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Chemistry questions and answers

Chemistry Questions and Answers

Learn more about the properties, composition, and structure of substances (elements and compounds) with these Chemistry questions and answers. This Test can be used by students preparing for Chemistry in JAMB, WAEC, NECO or Post UTME.

221.

Electrovalent compounds normally ------------

A.

have low boiling points

B.

have mobile electrons

C.

conduct electricity in the solid state

D.

dissolve in polar solvent

Correct answer is D

No explanation has been provided for this answer.

222.

Which of the following statements about elements in Group VII is correct?

A.

Br2 will oxidize CI

B.

F2 has the least tendency to be reduced

C.

Cl2 will oxidize I

D.

l2 is a stronger oxidizing agent than F2

Correct answer is B

No explanation has been provided for this answer.

223.

Which of the following pairs of molecules form hydrogen bonds?

A.

C2H5OH and CH3OH

B.

CH3OH and H2

C.

H2S and CH4

D.

NH3 and SO2

Correct answer is A

In alcohols the hydrogen bond is formed due to the covalent bonds between one oxygen atom and one hydrogen atom in the hydroxyl group (O—H).

224.

The isotopes of neon are represented by the symbols 20x Ne, 21 y Ne, and 22 z Ne. The relationship between x, y, and z is?

A.

x > y > z

B.

x < y < z

C.

x = y= z

D.

x < z < y

Correct answer is C

No explanation has been provided for this answer.

225.

How many molecules of oxygen would occupy a volume of 2.24 cm3 at s.t.p?

[Molar volume at s.t.p = 22,400 cm3, Avogadro's number = 6.02 x 1023]

A.

3.01 x 1020

B.

3.01 x 1027

C.

6.02 x 1019

D.

6.02 x 1027

Correct answer is C

No explanation has been provided for this answer.