GATE CY topic:equilibrium PYQs & Answers — Page 4

Questions 31–40 of 68. Imported answers require independent review unless marked reviewed.

The change in entropy of the surroundings (in J K

, rounded off to two decimal places) to convert 1 mol of supercooled water at 263 K to ice at 263 K at 1 bar is [Consider:

at 273 K = 6.0 kJ mol

, and the molar heat capacity of water is higher than that of ice by 37.0 J K

mol

in the temperature range of 263 K to 273 K]

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The equilibrium constant for the reaction

3 NO (g) ⇌ N₂O (g) + NO₂ (g)

at 25 °C is closest to:

[ΔG° = −104.18 kJ; R = 8.314 J mol⁻¹ K⁻¹]

Your answerChoose one option.

1.043

1.8 × 10¹⁸

1.651

5.7 × 10⁻¹⁹

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The phase diagram of CO₂ is shown below:

The correct statement(s) about CO₂ is/are:

Your answerSelect all correct options. You can choose more than one.

Below T_c, it does not exist in liquid state.

Above T_c, it does not exist in liquid state.

At T_c, it can exist in all three phases.

Above T₁, it does not exist in solid state.

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A reversible heat engine absorbs 20 kJ of heat from a source at 500 K and dissipates it to the reservoir at 400 K. The efficiency of the heat engine is ______ %.

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The change in enthalpy (ΔH) for the reaction

2 P (s) + 3 Br₂ (l) → 2 PBr₃ (l)

is −243 kJ. In this reaction, if the amount of phosphorus consumed is 3.1 g, the change in enthalpy (rounded off to two decimal places) is ______ kJ.

[Atomic Wt. of P = 31]

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A 5 V battery delivers a steady current of 1.5 A for a period of 2 h. The total charge that has passed through the circuit is ______ Coulombs.

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In an electrochemical cell, Ag⁺ ions in AgNO₃ are reduced to Ag metal at the cathode and Cu is oxidized to Cu²⁺ at the anode. A current of 0.7 A is passed through the cell for 10 min. The mass (in grams) of silver deposited and copper dissolved, respectively, are: [Faraday Constant = 96,485 C mol⁻¹, Atomic Weight of Ag = 107.9, Atomic Weight of Cu = 63.55]

Your answerChoose one option.

0.469 and 0.138

0.235 and 0.138

0.469 and 0.069

0.235 and 0.069

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Hexane and heptane are completely miscible. At 25 °C, the vapor pressures of hexane and heptane are 0.198 atm and 0.06 atm, respectively. The mole fractions of hexane and heptane in the vapor phase for a solution containing 4 M hexane and 6 M heptane, respectively, are:

Your answerChoose one option.

0.688 and 0.312

0.400 and 0.600

0.312 and 0.688

0.600 and 0.400

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The vapor pressure of toluene (Mol. Wt. = 92) is 0.13 atm at 25 °C. If 6 g of a hydrocarbon is dissolved in 92 g of toluene, the vapor pressure drops to 0.12 atm. The molar mass of the hydrocarbon (rounded off to the nearest integer) is ________.

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The reaction

CO (g) + Cl₂ (g) ⇌ COCl₂ (g)

at 500 °C, with initial pressures of 0.7 bar of CO and 1.0 bar of Cl₂, is allowed to reach equilibrium. The partial pressure of COCl₂ (g) at equilibrium is 0.15 bar. The equilibrium constant for this reaction at 500 °C (rounded off to two decimal places) is ______________.

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GATE CY topic:equilibrium PYQs

Question 65

Question 11

Question 15

Question 19

Question 22

Question 24

Question 34

Question 40

Question 51

Question 52