NEET 2017 | Thermodynamics Question 22 | Chemistry

NEET 2017

MCQ (Single Correct Answer)

-1

For a given reaction, $$\Delta $$H = 35.5 kJ mol^$$-$$1 and $$\Delta $$S = 83.6 J K^$$-$$1 mol^$$-$$1. The reaction is spontaneous at (Assume that $$\Delta $$H and $$\Delta $$S do not vary with temperature.)

T > 425 K

all temperatures

T > 298 K

T < 425 K

NEET 2016 Phase 2

MCQ (Single Correct Answer)

-1

For a sample of perfect gas when its pressure is changed isothermally from p_i to p_f, the entropy change is given by

$$\Delta S = nR\,\ln \left( {{{{p_f}} \over {{p_i}}}} \right)$$

$$\Delta S = nR\,\ln \left( {{{{p_i}} \over {{p_f}}}} \right)$$

$$\Delta S = nRT\,\ln \left( {{{{p_f}} \over {{p_i}}}} \right)$$

$$\Delta S = RT\,\ln \left( {{{{p_i}} \over {{p_f}}}} \right)$$

AIPMT 2015

MCQ (Single Correct Answer)

-1

The heat of combination of carbon to CO₂ is $$-$$393.5 kJ/mol. The heat released upon formation of 35.2 g of CO₂ from carbon and oxygen gas is

+ 315 kJ

$$-$$630 kJ

$$-$$ 3.15 kJ

$$-$$ 315 kJ

AIPMT 2014

MCQ (Single Correct Answer)

-1

Which of the following statements is correct for the spontaneous adsorption of a gas?

$$\Delta $$S is negative and, therefore $$\Delta $$H should be highly positive.

$$\Delta $$S is negative and therefore, $$\Delta $$H should be highly negative.

$$\Delta $$S is positive and therefore, $$\Delta $$H should be negative .

$$\Delta $$S is positive and therefore, $$\Delta $$H should also be highly positive.

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Biology

Botany

Zoology

Human Health and Diseases Body Fluids and Its Circulation Locomotion and Movement Neural Control and Coordination Reproduction in Organisms Reproductive Health Structural Organisation in Animals Digestion and Absorption Excretory Products and Their Elimination Chemical Coordination and Integration Human Reproduction Animal Kingdom Breathing and Exchange of Gases Evolution