19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
The cyanide process is used for the extraction of
Which of the following is a sulphide ore?
Blister copper is refined by stirring molten impure metal with green logs of wood because such a wood liberates hydrocarbon gases (like CH₄). This Process X is called .......... and the metal contains impurities of Y …
In the extraction of Fe from Fe₂O₃, the reducing agent is
Which of the following reactions taking place in the blast furnace during extraction of iron is endothermic?
Which of the following minerals does not contain iron?
During the extraction of iron, slag produced is
Which of the following mixtures is called matte?
Blister copper is obtained in
In the extraction of iron, Fe₂O₃ is reduced by
Which of the following is also known as “Fools gold”?
In the equation, 4M+8CN– + 2H₂O + O₂ → 4 [M(CN)₂]– + 4OH–, the metal M is
Ultrapure silicon, used to make semiconductors, is obtained by the
Impure nickel is purified by
Which of the following reactions represents the self- reduction process? (a) (b) (c)
Which method of purification is represented by the following equation? Ti+2I TiI Ti+2I K K → →
Wolframite (FeWO₄), present as an impurity in cassiterite (SnO₂), can be removed by the process of
The ore of calcium which contains phosphorus is
The van Arkel method for purification of metals involves the conversion of the metal into a
Which of the following metals is refined by the van Arkel process?
The liquation process is used for the purification of
Which of the following pair is incorrectly matched?
Which of the following reactions represents the self- reduction process? (a) (b) (c)
Thomas slag is
The maximum temperature that can be achieved in blast furnace is: (NEET 2021)