Neco Chemistry Past Questions and Answers

Question 71:

• NECO 2003

The boiling point of water is higher than the boiling point of ethanol because ____________

A. The bonding in water is electrovalent (ionic) whereas the bonding in ethanol is convalent
B. The hydrogen bonding between water molecules is stronger than the hydrogen bonding between ethanol molecules
C. Water has a higher lattice energy than ethanol.
D. Water has hydrogen bonding between its molecules but ethanol has no hydrogen bonging between its molecules;
E. Water is a better solvent than ethanol.

Question 72:

• NECO 2003

The reaction C₂H₆ → C₂H + H₂ is known as ____________

A. Dehydration
B. Dehydrogenation
C. Displacement
D. Hydrogenation
E. Reduction

Question 73:

• NECO 2003

Which is NOT a synthetic polymer?

A. Nylon
B. Orion
C. Perspex
D. Polystyrene
E. Wool

Question 74:

• NECO 2003

A calcium atom and a calcium ion have the same ____________

A. Chemical properties
B. Electric charge
C. Electronic structure
D. Number of electrons
E. Number of neutrons

Question 75:

• NECO 2003

Which compound will give propane when it Is dehy drated by an excess of hot, concentrated tetraoxosvlphate(VI) acid?

A. CH₃CH₂CHO
B. CH₃CH₂CH2OH
C. CH₃CH₂COQH
D. CH₃CH₂0CH
E. CH₃CH₃OH