Which of the following statements are true?
(i) Zinc blende is concentrated by magnetic separation process
(ii) Haematite is concentrated by gravity separation process
(iii) Aluminium is produced by the electrolytic reduction of fused alumina
(iv) Matte is a mixture of cupric sulphide and ferrous sulphide
(i) and (ii)
(i) and (iv)
(ii) and (iii)
(ii) and (iv)
Answer not known