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Chemistry Past Questions and Answers

Neco Chemistry Questions

Question 101:

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

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

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Question 102:

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

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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)

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Question 103:

The type of reaction ethyne mainly undergoes is ____________

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A Addition
B Carboxylation.
C Esterification
D Saponification
E Substitution

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Question 104:

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?

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

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Question 105:

Chlorine atom forms Cl- by ____________

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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.

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