includes electrons
(D) It is represented by A

Correct Answer: C

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Question (20)

QN006981

The mass number of sodium atom having 11 protons and 12 neutrons is —

(A) 11
(B) 12
(C) 23
(D) 1

Correct Answer: C

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