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For an Isochoric process - Chemistry

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प्रश्न

For an Isochoric process

विकल्प

  • ∆U = 0

  • ∆V = 0

  • ∆P = 0

  • Q = 0

MCQ

उत्तर

∆V = 0

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First Law of Thermodynamics
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अध्याय 4: Chemical Thermodynamics - Multiple choice questions

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एससीईआरटी महाराष्ट्र Chemistry [English] 12 Standard HSC
अध्याय 4 Chemical Thermodynamics
Multiple choice questions | Q 6

संबंधित प्रश्न

When we heat an object, it expands. Is work done by the object in this process? Is heat given to the object equal to the increase in its internal energy?


The first law of thermodynamics is a statement of ____________ .


A thermally insulated, closed copper vessel contains water at 15°C. When the vessel is shaken vigorously for 15 minutes, the temperature rises to 17°C. The mass of the vessel is 100 g and that of the water is 200 g. The specific heat capacities of copper and water are 420 J kg−1 K−1 and 4200 J kg−1 K−1 respectively. Neglect any thermal expansion. (a) How much heat is transferred to the liquid-vessel system? (b) How much work has been done on this system? (c) How much is the increase in internal energy of the system?


The pressure of a gas changes linearly with volume from 10 kPa, 200 cc to 50 kPa, 50 cc. (a) Calculate the work done by the gas. (b) If no heat is supplied or extracted from the gas, what is the change in the internal energy of the gas?


50 cal of heat should be supplied to take a system from the state A to the state B through the path ACB as shown in figure. Find the quantity of heat to be suppled to take it from A to B via ADB.


Calculate the heat absorbed by a system in going through the cyclic process shown in figure.


Figure shows the variation in the internal energy U with the volume V of 2.0 mol of an ideal gas in a cyclic process abcda. The temperatures of the gas at b and c are 500 K and 300 K respectively. Calculate the heat absorbed by the gas during the process.


A sample of gas absorbs 4000 kJ of heat and surrounding does 2000 J of work on sample. What is the value of ∆U?


Which of the following are TRUE for a reversible isothermal process?

(i) ∆U = 0

(ii) ∆H = 0

(iii) Q = W

(iv) ∆T = 0


The process, in which no heat enters or leaves the system, is termed as ____________.


An ideal gas undergoes four different processes from the same initial state (figure). Four processes are adiabatic, isothermal, isobaric and isochoric. Out of 1, 2, 3 and 4 which one is adiabatic.


An ideal gas undergoes cyclic process ABCDA as shown in given P-V diagram (figure). The amount of work done by the gas is ______.


Three copper blocks of masses M1, M2 and M3 kg respectively are brought into thermal contact till they reach equilibrium. Before contact, they were at T1, T2, T3 (T1 > T2 > T3). Assuming there is no heat loss to the surroundings, the equilibrium temprature T is (s is specific heat of copper)


An ideal gas undergoes isothermal process from some initial state i to final state f. Choose the correct alternatives.

  1. dU = 0
  2. dQ= 0
  3. dQ = dU
  4. dQ = dW

Can a system be heated and its temperature remains constant?


Air pressure in a car tyre increases during driving. Explain.


A cycle followed by an engine (made of one mole of perfect gas in a cylinder with a piston) is shown in figure.

A to B : volume constant
B to C : adiabatic
C to D : volume constant
D to A : adiabatic

VC = VD = 2VA = 2VB

  1. In which part of the cycle heat is supplied to the engine from outside?
  2. In which part of the cycle heat is being given to the surrounding by the engine?
  3. What is the work done by the engine in one cycle? Write your answer in term of PA, PB, VA.
  4. What is the efficiency of the engine?

(γ = `5/3` for the gas), (Cv = `3/2` R for one mole)


A cycle followed by an engine (made of one mole of an ideal gas in a cylinder with a piston) is shown in figure. Find heat exchanged by the engine, with the surroundings for each section of the cycle. (Cv = (3/2)R)

  1. AB : constant volume
  2. BC : constant pressure
  3. CD : adiabatic
  4. DA : constant pressure

Write the mathematical equation for the first law of thermodynamics for:

Isothermal process


An ideal gas is taken through series of changes ABCA. The amount of work involved in the cycle is ______.

 


200g water is heated from 40°C to 60°C. Ignoring the slight expansion of water, the change in its internal energy is close to ______.

(Given specific heat of water = 4184 J/kgK)


ΔU = 0 is true for ______.


The amount of work done in increasing the voltage across the plates of capacitor from 5 V to 10 V is W. The work done in increasing it from 10 V to 15 V will be ______.


104 J of work is done on a certain volume of a gas. If the gas releases 125 kJ of heat, calculate the change in internal energy of the gas.


Using the first law of thermodynamics, show that for an ideal gas, the difference between the molar specific heat capacities at constant pressure and at constant volume is equal to the molar gas constant R.


What is Isobaric process?


Show that the heat absorbed at constant pressure is equal to the change in enthalpy of the system.


Obtain an expression for the workdone by a gas in an isothermal process.


Write a short note on isobar.


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