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Most important assertion-reason and case study of all the chapters of chemistry in class 12 with answers
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KENDRIYA VIDYALAYA SANGATHANBENGALURU REGION
CHEMISTRY
CLASS- XII
2023-24
, ASSERTION-REASON QUESTIONS
CHAPTER: SOLUTIONS
Read the Assertion and Reason statements and choose the appropriate option from below:
A) Both A and R are true and R is the correct explanation of A
B) Both A and R are true and R is not the correct explanation of A
C) A is true but R is false
D) A is false but R is true
1. Assertion: Colligative properties depend on the nature of the solute, not its chemical identity.
Reason: Colligative properties are related to the number of solute particles in the solution.
2. Assertion: Henry's law is not applicable to solutions with high solute concentrations.
Reason: Henry's law assumes the solute concentration is low, and the solution behaves ideally.
3. Assertion: The boiling point of a solution is always higher than the boiling point of the pure
solvent.
Reason: Boiling point elevation is a colligative property, and it depends on the concentration
of solute particles in the solution.
4. Assertion: Adding more non-volatile solute to a solution will increase its osmotic pressure.
Reason: Osmotic pressure is directly proportional to the molality of the solute.
5. Assertion: Solutions with positive deviations from Raoult's law exhibit ideal behavior.
Reason: In such solutions, the interactions between the solute and solvent are weaker than
between solute-solute and solvent-solvent.
6. Assertion : Azeotropic mixtures are formed only by non-ideal solutions and they may have
boiling points either greater than both the components or less than both the components.
Reason : The composition of the vapour phase is same as that of the liquid phase of an
azeotropic mixture.
7. Assertion : When methyl alcohol is added to water, boiling point of water increases.
Reason : When a NON volatile solute is added to a volatile solvent elevation in boiling point is
observed.
8. Assertion : Molarity of a solution in liquid state changes with temperature.
Reason : The volume of a solution changes with change in temperature.
9. Assertion : If a liquid solute more volatile than the solvent is added to the solvent, the vapour
pressure of the solution may increase i.e., ps > po.
Reason : In the presence of a more volatile liquid solute, only the solute will form the vapours
and solvent will not.
10. Assertion : When a solution is separated from the pure solvent by a semi- permeable
membrane, the solvent molecules pass through it from pure solvent side to the solution side
Reason : Diffusion of solvent occurs from a region of high concentration solution to a region of
low concentration solution.
ANSWERS:
1 2 3 4 5 6 7 8 9 10
D A A C D B D A C D
, CHAPTER: ELECTROCHEMISTRY
Read the Assertion and Reason statements and choose the appropriate option from below:
a) Both assertion and reason are correct and reason is the correct explanation of the assertion
b) Both assertion and reason are correct and reason is not the correct explanation of the assertion
c) Assertion is correct but reason is incorrect
d) Assertion is wrong Reason is correct.
1 Assertion: The electrode potential of SHE is zero
Reason: In SHE HCl 1M and H2 gas at one bar pressure is taken
2 Assertion: H+ ion cannot oxidize copper
Reason: Reduction potential of Cu2+/ Cu is greater than H+/H2
3 Assertion: The reduction potential of F-/F is highest among all electrodes
Reason: Fluorine is the strongest oxidising agent
4 Assertion: Electronic conduction decreases with temperature
Reason: The flow of electrons hindered on increasing the temperature
5 Assertion: conductivity decreases with increasing dilution
Reason: No of ions increases per unit volume increases with dilution.
6 Assertion: Electrolytic conduction increases with temperature
Reason: On increasing the temperature mobility of ion increases
7 Assertion: Molar conductivity of electrolytes decreases with dilution
Reason: For weak electrolytes degree of dissociation increases with dilution.
8 Assertion: It is difficult to measure the conductivity of ionic solutions
Reason: Electrolytes conduct electricity and undergoes chemical change.
9 Assertion: Molar conductivity of strong electrolytes increases with dilution
Reason: On dilution inter ionic interaction increases.
10 Assertion: Molar conductivity of acetic acid increases sharply with dilution
Reason: Degree of dissociation of acetic acid decreases with dilution
11 Assertion: An external potential of 1.1V is passed through Daniel cell, no current flow through
it.
Reason: Standard emf of galvanic cell is 1.1 volt.
12 Assertion: Out of Li and K Potassium is the strongest reducing agent
Reason: Reduction potential of K is greater than that of Li.
13 Assertion: Electrolytic conduction of electrolytes depends on size of ions
Reason: Larger the size of ion lesser will be the mobility of ions.
14 Assertion: Limiting molar conductivity of weak electrolytes can be obtained graphically
Reason: Limiting molar conductivity of weak electrolytes increases with dilution.
15 Assertion: Electrolysis of aqueous NaCl produces Oxygen at the anode
Reason: Oxidation potential of Oxygen is lower than chlorine.
ANSWERS: 1) b 2) a 3) b 4) a 5) c 6) a 7) d 8) a 9) c 10) c 11) b 12) d 13) a 14) b 15) d
, CHAPTER: CHEMICAL KINETICS
Read the Assertion and Reason statements and choose the appropriate option from below:
A) Both A and R are true and R is the correct explanation of A
B) Both A and R are true and R is not the correct explanation of A
C) A is true but R is false
D) A is false but R is true
1. Assertion: Increasing the pressure of reactants can increase the rate of a reaction.
Reason:Higher pressure can increase the frequency of collisions between reactant molecules.
2. Assertion:A reaction with a negative ΔG will always proceed at a fast rate.
Reason:The rate of a reaction depends not only on thermodynamics (ΔG) but also on kinetics.
3. Assertion: In rate laws the exponents for concentration do not necessarily match the
stoichiometric coefficients.
Reason: It is the mechanism and not the balanced chemical equation for the overall change
that governs the reaction rate
4. Assertion: The presence of a catalyst increases the activation energy of a reaction.
Reason: Catalysts provide an alternative reaction pathway with a lower activation energy.
5. Assertion: The Arrhenius equation explains the temperature dependence of rate of a reaction
Reason: Plots of log k vs1/t are linear and the energy of activation is obtained from such plots.
6. Assertion: The order and molecularity of a reaction are always the same.
Reason: Order is determined experimentally whereas molecularity by a balanced elementary
reaction.
7. Assertion: Average rate and instantaneous rate of a reaction have the same unit.
Reason: Average rate becomes an instantaneous rate when the time interval is too small.
8. Assertion: Hydrolysis of methyl ethanoate is a pseudo-first-order reaction.
Reason: Water is present in large excess and therefore its concentration remained constant
throughout the reaction.
9. Assertion: Activation complex for the forward reaction will have lower energy than that for the
backward reaction in an exothermic reaction.
Reason: Reactants have greater energy than products for an exothermic reaction.
10. Assertion: The unit of the rate constant is independent of the order of the reaction.
Reason: The power of concentration terms in the rate equation keeps changing with change in
order.
ANSWERS:
1 2 3 4 5 6 7 8 9 10
A D A D B D B A D D
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