Calcination is used to convert zinc carbonate into zinc oxide. But cuprous sulphate is converted into cuprous oxide by roasting: What is the difference between calcination and roasting?

Write the difference between calcination and roasting .

Calcination isused to convert zinc carbon- ateinto zinc oxide. But cuproussulphate is converted into cuprousoxide by roasting: What happens to the ore when it is subjected to calcination?

Concentrated Cu_2S is converted into oxide by roasting. Write the process of roasting.

Giving examples, differentiate between 'roasting' and 'calcination'.

Why is zinc not extracted from zinc oxide through reduction using CO?

Concentrated Cu_2S is converted into oxide by roasting. How impurities like sulphur and phosphorus are removed in this process?

Which of the following statements are wrong? i) Calcination is mainly used for carbonate ore to get its oxide ii) Hydrated ore and hydroxides become anhydrous by calcination iii) Impurities like S, As and Sb are removed in the form of elemental vapours by calcination iv) Roasting is an endothermic process v) Roasting is mainly applicable for sulphide ore to get its oxide vi) Some times as a result of roasting, higher oxidation state oxide gets converted into lower oxidation state oxide.

a) What are the changes that can be observed with the iron rod and the color of copper sulphate solution if iron rod is dipped in copper sulphate solution? b) Write the equation of the oxidation and reduction reactions. c) What will be the change if silver rod is used instead of iron rod? What is the reason?

Consider the following metallurgical processes in 1. Heating impure metal with CO and distilling the resulting volatile carbonyl boiling point 43^@C and finally decomposing at 150^@ to 200^@C to get the pure metal. II. Heating the sulphide ore in air until a part is converted to oxide and then further heating in the absence of air to let the oxide react with unchanged sulphide. III. Electrolysing the molten electrolyte containing approximately equal amounts of the metal chloride and CaCl_2 to obtain the metal. The processes used for obtaining sodium, nickel and copper are respectively