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Question (41)

QN006752

Isotopes are atoms having same —

(A) Mass number but different atomic number
(B) Atomic number but different mass number
(C) Number of neutrons and electrons
(D) Mass number and neutrons

Correct Answer: B

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Question (42)

QN006753

Which isotope of hydrogen contains two neutrons?

(A) Protium
(B) Deuterium
(C) Tritium
(D) Hydrogen-1

Correct Answer: C

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Question (43)

QN006754

Carbon-14 contains —

(A) 6 protons and 8 neutrons
(B) 14 protons and 6 neutrons
(C) 8 protons and 6 neutrons
(D) 6 protons and 14 neutrons

Correct Answer: A

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Question (44)

QN006755

Chemical properties of isotopes remain similar because isotopes have same —

(A) Number of neutrons
(B) Mass number
(C) Electronic configuration
(D) Physical state

Correct Answer: C

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Question (45)

QN006756

Which isotope is used in treatment of thyroid cancer?

(A) 14C
(B) 60Co
(C) 131I
(D) 235U

Correct Answer: C

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Question (46)

QN006757

Which isotope is commonly used as fuel in nuclear reactors?

(A) 14C
(B) 235U
(C) 131I
(D) 60Co

Correct Answer: B

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Question (47)

QN006758

The weighted average atomic mass of chlorine is 35.5 u because —

(A) Every chlorine atom has mass 35.5 u
(B) Isotopes occur in unequal abundance
(C) Chlorine has fractional neutrons
(D) Electrons add extra mass

Correct Answer: B

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Question (48)

QN006759

Bromine occurs as 79Br (49.7%) and 81Br (50.3%). Its average atomic mass is approximately —

(A) 79 u
(B) 80 u
(C) 81 u
(D) 79.5 u

Correct Answer: B

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Question (49)

QN006760

Atoms of different elements having same mass number are called —

(A) Isotopes
(B) Isomers
(C) Isobars
(D) Isoelectronic species

Correct Answer: C

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Question (50)

QN006761

Calcium, potassium and argon can act as examples of isobars because they may possess the same —

(A) Atomic number
(B) Number of electrons
(C) Number of protons
(D) Mass number

Correct Answer: D

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Question (41)

Isotopes are atoms having same —

Explanation:

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Question (42)

Which isotope of hydrogen contains two neutrons?

Explanation:

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Question (43)

Carbon-14 contains —

Explanation:

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Question (44)

Chemical properties of isotopes remain similar because isotopes have same —

Explanation:

Link:

Question (45)

Which isotope is used in treatment of thyroid cancer?

Explanation:

Link:

Question (46)

Which isotope is commonly used as fuel in nuclear reactors?

Explanation:

Link:

Question (47)

The weighted average atomic mass of chlorine is 35.5 u because —

Explanation:

Link:

Question (48)

Bromine occurs as 79Br (49.7%) and 81Br (50.3%). Its average atomic mass is approximately —

Explanation:

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Question (49)

Atoms of different elements having same mass number are called —

Explanation:

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Question (50)

Calcium, potassium and argon can act as examples of isobars because they may possess the same —

Explanation:

Link:

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