JAMB Chemistry Past Questions & Answers - Page 255

1,271.

An example of aromatic compound is?

A.

C6H13OH

B.

C6H13CI

C.

C6H5OH

D.

C6H14

Correct answer is C

No explanation has been provided for this answer.

1,272.

How many structural isomers can be drawn for the non-cyclic alkanol with molecular formula C 4H10O?

A.

1

B.

2

C.

3

D.

4

Correct answer is D

No explanation has been provided for this answer.

1,273.

On cracking medicinal paraffin, a gas is evolved which gives a pop sound with a lighted splinter and an oily liquid which decolourizes bromine solution is also obtained. The products of the cracking are ?

A.

carbon (IV) oxide and alkyne

B.

carbon (ll) oxide and alkene

C.

hydrogen gas and alkene

D.

hydrogen gas and alkane

Correct answer is C

No explanation has been provided for this answer.

1,274.

One mole of hydrocarbon contains 6g of hydrogen. If the molecular weight is 54, the hydrocarbon is an?

A.

alkanone

B.

alkane

C.

alkene

D.

alkyne

Correct answer is D

CxH6
∴ CxH6 = 54
12x + 6 = 54
12x = 54 - 6
12x = 48
x = (48)/(12)
x = 4
We have CxH6 butyne
A formular of alkyne

1,275.

Alloys are often used in preference to pure metals because?

A.

metals are too hard

B.

merals are ductile

C.

metallic properties are improve in alloys

D.

alloys are a mixture of metals

Correct answer is C

No explanation has been provided for this answer.