At constant T and P, which one of the following statements is correct for the reaction, CO(g)+12O2(g)CO2(g) [AIIMS 1982, 83; KCET 1988; BHU 1995; MP PET 1997, 99]

(1) ΔH is independent of the physical state of the reactants of that compound

(2) ΔH > ΔE

(3) ΔH < ΔE

(4) ΔH = ΔE

Concept Questions :-

Internal Energy and work done
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For the reaction of one mole of zinc dust with one mole of sulphuric acid in a bomb calorimeter, ΔU and w correspond to [AIIMS 2005]

(1) ΔU<0, w=0

(2) ΔU=0,w<0

(3) ΔU>0,w=0

(4) ΔU<0,w>0

Concept Questions :-

Internal Energy and work done
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If ΔH is the change in enthalpy and ΔE the change in internal energy accompanying a gaseous reaction [KCET 1989; CBSE PMT 1990]

(1) ΔH is always greater than ΔE

(2) ΔH < ΔE only if the number of moles of the products is greater than the number of the reactants

(3) ΔH is always less than ΔE

(4) ΔH < ΔE only if the number of moles of the products is less than the number of moles of the reactants

Concept Questions :-

First Law of Thermodynamics
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Enthalpy for the reaction C + O2 → CO2 is [DPMT 1987, 91]

(1) Positive

(2) Negative

(3) Zero

(4) None

Concept Questions :-

Enthalpy and It's Type
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The work done in ergs for the reversible expansion of one mole of an ideal gas from a volume of 10 litres to 20 litres at 25°C is 

(1) 2.303×298×0.082log2

(2) 298×107×8.31×2.303log2

(3) 2.303×298×0.082log0.5

(4) 8.31×107×2982.303log0.5

Concept Questions :-

First Law of Thermodynamics
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In a reversible isothermal process, the change in internal energy is

(1) Zero

(2) Positive

(3) Negative

(4) None of these

Concept Questions :-

Thermodynamics' Properties and process
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The enthalpy of neutralization of which of the following acids and bases is nearly –13.6 Kcal [Roorkee 1999]

(1) HCN and NaOH

(2) HCl and KOH

(3) HCl and HCN

(4) HCl and NH4OH

Concept Questions :-

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Work done during isothermal expansion of one mole of an ideal gas from 10 atm to 1 atm at 300 K is (Gas constant = 2) [AIIMS 2000]

(1) 938.8 cal.

(2) 1138.8 cal.

(3) 1381.8 cal.

(4) 1581.8 cal.

Concept Questions :-

First Law of Thermodynamics
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Joule-Thomson expansion is [JIPMER 2000]

(1) Isobaric

(2) Isoenthalpic

(3) Isothermal

(4) None of these

Concept Questions :-

Thermodynamics' Properties and process
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In an adiabatic expansion of an ideal gas [KCET (Med.) 2001; MH CET 2000]

(1) W = –ΔE

(2) W = ΔE

(3) ΔE = 0

(4) W = 0

Concept Questions :-

CP and CV and Relation for Real Gas
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