Chemistry Past Questions and Answers

Which of the following metals will be the most suitable for use where lightness and resistance to corrosion are of importance?

A Lead
B Copper
C Iron
D Calcium
E Aluminium

Question 1527:

What amount of copper is deposited when 13.0g of zinc reacts with excess copper (ll) tetraoxosulphate (IV) solution according to the following equation? Zn _(s) + CuSO_4(aq) â†’ ZnSO_4(aq) + Cu _(s) [Cu =63,5, Zn = 65]

A 0.1 mole
B 0.2mole
C 0.3 mole
D 0.4 mole
E 0.5 mole

Question 1528:

The products formed when sodium hydrogen trioxocarbonate (IV) is heated strongly are

A Carbon (IV) oxide and sodium hydride
B Carbon (IV) oxide and soudium trioxocarbonate (IV)
C Sodium trioxocarbonate (IV) and steam
D Carbon (IV) oxide and steam
E Sodium trioxocarbonate (IV) carbon (IV) oxide and steam

Question 1529:

The following are properties of transition metals except

A Variable oxidation states
B Tendency to form complext ions
C Formation of coloured ions
D Ability to act as catalyst
E Low melting points

Question 1530:

The following salts will produce a gas on reacting with hydrochloric acid except

A CuSO₄
B CaCO₃
C FeS
D Na₂SO₃
E K₂CO₃