Chemistry Question Bank

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 method of purification is represented by the following equation? Ti+2I TiI Ti+2I K K -> ->

Which of the following metals is refined by the van Arkel process?

In the froth-floatation process, the sulphide ores are concentrated by mixing the ore with

In the froth-floatation process, the ore particles float because

Sulphide ores are generally concentrated by the

Concentration of ores is not done by the

Silicon is the main constituent of

The ore of calcium which contains phosphorus is

The metal which mainly occurs as oxide ore in nature is:

Among the following, the most abundant metal in the earth’s crust is

The impurities present in a mineral are called

Which of the following statements is correct?

An element whose electronic configuration is 4s13d10. The possibility of element is

Assertion: In froth flotation process sodium ethyl xanthate is used as collector. Reason: Sulphide ores are water soluble.

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: 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.