TS EAMCET · Chemistry · General Principles and Processes of Isolation of Metals

The metal which is refined by Mond process is (X), by van Arkel process is (Y) and by zone refining is (Z). X, Y and $\mathrm{Z}$ respectively are

A $\mathrm{Ni}, \mathrm{Zr}, \mathrm{Ga}$
B $\mathrm{Zr}, \mathrm{Ni}, \mathrm{Ga}$
C $\mathrm{Ga}, \mathrm{Ni}, \mathrm{Zr}$
D $\mathrm{Ni}, \mathrm{Ga}, \mathrm{Zr}$

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Correct Answer

(A) $\mathrm{Ni}, \mathrm{Zr}, \mathrm{Ga}$

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Detailed explanation

Mond process is used for refining of nickel. Van Arkel method is used for refining zirconium or titanium. Zone refining method is used for producing semiconductor and other metals of very high purity eg., germanium, silicon, boron, gallium and indium.

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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3 moles of an ideal monoatomic gas performs $A B C D A$ cyclic process as shown in figure below. The gas temperatures are $T_A=400 \mathrm{~K}$, $T_B=800 \mathrm{~K}, T_C=2400 \mathrm{~K}$ and $T_D=1200 \mathrm{~K}$. The work done by the gas is (approximately) $(R=8.314 \mathrm{~J} / \mathrm{mol} \mathrm{K})$

TS EAMCET 2010 Hard

Following lists contain reactions and their corresponding equilibrium constants at different temperatures:

List - I (Reaction)	List - II $(K_{p})$
$2 {SO}_{2} (g) + O_{2} (g) ⇌ 2 {SO}_{3} (g) at 298 K$	$4.0 \times 10^{24}$
$2 {SO}_{2} (g) + O_{2} (g) ⇌ 2 {SO}_{3} (g) at 700 K$	$3.0 \times 10^{4}$
$N_{2} O_{4} (g) ⇌ 2 {NO}_{2} (g) at 298 K$	$0.98$
$N_{2} O_{4} (g) ⇌ 2 {NO}_{2} (g) at 500 K$	$1700$

∆ H_{1}^{0} and ∆ H_{2}^{0}

are the standard enthalpies for the reactions

2 {SO}_{2} + O_{2} ⇌ 2 {SO}_{3} and N_{2} O_{4} ⇌ 2 {NO}_{2}

respectively, then:

TS EAMCET 2019 Easy

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The metal which is refined by Mond process is (X), by van Arkel process is (Y) and by zone refining is (Z). X, Y and \(\mathrm{Z}\) respectively are

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