WAEC Chemistry Past Questions & Answers - Page 21

101.

The IUPAC nomenclature of the structure is?

A.

3-chloro-3-methylbutane

B.

2,2,-dichloro-3-methylbutane

C.

3-methylchlorobutane

D.

2-chloro-2-methylbutane

Correct answer is D

Straight-chain hydrocarbon molecules that contain only singly-bonded carbons are called alkanes.

When naming these molecules, the final syllable in their name is "ane."

  1. Find and name the longest continuous carbon chain.
  2. Identify and name groups attached to this chain.
  3. Number the chain consecutively, starting at the end nearest a substituent group.
  4. Designate the location of each substituent group by an appropriate number and name.

102.

Which of the following scientists discovered the electrons?

A.

Joseph J. Thompson

B.

James Chadwick

C.

Amedeo Avogadro

D.

Ernest Rutherford

Correct answer is A

No explanation has been provided for this answer.

103.

A coordinate covalent bond could be formed between?

A.

NH\(_{3}\) and PCl\(_{3}\)

B.

BCl\(_{3}\) and AlCl\(_{3}\)

C.

BCl\(_{3}\) and NH\(_{3}\)

D.

H\(^{+}\) and AlCl\(_{3}\)

Correct answer is C

A coordinate covalent bond, also known as a dative bond, dipolar bond, or coordinate bond is a kind of two-center, two-electron covalent bond in which the two electrons derive from the same atom. 

104.

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.

105.

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

A.

Br\(_{2}\) will oxidize CI\(^{-}\)

B.

F\(_{2}\) has the least tendency to be reduced

C.

Cl\(_{2}\) will oxidize I\(^{-}\)

D.

l\(_{2}\) is a stronger oxidizing agent than F\(_{2}\)

Correct answer is B

No explanation has been provided for this answer.