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Chemistry is important because everything you do is chemistry! Even your body is made of chemicals. Chemical reactions occur when you breathe, eat, or just sit there reading. All matter is made of chemicals, so the importance of chemistry is that it's the study of everything..

Chemistry is important because everything you do is chemistry! Even your body is made of chemicals. Chemical reactions occur when you breathe, eat, or just sit there reading. All matter is made of chemicals, so the importance of chemistry is that it's the study of everything..

**Q1.In which of the following process ∆H and ∆U are of same magnitude**:

Solution

∆H = ∆U + ∆nRT

∆n = 0 = n

∴ ∆H = ∆U

∆H = ∆U + ∆nRT

∆n = 0 = n

_{P}- n_{R}∴ ∆H = ∆U

**Q2.**1 g H

_{2}gas STP is expanded so that the volume is doubled. Hence, work done is

Solution

V1 (volume of 1 g H

V2 (volume of 1 g H

∴ W = P∆V = 11.2 L atm

V1 (volume of 1 g H

_{2}) = 11.2 L at STPV2 (volume of 1 g H

_{2}) = 22.4 L∴ W = P∆V = 11.2 L atm

**Q3.**For the equations

C(diamond) + 2H

_{2}(g) → CH

_{4}(g) ∆H1

C(g) + 4H(g) → CH

_{4}(g) ∆H2

Predict whether

Solution

∆H1 > ∆H2

∆H1 > ∆H2

**Q4.**For the reaction

X

_{2}O

_{4}(l) → 2XO

_{2}(g)

∆U = 2.1 kcal, ∆S = 20 cal K

^{-1}at 300 K

Hence, ∆G is

Solution

∆H = ∆U + ∆n

= 2.1×2×0.002×300 = 3.3 kcal

∆G = ∆H - T∆S

= 3.3×-300×0.02 = -2.7 kcal

∆H = ∆U + ∆n

_{g}RT= 2.1×2×0.002×300 = 3.3 kcal

∆G = ∆H - T∆S

= 3.3×-300×0.02 = -2.7 kcal

**Q6.**For an ideal gas Joule-Thomson coefficient is

Solution

In an ideal gas, there is no force of attraction between molecules.

Hence, no heat is lost in the expansion

In an ideal gas, there is no force of attraction between molecules.

Hence, no heat is lost in the expansion

**Q7.**Which of the following type of energies are involved in Born Haber’s cycle?

Solution

(a,b,c,d)

Born-Haber cycle

(a,b,c,d)

Born-Haber cycle

**Q8.**The correct expressions for an adiabatic process are

Solution

(a,c)

(a,c)

**Q9.**The heat of combustion of enthanol was determined in a bomb calorimeter and was found to be -670.48 kcal mol

^{-1}at 25°C. What will be ∆U for the same reaction at 298K?

Solution

- 335.24 kcal

- 335.24 kcal

**Q10.**In which of the following cases entropy increases?

Solution

(a,b,c)

(a,b,c)