# In a bomb calorimeter, the heat of reaction is measured at

1.  Constant volume

2.  Constant pressure

3.  Constant volume and constant pressure

4.  None of these

4

Constant volume

Explanation :
No Explanation available for this question

# Assuming the water vapour is an ideal gas, the internal energy change (ΔU) when 1 mole of water is vapourised at 1ar pressure and 1000C(Given molar enthalpy of vapourisation of water at 1bar and 373K=41kJ mol-1and R=8.3J mol-1K) will be

1.  3.7904 kJ mol-1

2.  37.904 kJ mol-1

3.  41.00 kJ mol-1

4.  4.100 kJ mol-1

4

37.904 kJ mol-1

Explanation :
No Explanation available for this question

# The enthalpies of solution of anhydrous CuSO4 and CuSO4.5H2Oare -15.89 and 2.80k cal mol-1 respectively. The enthalpy of hydration of CuSO4to CuSO4. 5H2O is:

1.  -18.69 kcal

2.  13.09 kcal

3.  -13.09 kcal

4.  18.69 kcal

4

-18.69 kcal

Explanation :
No Explanation available for this question

# For the reaction : C(s)+O2(g)→CO2(g)

1.  ΔH

2.  ΔH>ΔU

3.  ΔH=ΔU

4.  ΔH=0

4

ΔH=ΔU

Explanation :
No Explanation available for this question

# The enthalpy of neutralisation of any strong acid and strong base is nearly equal to

1.  +57.3kJ mol-1

2.  -75.3 kJ mol-1

3.  +75.3 kJ mol-1

4.   -57.3kJ mol-

4

-57.3kJ mol-

Explanation :
No Explanation available for this question

# In conversion of limestone to lime, CaCO3(s)→CaO(s)+CO2(g)The values of ΔH0 and ΔS0 are +179.1kJ mol-1 and 160.2J/k respectively at 298K and 1bar. Assuming that ΔH0 and ΔS0 do not change with temperature, the temperature above which conversion of limestone to limestone to lime will be spontaneous is

1.  1200 K

2.  845k

3.  118k

4.  1008k

4

118k

Explanation :
No Explanation available for this question

# In an endothermic reaction, the ΔH value is

1.  Positive

2.  Negative

3.  Negative or positive

4.  Zero

4

Positive

Explanation :
No Explanation available for this question

# The entropy of the universe

1.  Tends towards a maximum

2.  Tends towards a minimum

3.  Tends to be zero

4.  Remains constant

4

Tends towards a maximum

Explanation :
No Explanation available for this question

# In an exothermic reaction, the reactants

1.  Have more energy than the products

2.  Are a higher temperature than the products

3.  Have less energy than the products

4.  Have the same energy as the products

4

Have more energy than the products

Explanation :
No Explanation available for this question

1.  -94 kcal

2.  -231.6 kcal

3.  +21.4 kcal

4.  +64.8 kcal

4