NEET 2017 | Thermodynamics Question 23 | Chemistry

A gas is allowed to expand in a well insulated container against a constant external pressure of 2.5 atm from an initial volume of 2.50 L to a final volume of 4.50 L. The change in internal energy $$\Delta $$U of the gas in joules will be

$$-$$ 500 J

$$-$$ 505 J

+ 505 J

1136.25 J

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

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