Test: Refining of Crude Metals (Old NCERT) - NEET MCQ

Purification of aluminium is called 

The processes used in the refining of aluminium and zinc metals respectively are

van Arkel method of purification of metals involves converting the metal to

The most electropositive metals are extracted from their ores by

Which method of purification is represented by the following equation?

Which of the following process is used in the extractive metallurgy of magnesium?

In the electrolytic refining of copper using CuSO₄ as electrolyte the anod reaction is 

One or More than One Options Correct Type

Direction (Q. Nos. 11-15) This section contains 5 multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONE or MORE THAN ONE are correct.

Q. 

Which of the following is related to metal purification?

Which of the following are correctly matched?

Regarding blister copper incorrect statements are

Regarding electrolytic refining of silver which is correct?

In the chromatography method of purification of metals the adsorbent used in the column

Comprehension Type

Direction (Q. Nos. 16 and 17) This section contains a paragraph, describing theory, experiments, data, etc. Two questions related to the paragraph have been given. Each question has only one correct answer among the four given options (a), (b), (c) and (d).

Passage

Impure metals are purified by different methods in order to remove the undesired impurities. These methods depend on the nature of metal and nature of impurities. Liquation is used for purifying metals with low melting points like Bi, Sn, Pb, Hg etc. Distillation is used for volatile metals like Zn, Cd, Hg. Cupellation is used to purify silver metal with lead impurities. Electrolytic refining (Cu, Ag, Mg, Al) Zone refining (Si, Ge, Ga) Mond’s process (Ni) van Arkel process (Zr, Ti).

Q. 

In the extraction of nickel by Mond’s process, the metal is obtained by

Impure metals are purified by different methods in order to remove the undesired impurities. These methods depend on the nature of metal and nature of impurities. Liquation is used for purifying metals with low melting points like Bi, Sn, Pb, Hg etc. Distillation is used for volatile metals like Zn, Cd, Hg. Cupellation is used to purify silver metal with lead impurities. Electrolytic refining (Cu, Ag, Mg, Al) Zone refining (Si, Ge, Ga) Mond’s process (Ni) van Arkel process (Zr, Ti).

Q. 

Suggest a method of purification for obtaining highly pure solar grade silicon used as a semiconductor.

Matching List Type

Direction (Q. No. 18 and 19) Choices for the correct combination of elements from Column I and Column II are given as options (a), (b), (c) and (d), out of which one is correct.

Q. 

Match the Column I with Column II and mark the correct option from the codes given below.

Match the Column I with Column II and mark the correct option from the codes given below.

One Integer Value Correct Type

Direction (Q. Nos. 20-24) This section contains 5 questions. When worked out will result in an integer from 0 to 9 (both inclusive).

Q. 

In auto reduction process of copper, the part of cuprous sulphide is oxidised with cuprous oxide to form a free copper metal. The balanced equation is as follows 

Cu₂S + 2Cu2O → xCu + SO₂

The value of x is

The central atom in the stable volatile complex formed in the Mond’s method has the oxidation number

Number of ligands in the stable volatile complex formed during the extraction of Ni by Mond’s process.

Sea water contains 1297.3g of Mg²⁺ per metric ton. How much of slaked lime in kg, must be added to 1.0 metric ton of sea water to precipitate all of the Mg²⁺ ion?

The percentage impurity in 23 carat gold is nearly

Statement Type

Direction (Q. No. 25) This section is based on Statement I and Statement II. Select the correct answer from the codes given below.

Q. 

Satement I : In electrorefining process cathode is made up of a pure strip of the same metal.

Statement II : Blister copper contains 50% impurities.