Revisal Problems (Past 13 Year) JEE Advanced (Metallurgy) - Class 12 MCQ

Which of the following is froth stabilizer in froth floatation process?

Sulphide ores of metals are usually concentrated by froth floatation process. Which one of the following sulphide ores offers an exception and is concentrated by leaching?

The process used in refining blister copper is

The pair of metals obtained by heating their oxides to higher temperatures

After partial roasting, the sulphide of copper is reduced by

Type metal is an alloy containing

The formulae of the soluble complexes formed during the extraction of Ag and Au by the cyanide process respectively are

One or Morethan One Options Correct Type

Direction (Q. Nos. 11-20) This section contains 10 multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONE or MORE THAN ONE are correct.

Q. ZnS and PbS present in a sulphide ore can be separated by using selectively suitable chemical. The incorrect statement in this is

Regarding leaching of bauxite ore which of the following is incorrect?

In the metal extraction which of the following is subjected to calcinations?

Which of the following process is based on the formation of complex compounds

Lapis lazuli is

ΔG° vs T plot in the Ellingham diagram slopes upwards for the reaction

Lithopone, a white pigment is a mixture of

Which is incorrect match?

Which of the following is a hydrated oxide mineral?

The Ellingham diagram of a certain metal M is represented in the figure

Q. 

The points A and B respectively corresponds to

Comprehension Type

Direction (Q, Nos. 21 and 22) This section contains a paragraph, each 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

Metal M is extracted from its ore, which is a double salt. It is a salt of M and potassium. The ore is concentrated and water of hydration present in the double salt is removed. The ore is then reduced to get the metal. The metal so produced used to make Grignard reagent.

Q. 

The ore of the metal in the passage

Passage

Metal M is extracted from its ore, which is a double salt. It is a salt of M and potassium. The ore is concentrated and water of hydration present in the double salt is removed. The ore is then reduced to get the metal. The metal so produced used to make Grignard reagent.

Q. 

The flame colouration given by the ore mentioned in the passage

Matching List Type

Direction (Q. No. 23 and 24) 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. 25 -29) This section contains 5 questions. When worked out will result in an integer from 0 to 9 (both inclusive).

Q. 

The value of ‘n‘ in the molecular formula Be_nAI₂Si₆O₁₈ is .........

In blue vitriol the number of water molecules directly bonded to Cu²⁺ ion are

The number of oxide ores among Rutile. Beryl, Tinstone, Pyrolusite, Chromite, Corundum, Chalcosite, Gypsum, Cryolite, Feldspar and Pitche blende

In German silver the percentage of silver is

How many of the following metals can be refined by vapour phase refining?
Zr, Zn, Cd, Hg, Ni, Co, Pt, Fe, Ti

Statement Type

Direction (Q. No. 30) This section is based on Statement I and Statement II. Select the correct answer from the codes given below.

Q. 

Statement I : F₂ is manufactured by electrolysis of KHF₂ but here anhydrous HF is used as solvent in place of water.
Statement II : In the presence of anhydrous HF, more F₂ is produced.