GATE CY year:2019 PYQs & Answers — Page 2

Questions 11–20 of 65. Imported answers require independent review unless marked reviewed.

Topic practice 65 questionsPage 2 of 7

The INCORRECT statement about the solid-state structure of CsCl and CaF₂ is:

Your answerChoose one option.

Cations in both solids exhibit coordination number 8.

CsCl has bc type structure and CaF₂ has cubic close pack structure.

Radius ratio for Cs/Cl and Ca/F is 0.93 and 0.73, respectively.

Both exhibit close pack structure.

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The INCORRECT statement about the interhalogen compound ICl₃ is:

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It exists as a dimer.

Geometry around the iodine is tetrahedral in solid-state.

It decomposes as ICl and Cl₂ in gas-phase.

Liquid ICl₃ conducts electricity.

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Among the following carbon allotropes, the one with discrete molecular structure is

Your answerChoose one option.

Diamond

α-Graphite

β-Graphite

Fullerene

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The INCORRECT statement about the silicones is:

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They are thermally unstable because of the Si–C bond.

They are insoluble in water.

They are organosilicon polymers.

They have stable silica-like skeleton (–Si–O–Si–O–Si–).

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The Δₒ value of [Ni(H₂O)₆]²⁺ is 850 cm⁻¹. The Δₒ values for [NiCl₆]⁴⁻ and [Ni(NH₃)₆]²⁺ compared to [Ni(H₂O)₆]²⁺ are

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higher and lower, respectively.

lower and higher, respectively.

higher in both complex ions.

lower in both complex ions.

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In Freundlich isotherm, a linear relationship is obtained in the plot of (

= surface coverage and

= partial pressure of the gas)

Your answerChoose one option.

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Micelle formation is accompanied by the

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decrease in overall entropy due to ordering.

increase in overall entropy mostly due to increase in solvent entropy.

increase in overall entropy mostly due to increase in solute entropy.

increase in overall entropy and decrease in enthalpy.

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Consider the following phase diagram of CO₂ (not to scale). At equilibrium, the INCORRECT statement is:

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At 200 K, on increasing the pressure from 1 to 50 atm, CO₂ gas condenses to liquid.

It is not possible to obtain liquid CO₂ from gaseous CO₂ below 5.11 atm.

Both liquid and gas phase of CO₂ coexist at 298.15 K and 67 atm.

With increasing pressure, the melting point of solid CO₂ increases.

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The major product formed in the following reaction is

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Diagram for Chemistry question 9 (figure 2)

Diagram for Chemistry question 9 (figure 3)

Diagram for Chemistry question 9 (figure 4)

Diagram for Chemistry question 9 (figure 5)

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The Woodward-Hoffmann condition to bring out the following transformation is

Diagram for Chemistry question 10 (figure 2)

Your answerChoose one option.

, conrotatory

, disrotatory

hν, disrotatory

hν, conrotatory

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GATE CY year:2019 PYQs

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Question 9

Question 10