Chemistry Question Bank

The methods chiefly used for the extraction of lead and tin from their ores are respective

Refining of impure copper with zinc impurity is to be done by electrolysis using electrodes as Cathode Anode

Which of the following reactions does not occur in Bessemer converter in the extraction of copper from chalcopyrites?

Silver is extracted from its native ore by:

Which of the following is not correctly matched?

The metal ores [X] and [Y] are respectively:

Which of the following statements is correct about [Y]?

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.

Assertion: Ores are generally converted into oxides, prior to reduction. Reason: Metal oxides can be easily reduced.

Assertion: In the extraction of Ag, complex Na [Ag (CN)₂] is reacted with Zn. Reason: Zn is d-block transition metal.

Assertion: Thermite mixture Fe₂O³⁺ Al (powder) is used in the welding. Reason: Al is a good reductant.

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

Assertion: Cryolite is used in electrolytic extraction of Al from alumina. Reason: It dissolves alumina.

Assertion: CuFeS₂ is concentrated by froth floatation method. Reason: CuFeS₂ is main ore of copper.

Assertion: Wrought iron is more malleable and ductile than steel. Reason: It contains slightly less percentage of carbon.

Assertion: Lead, tin and bismuth are purified by liquation method. Reason: Lead, tin and bismuth have low m.p. as compared to impurities.

Assertion: Al₂O₃ is converted into Al by reduction with carbon at high temp. Reason: Carbon has greater affinity for oxygen than aluminium.

Assertion: All the ores are mineral. Reason: Ores contains metals in combined state

Among the following statements, the incorrect one is:

Carbonate of which of the following metal does not liberate carbon dioxide on heating:

The two most abundant metals in the earth crust are:

During the process of electrolytic refining of copper, some metals present as impurity settle as ‘anode mud’. These are

Consider the following metallurgical processes: (I) Heating impure metal with CO and distilling the resulting volatile carbonyl (b.p. 430C) and finally decomposition at 1500-2000C to get the pure metal (II) Heating th…

Assertion: pH  of  water  increases  with  an  increase  in temperature. Reason: Kw  of  water  increases  with  increase  in temperature.

The  solubility  of  CaCO₃  is  7  mg/L.  Calculate  the solubility product of BaCO₃ from this information and from  the  fact that  when  Na₂CO₃  is added slowly  to  a solution  containing  equimolar  concentration …