Chemistry Question Bank

Assertion: Equivalent weight of a base molecular weight = acidity Reason: Acidity is the number of replaceable hydrogen atom in one molecule of the base.

Assertion :Both  12g  of  carbon  and  27g  of aluminium contain 6.023 × 1023 atoms. Reason :Molar  mass  of  an  element  contains Avogadro number of atoms.

Assertion :Pure water obtained from different states of India always contains hydrogen and oxygen in the ratio of 1 : 8 by mass. Reason: Total mass of reactants and products during chemical change is always the same.

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

The two most abundant metals in the earth crust 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…

Among the following statements, the incorrect one is:

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

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

The chemical composition of ‘slag’ formed during the smelting process in the extraction of copper is

Boron can be obtained by various methods but not by:

Select correct statement:

Which of the following factors is of no significance for roasting sulphide ores to the oxides and not subjecting the sulphide ores to carbon reduction directly

Formation of metallic copper from the sulphide ore in the commercial metallurgical process involves. (a) Cu S⁺ O Cu O+SO ; Cu O+C 2Cu+CO → → (b) Cu S O Cu O SO ; 2Cu O Cu S 6Cu SO → → (c) Cu S 2O CuSO ; CuSO Cu S 3Cu …

Which of the following pair of ores cannot be converted into corresponding metals by pyrometallurgy?

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

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