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List of top Chemistry Questions on Concentration of ores

Siderite is mainly ore of
Sodium cyanide is added as a depressant in the froth floatation process when the ore contains a mixture of $ {ZnS}$ and $ {PbS}$. This is because
The ore chromite is
The substance used as froth stabilisers in forth-floatation process is
Which of the following reaction is an example of calcination process?
During smelting an additional substance is added which combines with impurities to form a fusible product which is known as
The auto reduction process is not used in the metallurgy of
The ore that is concentrated by Froth Floatation process is
Which of the following metal is correctly matched with its ore?
The metallurgical process in which a metal is obtained in a fused state is called
Non-oxide ceramics can be
Sulphide ores of metals are usually concentrated by froth floatation process. Which one of the following sulphide ores offers an exception and is concentrated by chemical leaching?
The ratio of $Fe _{2} O _{3}$ and $Al$, in thermite is:
Which of the following is not an ore of magnesium?
Which of the following statements is incorrect?
The methods chiefly used for the extraction of lead and tin from their ores are respectively
The sulphide ore of copper is concentrated by:
Bauxite is concentrated by :
Solder is an alloy of:
The iron-carbonate ore is:
The important ore of aluminium is

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R
Assertion (A) : For extraction of Iron haematite ore is used. 

Reason (R) : Because haematite is carbonate ore.

In the light of the above statements, choose the correct answer from the options given below

The substance used as an activator in froth floatation process is
The reaction $Cr_2O_3 + 2Al \to Al_2O_3 + 2Cr (\Delta G^? = - 421\, kj)$ is thermodynamically feasible due to -ve value of $\Delta G$. Why does this reaction not take place at room temperature?
The process to remove unwanted impurities from the ore is called -

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