19 questions from 2021
Given below are two statements.Statement I: The choice of reducing agents for metals extraction can be made by using Ellingham diagram, a plot of \( \Delta G \) vs temperature.Statement II: The value of \( \Delta S \) increases from left to right in Ellingham diagram.In the light of the above statements, choose the most appropriate answer from the options given below:
Match List-I with List-II :
Choose the correct answer from the options given below :
Given below are two statements:Statement I : Sphalerite is a sulphide ore of zinc and copper glance is a sulphide ore of copper.Statement II : It is possible to separate two sulphide ores by adjusting proportion of oil to water or by using ‘depressants’ in a froth flotation method.Choose the most appropriate answer from the options given below:
In the leaching of alumina from bauxite, the ore expected to leach out in the process by reacting with \( \mathrm{NaOH} \) is:
Consider two chemical reactions \( (A) \) and \( (B) \) that take place during metallurgical process:\( (A)\displaystyle \text{ZnCO}_{3\text{ (s)}} \xrightarrow{\Delta} \text{ZnO}_{\text{ (s)}} + \text{CO}_{2\text{ (g)}}\)\( (B)\displaystyle 2\text{ZnS}_{\text{ (s)}} + 3\text{O}_{2\text{ (g)}} \xrightarrow{\Delta} 2\text{ZnO}_{\text{ (s)}} + 2\text{SO}_{2\text{ (g)}} \)The correct option of names given to them respectively is:
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).Assertion (A) : Aluminium is extracted from bauxite by the electrolysis of molten mixture of \( \mathrm{Al_2O_3} \) with cryolite.Reason (R) : The oxidation state of Al in cryolite is \( +3 \).In the light of the above statements, choose the most appropriate answer from the options given below:
Match List -I with List IIChoose the correct answer from the options given below:
The statement that is INCORRECT about Ellingham diagram is :
The metal that can be purified economically by fractional distillation method is:
The addition of silica during the extraction of copper from its sulphide ore:
Which refining process is generally used in the purification of low melting metals?
Match List-I with List-II.
Choose the most appropriate answer from the options given below:
Calamine and Malachite, respectively, are the ores of:
The parameters of the unit cell of a substance are \( a = 2.5 \), \( b = 3.0 \), \( c = 4.0 \), \( \alpha = 90^\circ \), \( \beta = 120^\circ \), \( \gamma = 90^\circ \). The crystal system of the substance is :
The point of intersection and sudden increase in the slope, in the diagram given below, respectively, indicates:
Match List I with List II : (Both having metallurgical terms)
Choose the correct answer from the options given below:
The chemical that is added to reduce the melting point of the reaction mixture during the extraction of aluminium is:
In the electrolytic refining of blister copper, the total number of main impurities, from the following removed as anode mud is ________ . Pb, Sb, Se, Te, Ru, Ag, Au and Pt
Which of the following reduction reaction CANNOT be carried out with coke?
