The heat of formation of HCl(g) from the reaction

H2(g) + Cl2(g) ; H = -44 kcal is

1. +44 kcal

2. -44 kcal

3. +22 kcal

4. -22 kcal

Concept Questions :-

Thermochemistry
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If a chemical change is brought about by one or more methods in one or more steps, then the amount of heat absorbed or evolved during the complete course of reaction is same, which ever method was followed. This law is known as-

1. Le Chatelier's principle

2. Hess's law

3. Joule Thomson effect

4. Trouton's law

Concept Questions :-

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If 1.00 kcal of heat is added to 1.2 L of oxygen in a cylinder at constant pressure of 1.000 atm, the volume increases to 1.5 L, Hence E for this process is:

1. 0.993 kcal

2. 1.0073 kcal

3. 0.0993 kcal

4. 1.00073 kcal

Concept Questions :-

Enthalpy and It's Type
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Heats of combustion of CH4, C2H4, C2H6 are -890, -1411 and -1560 kJ/mole respectively. Which has the lowest fuel value in kJ/gm ?

1. CH4

2. C2H4

3. C2H6

4. All same

Concept Questions :-

Thermochemistry
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The standard heat of combustion of a hydrocarbon compound is an/a-

1. Extensive property

2. Colligative property

3. Intensive property

4. Constitutive property

Concept Questions :-

Extensive and Intensive Properties
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The Kirchhoff's equation gives the effect of....on heat of reaction.

1. Pressure

2. Temperature

3. Volume

4. Molecularity

Concept Questions :-

CP and CV and Relation for Real Gas
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The temperature of 5 ml of a strong acid increases by 5 when 5 ml of a strong base is added to it. If 10 ml of each is mixed, temperature should increase by-

1. 5

2. 10

3. 15

4. cannot be known

Concept Questions :-

Thermochemistry
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The heat of neutralisation of HCl by NaOH is -55.9 kJ/mole. If the heat of neutralisation of HCN by NaOH is -12.1 kJ/mole, then energy of dissociation of HCN is-

1. -43.8 kJ

2. 43.8 kJ

3. 68 kJ

4. -68 kJ

Concept Questions :-

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For a reaction at equilibrium-

1. G=G=0

2. G=0 but not G

3. G=0 but not G

4. G=G0

Concept Questions :-

Gibbs Energy Change
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Using only the following data:

(I) Fe2O3s+3COg2Fe(s)+3CO2(g);H=-26.8 kJ

(II) Fes+COgFeOs+COg;H=+16.5 kJ

the H value, in kilojoules, for the reaction

Fe2O3s+COg2FeOs+CO2g is calculated to be:

1. -43.3

2. -10.3

3. +6.2

4. +10.3

Concept Questions :-

Enthalpy and It's Type
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