Q1: The product (s) of roasting of a sulphide ore is (are)

ANS:A - oxide only.

The product(s) of roasting of a sulphide ore depend on several factors, including the temperature and the partial pressure of oxygen and sulphur dioxide present during the roasting process. However, typically, the primary products of roasting a sulphide ore are oxides and sulphates.

1. Oxides: Some of the sulphide minerals in the ore may be oxidized to form oxides. For example, if the sulphide ore contains iron sulphide (FeS2, pyrite), it can be roasted to produce iron oxide (Fe2O3, hematite) and sulphur dioxide (SO2).
2. Sulphates: Depending on the conditions of roasting, some sulphide minerals may react with oxygen and/or sulphur dioxide to form sulphates. For instance, if the ore contains zinc sulphide (ZnS, sphalerite), it can be oxidized to form zinc oxide (ZnO) and zinc sulphate (ZnSO4).

The exact composition of the products formed during roasting can vary based on factors such as the composition of the ore, the roasting temperature, the duration of roasting, and the presence of other impurities or minerals in the ore. Therefore, the products of roasting are not fixed and can be influenced by the specific conditions of the roasting process.