Which of the following compounds will absorb the maximum quantity of heat when dissolved in the same amount of water ? The heats of solution of these compounds at 25°C in kJ/mole of each solute is given in brackets [AMU (Engg.) 2000]
(1)
(2)
(3)
(4)
A system is changed from state A to state B by one path and from B to A by another path. If E1 and E2 are the corresponding changes in internal energy, then [Pb. PMT 2001]
1.
2.
3.
4. None of the above
If (i) , (ii) , (iii) , the heats of reaction are Q, –12, –10 respectively. Then Q = [Orissa JEE 2004]
(1) – 2
(2) 2
(3) – 22
(4) – 16
Adsorption of gases on a solid surface is generally exothermic because [IIT JEE (Screening) 2004]
1. Enthalpy is positive
2. Entropy decreases
3. Entropy increases
4. Free energy increase
Two mole of an ideal gas is expanded isothermally and reversibly from 1 litre ot 10 litre at 300 K. The enthalpy change (in kJ) for the process is [IIT JEE (Screening) 2004]
1. 11.4 kJ
2. –11.4 kJ
3. 0 kJ
4. 4.8 kJ
When a gas undergoes adiabatic expansion, it gets cooled due to -
1. Loss of energy
2. Fall in pressure
3. Decrease in velocity
4. Increase in energy with work done
In an isobaric process, the ratio of heat supplied to the system (dQ) and work done by the system (dW) for diatomic gas is [AFMC 2002]
(1) 1 : 1
(2) 7 : 2
(3) 7 : 5
(4) 5 : 7
If for a given substance melting point is TB and freezing point is TA, then correct variation shown by graph between entropy change and temperature is [DCE 2001]
(1)
(2)
(3)
(4)
The amount of heat measured for a reaction in a bomb calorimeter is
1. ΔG
2. ΔH
3. ΔE
4. PΔV
A Beckmann thermometer is used to measure -
1. High temperature
2. Low temperature
3. Normal temperature
4. All temperatures