Chemistry · Physics

Thermodynamics and Chemical Kinetics

1,092 Questions

Thermodynamics and chemical kinetics are crucial branches of physical chemistry. This area focuses on energy transformations, reaction rates, equilibrium constants, and catalysts. These topics carry significant weight in competitive science and engineering examinations.

Enthalpy and energyChemical equilibriumEntropy conceptsReaction kinetics and catalysts

Thermodynamics and Chemical Kinetics Questions

Multiple choice chemistry chemical thermodynamics system and surroundings introduction to thermodynamics basics of thermodynamics
Which of the following is not a state function?

  1. Temperature

  2. Density

  3. Work

  4. Volume

  5. Pressure
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Temperature, density, volume and pressure are state functions.
They are intrinsic properties of the system. Their values  depend on initial and final state only and are independent of path followed.
On the other hand, work is a path function. It is not an state function. Its value depends on the path followed.

Multiple choice biology life processes in living organisms- part 1 fermentation cell respiration living organisms and energy production

RQ in anaerobic respiration is?

  1. $0.7$
  2. $0.9$

  3. Unity

  4. Infinity
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

During aerobic respiration, oxygen is consumed and carbon dioxide is released. The ratio of the volume of carbon dioxide given out to the volume of oxygen absorbed in respiration, i.e., CO$ _2$/O$ _2$ is called respiratory quotient (RQ) or respiratory ratio.  in anaerobic respiration, CO2 is evolved but O2 is not consumed, and therefore RQ is infinite (∞).

Equation is as follows:                                               
                            C$ _6$H$ _12$O$ _6$ $\rightarrow$ 2C$ _2$H$ _5$OH + 2CO$ _2$ + energy
RQ CO$ _2$/O$ _2$ = 2/0 = infinity

So the correct option is 'infinity'.

Multiple choice chemistry energy production nuclear reactor the nuclear power station isotopes and nuclear chemistry

In a critical chain reaction, energy is released at

  1. increasing rate

  2. steady rate

  3. decreasing rate

  4. none
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In a critical chain reaction $K=1$,
where $K$ is the reproduction factor defined as the ratio of number of neutrons in any particular generation to the number of neutrons in the preceding generation.
As $K$ is $1$, energy is released in steady state.

Multiple choice principal and molar specific heats of gases isothermal and adiabatic processes specific heat capacity heat and thermodynamics physics

In an isobaric process, the correct ratio is :

  1. $\Delta Q:\Delta W=1:1$
  2. $\Delta Q:\Delta W=\gamma :\gamma -1$
  3. $\Delta Q:\Delta W= \gamma -1:\gamma $
  4. $\Delta Q:\Delta W= \gamma :1 $
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In an isobaric process, pressure is constant.
Heat added in an isobaric process is given by
$\Delta Q=\Delta U+ \Delta W$
$nC _p\Delta T=nC _v\Delta T+nR\Delta T$
$\displaystyle \therefore \dfrac {\Delta Q}{\Delta W}=\dfrac {nC _p\Delta T}{nR\Delta T}=\dfrac {C _p}{R}=\dfrac {\gamma R/\gamma -1}{R}=\dfrac {\gamma }{\gamma -1}$
Option B.

Multiple choice principal and molar specific heats of gases isothermal and adiabatic processes specific heat capacity heat and thermodynamics physics

Which of the following statements are incorrect?
I. If $Q > 0$, heat is added to the system.
II. If $W > 0$, work is done by the system.
III. If $W = 0$, work is done by the system.

  1. II and III

  2. I, II and III

  3. I and II

  4. I and III
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

I is correct (heat added). II is correct (work done by system). III is incorrect because if W=0, no work is done by the system; the system is at constant volume.

Multiple choice chemistry matter around us measurement of properties effect of temperature and pressure on states of matter general introduction: importance and scope of chemistry

Temperature is a measure of :

  1. the average kinetic energy of the particles in a substance.

  2. the average potential energy of the particles in a substance.

  3. the highest amount of kinetic energy the particles in a substance have.

  4. the number of particles a substance has.

  5. the amount of heat a substance has.

Reveal answer Fill a bubble to check yourself
A,E Correct answer
Explanation

Temperature is a measure of the average kinetic energy of the particles in a substance. 


As the average kinetic energy of the particles in a gas is proportional to the temperature of the gas.

Hence the correct options are A and E.