Chemistry 2008 Neco Past Questions and Answers

Question 6 :

• NECO 2008

The following acids are monobasic EXCEPT

A. Dioxonitrate (Ill) acid
B. Ethanedioic acid
C. Hydrobromic acid
D. Methanoic acid
E. Oxochlorate (I) acid

Question 7 :

• NECO 2008

Which of these arrangement of elements is in order of increasing ionization energy?

A. Boron, Carbon, Flourine, Nitrogen
B. Boron, Carbon, Nitrogen, Flourine
C. Carbon, Boron, Nitrogen, Flourine
D. Flourine, Nitro9en, Carbon, Boron
E. Nitrogen, Flourine, Carbon, Boron

Question 8 :

• NECO 2008

The gas in air used by plants for photosynthesis is ____________

A. Argon
B. Carbon (IV) oxide
C. Nitrogen
D. Oxygen
E. Water vapour.

Question 9 :

• NECO 2008

When sodium hydroxide solution is added to a solution of zinc salt, the white precipitate formed re-dissolve in excess sodium hydroxide because ____________

A. Sodium hydroxide is a strong alkali
B. Sodium is more reactive than zinc
C. Zinc is more reactive than sodium
D. Zinc hydroxide is amphoteric
E. Zinc hydroxide is unstable

Question 10 :

• NECO 2008

A chemical system is at equilibrium when ____________

A. δ G is positive
B. δ G is zero
C. δ S is negative
D. δ S is positive
E. δ S is zero.