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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]
More +ve is ΔHs more is heat of solution.
A system is changed from state A to state B by one path and from B to A another path. If E1 and E2 are the corresponding changes in internal energy, then [Pb. PMT 2001]
ΔE = 0 for a cyclic process.
If (i) , (ii) , (iii) , the heats of reaction are Q, –12, –10 respectively. Then Q = [Orissa JEE 2004]
; ΔH = q
; ΔH = –12 …..(i)
; ΔH = –10 …..(ii)
adding equation (i) and (ii) we can get
ΔH = –12 + (–10) = –22
Adsorption of gases on solid surface is generally exothermic because [IIT JEE (Screening) 2004]
Due to randomness of particles is reduced since entropy decreases.
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]
ΔH = nCp ΔT
The process is isothermal therefore
ΔG = 0; ∴ ΔH = 0
When a gas undergoes adiabatic expansion, it gets cooled due to
Due to fall in temperature.
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]
; ; –dW = dQ – dE
{for diatomic of gas }
A Beckmann thermometer is used to measure
Backmann thermometer is used to measure low temperature.
The Beckmann differential thermometer is used for measuring small differences in temperature, having readability of around 0.001°C. This makes it useful for the determination of melting points, boiling points and calorimetry. Today it is superseded by sensitive digital thermometers using thermocouples, thermistors.
The heat liberated when 1.89 g of benzoic acid is burnt in a bomb calorimeter at 25°C increases the temperature of 18.94 kg of water by 0.632°C. If the specific heat of water at 25°C is 0.998 cal/g-deg, the value of the heat combustion of benzoic acid is [CPMT 1999; BHU 2000]
=
In thermodynamics, a process is called reversible when [AIIMS 2001]
Thermodynamics is a reversible process in which surroundings are always equilibrium with system.
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