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Question (31)

QN007092

Which of the following elements has valency 1?

(A) Potassium
(B) Magnesium
(C) Carbon
(D) Silicon

Correct Answer: A

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Question (32)

QN007093

Valency of an element with completely filled outer shell is —

(A) 1
(B) 2
(C) 4
(D) 0

Correct Answer: D

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Question (33)

QN007094

An atom has 3 valence electrons. Its valency is generally —

(A) 1
(B) 2
(C) 3
(D) 5

Correct Answer: C

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Question (34)

QN007095

Which of the following elements has valency 4?

(A) Silicon
(B) Sodium
(C) Fluorine
(D) Calcium

Correct Answer: A

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Question (35)

QN007096

The valency of helium is zero because it has —

(A) One shell
(B) Full outer shell
(C) No electrons
(D) No neutrons

Correct Answer: B

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Question (36)

QN007097

An atom with electronic configuration 2, 8, 4 has valency —

(A) 2
(B) 3
(C) 4
(D) 8

Correct Answer: C

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Question (37)

QN007098

Which pair of elements has the same valency?

(A) Sodium and potassium
(B) Oxygen and chlorine
(C) Nitrogen and fluorine
(D) Carbon and magnesium

Correct Answer: A

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Question (38)

QN007099

The valency of magnesium is determined by losing —

(A) 1 electron
(B) 2 electrons
(C) 6 electrons
(D) 8 electrons

Correct Answer: B

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Question (39)

QN007100

An atom has seven valence electrons. It requires how many electrons to complete octet?

(A) 1
(B) 2
(C) 3
(D) 7

Correct Answer: A

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Question (40)

QN007101

Which element has valency 3?

(A) Boron
(B) Oxygen
(C) Calcium
(D) Potassium

Correct Answer: A

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