19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
Among the following, the most abundant metal in the earth’s crust is
Which of the following statements is correct?
The impurities present in a mineral are called
Assertion: Lead, tin and bismuth are purified by liquation method. Reason: Lead, tin and bismuth have low m.p. as compared to impurities.
Assertion: Wrought iron is more malleable and ductile than steel. Reason: It contains slightly less percentage of carbon.
Assertion: In the electrolytic reduction of Al2O3, cryolite is used. Reason: Cryolite is an ore of aluminium.
Assertion: CuFeS2 is concentrated by froth floatation method. Reason: CuFeS2 is main ore of copper.
Assertion: Cryolite is used in electrolytic extraction of Al from alumina. Reason: It dissolves alumina.
Assertion: In froth flotation process sodium ethyl xanthate is used as collector. Reason: Sulphide ores are water soluble.
Assertion: Thermite mixture Fe2O3+ Al (powder) is used in the welding. Reason: Al is a good reductant.
Assertion: In the extraction of Ag, complex Na [Ag (CN)2] is reacted with Zn. Reason: Zn is d-block transition metal.
Assertion: Ores are generally converted into oxides, prior to reduction. Reason: Metal oxides can be easily reduced.
Assertion: Extraction of iron metal from iron oxide ore is carried out by heating with coke. Reason: The reaction, Fe O (s) Fe(s)+ O (g) -> is a spontaneous process.
Which of the following statements is correct about [Y]?
The metal ores [X] and [Y] are respectively:
Which of the following is not correctly matched?
Boron can be obtained by various methods but not by:
Among the following statements, the incorrect one is:
Carbonate of which of the following metal does not liberate carbon dioxide on heating:
The chemical composition of ‘slag’ formed during the smelting process in the extraction of copper is
The two most abundant metals in the earth crust are:
The maximum temperature that can be achieved in blast furnace is: (NEET 2021)
Which one of the following methods can be used to obtain highly pure metal which is liquid at room temperature? (NEET 2021)
Identify the correct statement from the following: (NEET 2020)
Which of the following has maximum iron content? (AIIMS 2019)