Chemistry 2003 Neco Past Questions and Answers

Question 31 :

• NECO 2003

The reaction C₂H₆ → C₂H + H₂ is known as ____________

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

Question 32 :

• NECO 2003

Which is NOT a synthetic polymer?

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

Question 33 :

• 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 34 :

• 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

Question 35 :

• NECO 2003

Which formula is used to indicate the degree of acidity of an acid?

A. \( [H^+] = ^{\text{mass of acid relative}} molecular mass of acid \)
B. F = number of H+ = ions x molar mass of the acid
C. Kw = [H+][OH-]
D. PH = - log₁₀[H+]
E. PKa = -log₁₀Ka