iGCSE Ions, formulae and acids

Which of the following is incorrect?

• acid + metal carbonate -> salt + carbon dioxide + water

• acid + alkali -> salt + water

• acid + metal -> salt + water

• acid + base -> salt +water

The formulae of the salt formed when sulfuric acid reacts with aluminium hydroxide is...

• Al₂(SO₄)₃

• Al₃(SO₄)₂

• AlSO₄

• Al₂SO₄

What is the formula of a sodium ion

• Na⁺

• Na²⁺

• Na^-

• Na^-2

What is the formula of a lithium ion

• Li⁺

• Li²⁺

• LI⁺

• Li^-

What does an acid release in aqueous solution?

• H

• H⁺

• OH^-

• H^-

What is the formula of a magnesium ion

• Mg²⁺

• Mg⁺

• Mg3⁺

• Mg^2-

What is the formula of a calcium ion?

• Ca²⁺

• C²⁺

• Ca⁺

• Ca^2-

What is the formula of an aluminium ion?

• Al³⁺

• Al²⁺

• Al⁴⁺

• Al

What is the formula of a chloride ion

• Cl^-

• Cl⁺

• Cl^2-

• Cl²⁺

What is the formula of an oxide ion?

• O^2-

• OH^-

• O^-

• OH^2-