Thermodynamics - Class 12 MCQ

A positive change in enthalpy occurs in:

The temperature of a 5 mL of strong acid increases by 5⁰C when 5 mL of a strong base is added to it, If 10 mL of each are mixed, temperature should increase by:    

The value of ΔH⁰ for the reaction Cu⁺(g) + l^-(g) → Cul(g) is -446 kJ mol^-1. If the ionisation energy of Cu(g) is 745 kJ mol^-1 and the electron affinity of I(g) is -295 kJ mol^-1, then the value of ΔH⁰ for the formation of one mole of CuI(g) from Cu(g) and l(g) is:    

The heat of combustion for C,H₂ and CH₄ are -349.0,-241.8 and -906.7 kJ respectively. The heat of formation of CH₄ is:    

Equal volume of  M HCI and 1 M H₂SO₄ are neutralised by dilute NaOH solution and x and y kcal of heat are liberated respectively. Which of the following is true?                    

When a certain amount of ethyene was burnt, 6226 kJ was evolved. If heat of combustion of ethylene is 1411 kJ, the volume of O₂ (at NTP) that entered into the reaction is:    

For the reaction,

which of the following statements is correct?

Heat of combusion ΔH for C(s),H₂(g) and CH₄(g) are -94, -68 and -213 kcal/mole,than

  is:    

Assume each reaction is carried out in an open container. For which reaction will ΔH = ΔU?

ΔH_f of graphite is 0.23 kJ/mol and ΔH_f of diamond is 1.896 kJ/mol. ΔH_Trsnsition from graphite to diamond is:    

For the reaction
X₂O₄(l) → 2XO₂(g)
ΔU = 2.1 kcal, ΔS = 20 cal K^-1 at 300K
Hence,ΔG is:

The temperature coefficient of e.m.f of a cell can be given by:
 

ΔS⁰ will be highest for the reaction:

Change in entropy is negative for:

For the precipitation of AgCI by Ag⁺ ions and HCI

Which is an extensive property of the system ?    

A container has hydrogen and oxygen mixture in ratio of 4:1 by mass, then on mixing:    

Which of the following is correct option for free expansion of an ideal gas ?

Enthalpy of vaporisation for water is 186.5 kJ mol^-1. The entropy change during vaporisation is ...kJ K^-1mol^-1    

The work done by a system is 8 J, when 40 J heat is supplied to it. The change in internal energy of the system during the process is:    

The maximum work done in expanding 16 g oxygen at 300 K and occupying a volume of 5 dm3 isothermally until the volume become 25dm3 is:    

The entropy change for the reaction given below,
2H₂(g) + O₂ (g) → 2H₂O(l)
is....at 300 K. Standard entropies of H₂(g),O₂(g) and H₂O(l) are 126.6, 201.20 and 68.0 JK^-1 mol^-1 respectively.

One mole of ice is converted into water at 273 K. The entropies of H₂O(s) and H₂O(l) are 38.20 and 60.01 J mol^-1 K^-1 respectively. The enthalpy change for the conversion is:    

Boiling point of a liquid is 50 K at 1 atm and ΔH _vap= 460.6 cal mol^-1 . What will be its b.p. at 10 atm?    

The ratio of slopes of log P vs log V for reversible adiabatic process and reversible isothermal process of an ideal gas is equal to :

Internal energy and pressure of a gas of unit volume are related as:

The molar heat capacity of water at constant pressure P, is 75 JK^-1mol^-1. When 1.0 kJ of heat is supplied to 100 g of water which is free to expand,the increase in temperature of water is :