List of top Chemistry Questions on Thermodynamics asked in IPU CET

Which of the following best explains, why a hot air balloon rises?

On combustion of x-g of ethanol in a bomb calorimeter, y-joules of heat energy is produced. The heat of combustion of ethanol ($\Delta H_{{comb}}$) is

When the solids Ba(OH)2 and NH4SCN are mixed, a solution is produced and the temperature drops. \[ {Ba(OH)}_2(s) + 2{NH}_4{SCN}(s) \rightarrow {Ba(SCN)}_2(aq) + 2{NH}_3(g) + 2{H}_2{O}(l) \] Which statement about the energetics of this reaction is correct?

Which of the following are true statements?
I. The heat capacity of a substance is the amount of heat that substance can hold per unit of temperature.
II. The specific heat for a single substance is the same for all phases of that substance.
III. When heat is added to a fluid, its temperature will change less if it is allowed to expand.

A work is done on the system such that one mole of an ideal gas at 400K is compressed isothermally and reversibly to 1/10th of its original volume. The amount of (use R=2 cal) work done will be

A metal rod is in thermal contact with the two heat reservoirs both at constant temperature, one at 100K and the other at 200K. The rod conducts 1000 J of heat from the warmer to the colder reservoir. If no energy is exchanged with the surroundings, what is the total change of entropy?

A man straightens up his room. His action does not violate the second law of thermodynamics because

NaCl dissolves spontaneously in water. Based upon the following reaction, NaCl(s) $\rightarrow$ Na$^{+}$(g) + Cl$^{-}$(g)

The values of all of the following are reversed when a reaction is reversed except

Describe the phase change for H$_2$O as pressure is raised at 100°C.

What is the total heat needed to change 1g of water from -10°C to 110°C at 1 atm? \[ \Delta H_{fusion} = 80 \, \text{cal/g}, \Delta H_{vaporisation} = 540 \, \text{cal/g}, \text{specific heat of ice and steam are 0.5 cal/g°C} \]

Which of the following statements is most likely true concerning the given reaction?
2A(g) + B(g) → 2C(g) + D(s)