General Princip...

Which mineral is common to the ores carnallite, magnesite and dolomite?

The ore of tin containing FeCrO₄ can be concentrated by

All sulphide ores are extracted by froth floatation method except

What is the process of isolation of a metal by dissolving the ore in a suitable electrolyte, followed by precipitation of the metal by displacement by a more electropositive metal called?

Consider the following statements:

I. In the precipitation of Ag from sodium dicyano argentate (I), zinc acts as the reducing agent as well as a complexing agent.
II. In the process of roasting, the copper pyrite is converted into mixture of Cu₂S and FeS, which are then partially oxidised.
III. Tin and lead are extracted from their ores by self reduction method.

Which of the above statements is/are false?

Consider the following statements independently regarding the formation of slag obtained during the extraction of metals like copper and iron and choose the appropriate answer accordingly.

I. The slag is lighter and has a lower melting point than the metal.
II. The slag is formed by the combination of the impurity with a flux.
III. The flux added during the extraction of iron from its oxide is basic.

The reducing agent in the process of smelting is