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Physical Chemistry Questions

Practice 106 Physical Chemistry questions with detailed answers and explanations. Free MCQs, PYQs, and mock test questions for NEET, JEE, GATE, SSC and more.

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About Physical Chemistry — practice questions, PYQs & concepts

Physical Chemistry is a frequently-tested topic on Chemistry. ExamTest.live currently lists 106 Physical Chemistry questions spanning previous-year papers from 2026 to 2026, each with worked solutions and a step-by-step explanation. Use the filters on this page to focus on a specific exam, difficulty level or year — every answer key is free, no sign-up required.

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All Physical Chemistry Questions(1–100 of 106)

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Q1mediummcqChemistryAIEEE 20062026
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An ideal gas is allowed to expand both reversibly and irreversibly in an isolated system. If is the initial temperature and is the final temperature, which of the following statements is correct?
Q2mediummcqChemistryAIEEE 20062026
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Density of a solution of acetic acid in water is . The molality of the solution is:
Q3easymcqChemistryAIEEE 20062026
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In Langmuir’s model of adsorption of a gas on a solid surface:
Q4mediummcqChemistryAIEEE 20062026
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of glucose () is added to of water. The vapour pressure of water for this aqueous solution at is:
Q5easymcqChemistryAIEEE 20062026
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According to Bohr’s theory, the angular momentum of an electron in orbit is:
Q6easymcqChemistryAIEEE 20062026
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The standard enthalpy of formation () at for methane, , is . The additional information required to determine the average energy for bond formation would be:
Q7mediummcqChemistryAIEEE 20062026
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The ionic mobility of alkali metal ions in aqueous solution is maximum for:
Q8easymcqChemistryAIEEE 20062026
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() for the formation of carbon monoxide () from its elements at is ():
Q9mediummcqChemistryAIEEE 20062026
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The increasing order of the first ionization enthalpies of the elements B, P, S and F (lowest first) is:
Q10hardmcqChemistryAIEEE 20062026
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The standard enthalpy of formation for is calculated from: Standard states are and .
Q11easymcqChemistryAIEEE 20062026
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Rate of a reaction can be expressed by Arrhenius equation as . In this equation, represents:
Q12mediummcqChemistryAIEEE 20062026
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Uncertainty in the position of an electron () moving with a velocity , accurate up to , will be ():
Q13easymcqChemistryAIEEE 20062026
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Total volume of atoms present in a face-centre cubic (FCC) unit cell of a metal is ( is atomic radius):
Q14mediummcqChemistryAIEEE 20062026
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Phosphorus pentachloride dissociates as follows, in a closed reaction vessel, . If total pressure at equilibrium of the reaction mixture is and degree of dissociation of is , the partial pressure of will be:
Q15easymcqChemistryAIEEE 20062026
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A reaction was found to be second order with respect to the concentration of carbon monoxide. If the concentration of carbon monoxide is doubled, with everything else kept the same, the rate of reaction will:
Q16hardmcqChemistryAIEEE 20062026
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Given at : What is the value of for ? ()
Q17hardmcqChemistryAIEEE 20062026
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Resistance of a conductivity cell filled with a solution of an electrolyte is . The conductivity is . Resistance of the same cell when filled with of the same solution is . The molar conductivity of solution of the electrolyte will be:
Q18mediummcqChemistryAIEEE 20062026
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The equilibrium constant for the reaction is . The value of for the reaction will be:
Q19easymcqChemistryAIEEE 20062026
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Which one of the following sets of ions represents a collection of isoelectronic species?
Q20mediummcqChemistryAIEEE 20062026
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How many moles of magnesium phosphate, will contain of oxygen atoms?
Q21easymcqChemistryAIEEE 20062026
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Which of the following molecules/ions does not contain unpaired electrons?
Q22easymcqChemistryAIEEE 20062026
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Among the following mixtures, dipole-dipole as the major interaction, is present in:
Q23mediummcqChemistryAIEEE 20062026
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The following mechanism has been proposed for the reaction of with to form : If the second step is the rate determining step, the order of the reaction with respect to is:
Q24mediummcqChemistryAIEEE 20062026
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The molar conductivities and at infinite dilution in water at are and respectively. To calculate , the additional value required is:
Q25mediummcqChemistryNEET (UG) 20242026
Match the following reduction processes with the number of Faradays required:
image
Q26mediummcqChemistryAIEEE 20092026
The half life period of a first order chemical reaction is . The time required for the completion of of the chemical reaction will be ():
Q27mediummcqChemistryFIITJEE AIEEE 2011 (Set Q)2026
a' and b' are van der Waals' constants for gases. Chlorine is more easily liquefied than ethane because:
Q28mediummcqChemistryAIEEE 20092026
Which of the following statements is incorrect regarding physisorption?
Q29mediummcqChemistryAIEEE 20092026
Solid is gradually dissolved in a solution. At what concentration of will a precipitate begin to form? ( for ).
Q30mediummcqChemistryAIEEE 20092026
Two liquids and form an ideal solution. At , vapour pressure of the solution containing of and of is . At the same temperature, if of is further added to this solution, vapour pressure of the solution increases by . Vapour pressure (in ) of and in their pure states will be, respectively:
Q31mediummcqChemistryAIEEE 20092026
In a fuel cell methanol is used as fuel and oxygen gas is used as an oxidizer. The reaction is . At standard Gibb’s energies of formation for , and are , and respectively. If standard enthalpy of combustion of methanol is , efficiency of the fuel cell will be:
Q32mediummcqChemistryAIEEE 20092026
On the basis of the following thermochemical data: (); ; The value of enthalpy of formation of ion at is:
Q33mediummcqChemistryNEET (UG) 20242026
of sodium hydroxide was treated with of solution. The mass of sodium hydroxide left unreacted is equal to:
Q34mediummcqChemistryAIEEE 20092026
Copper crystallizes in fcc with a unit cell length of . What is the radius of copper atom?
Q35mediummcqChemistryAIEEE 20092026
Given: , . The value of standard electrode potential for the change, will be:
Q36mediummcqChemistryNEET (UG) 20242026
The highest number of helium atoms is in:
Q37hardmcqChemistryFIITJEE AIEEE 2011 (Set Q)2026
The reduction potential of hydrogen half cell will be negative if:
Q38mediummcqChemistryAIEEE 20092026
A binary liquid solution is prepared by mixing n-heptane and ethanol. Which one of the following statements is correct regarding the behaviour of the solution?
Q39mediummcqChemistryNEET (UG) 20242026
The Henry’s law constant () values of three gases (A, B, C) in water are , , and , respectively. The solubility of these gases in water follows the order:
Q40mediummcqChemistryFIITJEE AIEEE 2011 (Set Q)2026
The degree of dissociation of a weak electrolyte, is related to van't Hoff factor by the expression:
Q41mediummcqChemistryFIITJEE AIEEE 2011 (Set Q)2026
A vessel at contains with a pressure of . Some of the is converted into on the addition of graphite. If the total pressure at equilibrium is , the value of is:
Q42easymcqChemistryNEET (UG) 20242026
Activation energy of any chemical reaction can be calculated if one knows the value of:
Q43mediummcqChemistryFIITJEE AIEEE 2011 (Set Q)2026
The rate of a chemical reaction doubles for every rise of temperature. If the temperature is raised by , the rate of the reaction increases by about:
Q44mediummcqChemistryFIITJEE AIEEE 2011 (Set Q)2026
A gas absorbs a photon of and emits at two wavelengths. If one of the emissions is at , the other is at:
Q45mediummcqChemistryFIITJEE AIEEE 2011 (Set Q)2026
Ethylene glycol is used as an antifreeze in a cold climate. Mass of ethylene glycol which should be added to of water to prevent it from freezing at will be: ( for water , and molar mass of ethylene glycol )
Q46mediummcqChemistryFIITJEE AIEEE 2011 (Set Q)2026
A aqueous solution of methyl alcohol, , is supplied. What is the mole fraction of methyl alcohol in the solution?
Q47hardmcqChemistryFIITJEE AIEEE 2011 (Set Q)2026
The entropy change involved in the isothermal reversible expansion of of an ideal gas from a volume of to a volume of at is:
Q48mediummcqChemistryJEE Main2026
The molarity of a solution obtained by mixing of with of will be:
Q49mediummcqChemistryJEE Main2026
The first ionization potential of is . The value of electron gain enthalpy of will be:
Q50mediummcqChemistryJEE Main2026
How many litres of water must be added to of an aqueous solution of with a of to create an aqueous solution with of ?
Q51mediummcqChemistryJEE Main2026
Experimentally it was found that a metal oxide has formula . Metal is present as and in its oxide. Fraction of the metal which exists as would be:
Q52mediummcqChemistryNEET (UG) 20242026
According to Arrhenius equation, the plot of vs yields a:
image
Q53hardmcqChemistryNEET (UG) 20242026
The work done during reversible isothermal expansion of one mole of hydrogen gas at from a pressure of to is:(Given , )
Q54mediummcqChemistryNEET (UG) 20242026
Mass of copper deposited by passing of current through copper sulfate solution for is:(Given: Molar mass of , )
Q55hardmcqChemistryNEET (UG) 20242026
Consider the following reaction in a sealed vessel at equilibrium with concentrations: , , and . If of is taken in a closed vessel, what will be the degree of dissociation () of at equilibrium?
Q56hardmcqChemistryNEET (UG) 20242026
The plot of osmotic pressure () vs concentration ( in ) for a solution gives a straight line with slope . The temperature at which the measurement is done is:(Use )
Q57hardmcqChemistryFIITJEE AIEEE 2011 (Set Q)2026
In a face centred cubic lattice, atom A occupies the corner positions and atom B occupies the face centre positions. If one atom of B is missing from one of the face centred points, the formula of the compound is:
Q58mediummcqChemistryJEE Main2026
The coagulating power of electrolytes having ions , and for arsenic sulphide sol increases in the order:
Q59mediummcqChemistryJEE Main2026
Energy of an electron is given by . Wavelength of light required to excite an electron in a hydrogen atom from level to will be ( and ):
Q60mediummcqChemistryJEE Main2026
A piston filled with of an ideal gas expands reversibly from to at a constant temperature of . As it does so, it absorbs of heat. The values of and for the process will be ():
Q61mediummcqChemistryJEE Main2026
For gaseous state, if most probable speed is denoted by , average speed by and root mean square speed by , then for a large number of molecules the ratios of these speeds are:
Q62mediummcqChemistryJEE Main2026
The rate of a reaction doubles when its temperature changes from to . Activation energy of such a reaction will be ( and ):
Q63mediummcqChemistryNEET (UG) 20242026
The rate of a reaction quadruples when temperature changes from to . Calculate the energy of activation. (Given )
Q64easymcqChemistryNEET (UG) 20242026
Match List I with List II regarding quantum numbers:
image
Q65mediummcqChemistryJEE Main2026
Consider the following reaction:

The values of and in the reaction are, respectively:
Q66mediummcqChemistryJEE Main2026
Given: Based on the data given above, the strongest oxidising agent will be:
Q67mediummcqChemistryChemistry
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The vapour pressure of two liquids P and Q are 80 and 60 torr, respectively. The total vapour pressure of solution obtained by mixing 3 moles of P and 2 moles of Q would be :
Q68mediummcqChemistryChemistry
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A reaction occurs spontaneously if :
Q69mediummcqChemistryChemistry
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Which of the following pairs of a chemical reaction is certain to result in a spontaneous reaction ?
Q70easymcqChemistryChemistry
A gas such as carbon monoxide would be most likely to obey the ideal gas law at:
Q71mediummcqChemistryChemistry
The ease of adsorption of the hydrated alkali metal ions on an ion-exchange resin follows the order:
Q72mediummcqChemistryChemistry
The heat of combustion of carbon to is . The heat released upon formation of of from carbon and oxygen gas is:
Q73hardmcqChemistryChemistry
of a magnesium carbonate sample decomposes on heating to give carbon dioxide and magnesium oxide. What will be the percentage purity of magnesium carbonate in the sample? (Atomic weight: , , )
Q74mediummcqChemistryChemistry
Equimolar solutions of the following substances were prepared separately. Which one of these will record the highest pH value?
Q75mediummcqChemistryChemistry
Which one of the following statements is INCORRECT about enzyme catalysis?
Q76mediummcqChemistryChemistry
What is the mole fraction of the solute in a aqueous solution?
Q77easymcqChemistryChemistry
The correct statement regarding defects in crystalline solids is:
Q78mediummcqChemistryChemistry
Maximum number of electrons in a subshell with and is:
Q79mediummcqChemistryChemistry
The rate constant of the reaction is . If the concentration of is , then concentration of after minutes is:
Q80hardmcqChemistryChemistry
What is the pH of the resulting solution when equal volumes of and are mixed?
Q81mediummcqChemistryChemistry
The enthalpy of fusion of water is . The molar entropy change for the melting of ice at is:
Q82mediummcqChemistryChemistry
The correct set of four quantum numbers for the valence electron of rubidium atom () is:
Q83hardmcqChemistryChemistry
What is the mass of the precipitate formed when of solution of is mixed with of solution?
Q84mediummcqChemistryChemistry
In a reaction, , rate is doubled when the concentration of is doubled, and rate increases by a factor of when the concentrations of both the reactants ( and ) are doubled. The rate law for the reaction can be written as:
Q85easymcqChemistryChemistry
Which is the correct order of increasing energy of the listed orbitals in the atom of titanium? (At. No. )
Q86mediummcqChemistryChemistry
Limiting molar conductivity of (i.e., ) is equal to:
Q87mediummcqChemistryChemistry
The number of octahedral void(s) per atom present in a cubic close-packed structure is:
Q88mediummcqChemistryChemistry
In a zero-order reaction for every rise of temperature, the rate is doubled. If the temperature is increased from to , the rate of the reaction will become:
Q89mediummcqChemistryChemistry
For a first order reaction A → B, the reaction rate at reactant concentration of 0.01 M is found to be 2.0 x 10^-5 mol L^-1 s^-1. The half life period of the reaction is :
Q90mediummcqChemistryChemistry
In Freundlich Adsorption isotherm, the value of is:
Q91mediummcqChemistryChemistry
In which of the following reactions, standard reaction entropy change () is positive and standard Gibb’s energy change () decreases sharply with increasing temperature?
Q92mediummcqChemistryChemistry
Standard enthalpy of vapourisation for water at is . The internal energy of vapourisation of water at (in ) is:
Q93mediummcqChemistryChemistry
Buffer solutions have constant acidity and alkalinity because:
Q94mediummcqChemistryChemistry
The formation of the oxide ion, , from oxygen atom requires first an exothermic and then an endothermic step as shown below: Thus the process of formation of in gas phase is unfavourable though is isoelectronic with neon. It is due to the fact that:
Q95mediummcqChemistryChemistry
If the equilibrium constant for is , the equilibrium constant for will be:
Q96mediummcqChemistryChemistry
and are the vapour pressure of pure liquid components and , respectively, of an ideal binary solution. If represents the mole fraction of component , the total pressure of the solution will be:
Q97mediummcqChemistryChemistry
pH of a saturated solution of is 12. The value of solubility product () of is:
Q98mediummcqChemistryChemistry
Which one of the following pairs of solution is not an acidic buffer?
Q99easymcqChemistryChemistry
Aqueous solution of which of the following compounds is the best conductor of electric current?
Q100mediummcqChemistryChemistry
of each gas and of gas takes and seconds respectively for effusing through a pin hole under the similar conditions. If molecular mass of gas is , the molecular mass of gas will be:
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