10 (a) Acid, Base

An element X forms an oxide which dissolves both in acids and in alkalis.

What could X be?

• aluminium

• calcium

• copper

• iron

Which representation of dilute sulfuric acid is correct?

• H₂(aq) + SO₄^2-(aq)

• 2H+(aq) + SO₄^2-(aq)

• 2H+(aq) + SO₄^-(aq)

• H₂SO₄(ℓ)

Which one of the following elements burns in air to form an oxide which, when shaken with water, gives a solution with a pH greater than 7?

• carbon

• copper

• hydrogen

• magnesium

An element is burned in an excess of oxygen. Which statement about the oxide formed is always correct?

• It is crytalline solid.

• It is greater in mass than the element.

• It is soluble in water.

• It is white in colour.

In which reaction is dilute sulfuric acid not be having as an acid?

• H₂SO₄ + 2NaOH → Na₂SO₄ +2H₂O

• H₂SO₄ + BaCI₂ → BaSO₄ + 2HCI

• H₂SO₄ + CuO → CuSO₄ + H₂O

• H2SO4 + Mg → MgSO₄ + H₂

Which substance does not produce copper(II) sulfate when added to dilute sulfuric acid?

• copper

• copper(II) carbonate

• copper(II) hydroxide

• copper(II) oxide

Which of the following is a reaction of dilute hydrochloric acid?

• Ammonium chloride reacts to give ammonia.

• Calcium carbonate reacts to give carbon dioxide

• Copper reacts to give hydrogen.

• Universal Indicator paper turns blue.

Which pair of substances would not be suitable for producing a large quantity of carbon dioxide?

• copper(II) carbonate and nitric acid

• lead(II) carbonate and sulfuric acid

• sodium carbonate and hydrochloric acid

• zinc carbonate and sulfuric acid

The pH of an aquaeous solution of hydrochloric acid is 2.

What will be the pH of the acid after the addtion of 10g of sodium chloride?

• 1

• 2

• 7

• 9

Which observation most strongly suggests that a solid element X is a non metal?

• X forms an acidic oxide.

• X has a high melting point.

• X is a conductor of electricity

• X reacts vigorously with chlorine.