WAEC Chemistry Past Questions & Answers - Page 236

1,176.

If the atomic number of an element X is 11 and that of nitrogen is 7, the most likely formula of the nitride of X is

A.

X₃N

B.

XN₃

C.

X₃N₂

D.

N₂X

E.

NX₂

View answer & explanation

Correct answer is A

No explanation has been provided for this answer.

1,177.

A sodium atom and a sodium ion have the same

A.

number of neutrons

B.

number of electrons

C.

electric charge

D.

electronic structure

E.

chemical properties

View answer & explanation

Correct answer is A

No explanation has been provided for this answer.

1,178.

In linear molecules, the bond angle is

A.

90^o

B.

140^o

C.

109^o

D.

120^o

E.

180^o

View answer & explanation

Correct answer is E

No explanation has been provided for this answer.

1,179.

What is the most probable group of an element which is a soft, silvery white solid and reacts violently with water?

A.

Group 0

B.

Group 1

C.

Group 4

D.

Group 6

E.

Group 7

View answer & explanation

Correct answer is B

No explanation has been provided for this answer.

1,180.

Radon is used as a tracer in medical research because it

A.

is monatomic

B.

is radioactive

C.

is a noble gas

D.

has a complete valence shell

E.

has a low boiling point

View answer & explanation

Correct answer is B

No explanation has been provided for this answer.

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