1) The presence of an impurity in substance will cause the melting point to

A. be zero

B. reduce

C. increase

D. be stable

2) What volume of carbon (ll) oxide is produced by reacting excess carbon with 10 dm³ of oxygen?

A. 5 dm ³

B. 20 dm ³

C. 15 dm ³

D. 10 dm ³

3) The radioisotope used in industrial radiography for the rapid checking of faults in welds and casting is

A. carbon-14

B. phosphorus-32

C. cobalt-60

D. iodine-131

4) The shape of the carbon (lV) oxide molecule is

A. pyramidal

B. linear

C. angular

D. tetrahedral

5) Which of the following molecules is held together by hydrogen bond?

A. CH₄

B. HBr

C. H₂SO₄

D. HF

6) The coloured nature of transition metal ions are associated with their partially filled

A. f- orbital

B. s- orbital

C. p-orbital

D. d-orbital

7) Aluminium containers are frequently used to transport trioxonitrate (V) acid because aluminium

A. has a silvery-white appearance

B. has a low density

C. does not react with the acid

D. does not corrode

8) 2- methylpropan-2-ol is an example of a

A. dihydric alkanol

B. tertiary alkanol

C. secondary alkanol

D. primary alkanol

9) The reaction between ammonia and ethyl ethanoate produces

A. propanol and ethanamide

B. propanol and propanamide

C. ethanol and propanamide

D. ethanol and ethanamide

10) The decarboxylation of ethanoic acid will produce carbon (IV)oxide and

A. methane

B. ethane

C. propane

D. butane