19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
Which of the following changes take place during roasting?
The main function of roasting is
Out of the following metals that cannot be obtained by electrolysis of the aqueous solution of their salts is
Which of the following reactions represents the self- reduction process? (a) (b) (c)
Thomas slag is
Which of the following reactions represents the self- reduction process? (a) (b) (c)
Which of the following pair is incorrectly matched?
The liquation process is used for the purification of
The anode mud in the electrolytic refining of silver contains:
Which of the following metals is refined by the van Arkel process?
The van Arkel method for purification of metals involves the conversion of the metal into a
Which method of purification is represented by the following equation? Ti+2I TiI Ti+2I K K → →
Impure nickel is purified by
Ultrapure silicon, used to make semiconductors, is obtained by the
In the equation, 4M+8CN– + 2H₂O + O₂ → 4 [M(CN)₂]– + 4OH–, the metal M is
Which of the following is also known as “Fools gold”?
In the extraction of iron, Fe₂O₃ is reduced by
Blister copper is obtained in
Which of the following mixtures is called matte?
During the extraction of iron, slag produced is
Which of the following minerals does not contain iron?
Copper is extracted from sulphide ore using the method:
Which of the following reactions taking place in the blast furnace during extraction of iron is endothermic?
In the extraction of Fe from Fe₂O₃, the reducing agent is
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 …