Home Courses Tests Questions
Hindi Version of the Questions with Green background are available only
objective Ques (158 results)
21)

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

22)

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

JEE Physics
A)

∆H > ∆U

B)

∆H = ∆U

C)

∆H < ∆U

 

D)

there is no relationship

23)

The bond energy is the energy required to

JEE Physics
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

24)

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

25)

Which is correct for an endothermic reaction ?

JEE Physics
A)

∆H is negative

B)

∆H is positive

C)

∆E is negative

 

D)

∆H = 0

26)

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

JEE Physics
A)

∆H = ∆E

B)

∆H > ∆E

C)

∆H < ∆E

 

D)

None of these

27)

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

JEE Physics
A)

11.56 kJ

B)

22.92 kJ

 

C)

5.73 kJ

D)

17.19 kJ

28)

Heat required to raise the temperature of 1 mole of a substance by 1° is called

 

JEE Physics
A)

molar heat capacity

B)

specific heat

C)

water equivalent

 

D)

specific gravity

29)

If ∆G for a reaction is negative, you infer that the change is

JEE Physics
A)

spontaneous

B)

non-spontaneous

C)

reversible

D)

irrevrsible

 

E)

equilibrium

30)

What will be the value of ∆G for ice at 8°C temperature ?

JEE Physics
A)

One

 

 

 

B)

Zero

C)

Negative

D)

Positive

showing 21 - 30 results of 158 results
onlinetest practiceQue