Acids, bases and salts - Jamb Chemistry Past Questions and Answers

Question 51:

• JAMB 1989

The substance ZnO dissolves in sodium hydroxide solution and mineral acid solution to give soluble products in each case. ZnO is therefore referred to as

A. An allotropic oxide
B. An amphoteric oxide
C. A peroxide
D. A dioxide

Question 52:

• JAMB 1989

An acid and its conjugate base

A. Can neutralise each other to form a salt
B. Differ only by a proton
C. Differ only by the opposite charges they carry
D. Are always neutral substances

Question 53:

• JAMB 1989

Which of the following represents the balanced equation for the reaction of copper with concentrated trioxonitrate (V) acid?

A. Cu _(s) + 2HNO _3(aq) → Cu (NO ₃) _2(aq) + H _2(g)
B. Cu _(s) + 4HNO _3(aq) → Cu (NO ₃) _2(aq) + 2H ₂O ₍₁₎ + 2NO _2(g)
C. 3Cu _(s) + 8HNO_3(aq) → 3Cu (NO₃)_2(aq) + 4H₂O₍₁₎ + 2NO_(g)
D. 3Cu_(s) + 4HNO_3(aq) → 3Cu(NO ₃) _2(aq) + 2H ₂O ₍₁₎ + 2NO _(g)

Question 54:

• JAMB 1989

Which of the following reactions is (are) feasible?
I Br ₍₁₎ + 2CI _2(aq) 2Br _(aq) + CI _2(g)
ll 21 _(aq) + Br ₂₍₁₎ 2Br _(aq) + 1 _2(s)
lll 2F _(aq) + CI _2(g) 2CI _(aq) + F _2(g) IV 2F _(aq) + Br ₂₍₁₎ 2Br _(aq) + F _2(g)

A. L
B. Ll
C. L and lll
D. Lll and lV

Question 55:

• JAMB 1990

The brown fumes given off when trioxonitrate (V) acid is heated consist of ?

A. NO₂ and O₂
B. H₂O and NO₂
C. NO_2' O₂ and H₂O
D. NO, NO₂ and H₂O