ACIDS, BASES and SALTS - Introduction

The actual change which occurs when sodium hydroxide solution reacts with sulfuric acid is:

• 2Na⁺(aq) + SO₄^2-(aq) --> Na₂SO₄ (aq)

• OH^-(aq) +H⁺(aq) --> H₂O(l)

• 2NaOH (aq) + H₂SO₄ (aq) --> Na₂SO₄ (s) + 2H₂O (l)

• NaOH(aq) + H₂SO₄ (aq) --> Na₂SO₄ (aq) + H₂O (l)

Which of the following is not an amphoteric substance?

• Lead (II) oxide

• Aluminium hydroxide

• iron (III) oxide

• zinc hydroxide

Sulfuric acid is a stronger acid than ethanoic acid (acetic acid) in aqueous solution because sulfuric acid

• is more corrosive than ethanoic acid

• is more concentrated than ethanoic acid

• ionizes to a greater extent than ethanoic acid

• causes sugar to char whereas ethanoic acid does not

An acid can be defined as

• proton donor

• neutron acceptor

• proton acceptor

• neutron donor

A salt was heated with certain base. the gas evolved turned moist red litmus paper blue. Which of the following ions does the salt contain?

• nitrate (V)

• Ammonium

• sulfate (VI)

• carbonate

The following graph which shows the variation of the pH of the mixture formed when solution Y is added to a fixed volume of solution.

Which of the following pairs of substances can represent solution X and Y?

• X: HCl (aq) Y: H₂O

• X: KOH (aq) Y: H₂O

• X: HCl (aq) Y: KOH

• X: KOH (aq) Y: HCl (aq)

Which of the following oxides may show both acidic and basic properties?

• iron(II) oxide

• sodium oxide

• calcium oxide

• aluminium oxide

The pH of fresh sugar cane juice, which is usually 5.0-5.5, can be changed to 7.5 - 8.0 for more efficient processing by adding

• acetic (ethanoic) acid, CH₃CO₂H

• sodium chloride, NaCl

• slaked lime, Ca(OH)₂

• limestone, CaCO₃

Which of the following oxides react with both acids and bases?

• MgO

• CuO

• PbO

• CaO

When a piece of magnesium ribbon is burnt in magnesium oxide is formed. It is then placed in water and tested with litmus solution, which turned blue.

The above experiment shows that magnesium oxide is

• acidic

• basic

• neutral

• insoluble