8(i)
Choose the correct answer from the list given below:
$\boxed{\text{zinc blende}, \text{C}_2\text{H}_2, \text{calamine, CH, haematite}}$
(a) The ore which can be concentrated by magnetic separation.
(b) Empirical formula of Ethyne.
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(a) Haematite
Reason — Haematite is an iron ore that can be concentrated by magnetic separation because it contains iron, which is magnetic.
(b) Molecular formula of Ethyne is C2H2. The simplest whole-number ratio of carbon to hydrogen in Ethyne is 1:1. Therefore, the empirical formula of Ethyne is CH.