1)

An adiabatic process occurs in

JEE Physics

A)

open system

B)

closed system

C)

isolated system

 

D)

 in all the given system

2)

Three moles of an ideal gas expanded spontaneously into vacuum. The work done will be :

JEE Physics

A)

Zero

B)

Infinite

C)

3 Joules

 

D)

9 Joules

3)

Hess's law is based on

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A)

law of conservation of mass

B)

law of conservation of energy

C)

first law of thermodynamics

 

D)

None of the above

4)

In order to decompose 9 g water 142.5 kJ heat is required. Hence, the enthalpy of formation of water is

JEE Physics

A)

-142.5 kJ

B)

+ 142.5 kJ

C)

- 285 kJ

 

D)

+ 285 kJ

5)

If one mole of ammonia and one mole of hydrogen chloride are mixed in a closed container to form ammonium chloride gas, then

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A)

∆H > ∆U

B)

∆H = ∆U

C)

∆H < ∆U

 

D)

there is no relationship

6)

The bond energy is the energy required to

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A)

dissociate one mole of the substance

B)

dissociate bond in 1 kg of the substance

C)

break one mole of similar bonds

 

D)

break bonds in one mole of substance

7)

Heat of combustion of carbon monoxide at constant volume and at 17° C is - 67710 cal. The heat of combustion at constant pressure is

JEE Physics

A)

 - 68000 cal

B)

 - 67800 cal

C)

 - 67050 cal

 

D)

 + 68500 cal

8)

Which is correct for an endothermic reaction ?

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A)

∆H is negative

B)

∆H is positive

C)

∆E is negative

 

D)

∆H = 0

9)

For the gaseous reaction involving the complete combustion of iso-butane

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A)

∆H = ∆E

B)

∆H > ∆E

C)

∆H < ∆E

 

D)

None of these

10)

Heat liberated with 100 mL of 1 N NaOH is neutralised by 300 mL of 1 N HCl

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A)

11.56 kJ

B)

22.92 kJ

 

C)

5.73 kJ

D)

17.19 kJ