Neco Chemistry Past Questions and Answers

Question 101:

• NECO 2008

In which of these groups will all the substances be insoluble in water?

A. Na₂CO₃, KNO₃,(NH₄)₂C0₃
B. NaHCO₃, PbSO₄, CaSO₄
C. K₂C0₃, CaSO₄, AgNO₃
D. PbCl₂, NaCl, ZnCl₂
E. ZnCO₃, BaSO₄,AgCl

Question 102:

• NECO 2008

In which of the following equations can Le-chartelier’s principle be applied?

A. H₂(g)+S(g) → H₂(g)
B. 2H₂S(g) + O₂ (g) → 2H2O(l) + 2SO₂(g)
C. N₂(g) +3H₂(g)
⇌ 2NH₃(g)
D. NaOH(aq) +CO₂(g) → Na₂CO₃(aq) + H₂O(l)
E. S(s) + 0₂(g) → SO₂(g)

Question 103:

• NECO 2008

The type of reaction ethyne mainly undergoes is ____________

A. Addition
B. Carboxylation.
C. Esterification
D. Saponification
E. Substitution

Question 104:

• NECO 2008

Which of the following laws is obeyed If at constant temperature, 200cm of hydrogen at 1.5 × 10m⁵Nm^-2pressure becomes 300cm³ at 1.0 × 10⁵Nm^-2 pressure?

A. Avogadro’s
B. Boyle’s
C. Charles’
D. Faraday’s
E. Graham’s

Question 105:

• NECO 2008

Chlorine atom forms Cl- by ____________

A. Donating lone pair of electrons
B. Gaining an electron
C. Losing an electron
D. Sharing an electron
E. Sharing a lone pair of electrons.