Neco Chemistry Past Questions and Answers

Question 151:

• NECO 2009

Compound with the general formula C_nH_2n2 belong to the ____________ group

A. Alkanal
B. Alkane
C. Alkanoate
D. Alkene
E. Alkyne

Question 152:

• NECO 2009

Which of the following non-metals reacts most readily with metals?

A. Carbon
B. Chlorine
C. Nitrogen
D. Phosphorus
E. Sulphur

Question 153:

• NECO 2009

The percentage composition of a hydrocarbon is 79.2 carbon 20.8 hydrogen. Calculate its empirical formula [H = 1, C = 12]

A. CH
B. CH₃
C. CH₄
D. C₂H₂
E. C₂H₆

Question 154:

• NECO 2009

The following compounds decolorize acidified potassium tetraoxomanganate (VII) solution EXCEPT

A. HOCH₂ – CH₂OH
B. H₂C –C =C– CH₃
C. H₃C – HC = CH₂
D. H₂C = CH₂
E. H₃C – C =CH

Question 155:

• NECO 2009

The scientist who discovered the zig-zag movement of gas molecules is ____________

A. Brownian
B. Dalton
C. Gay Lussac
D. Graham
E. Newton