Equilibrium — DPP 1

20 NEET questions from Equilibrium, with answers and explanations. Attempt it as a timed test to get scoring, accuracy breakdown and mistake tracking.

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1
The molar concentration of 96 g of $\mathrm { O } _ { 2 }$ contained in a 2 L vessel is:
  1. A $16 \mathrm {~mol} / \mathrm { L }$.
  2. B $1.5 \mathrm {~mol} / \mathrm { L }$.
  3. C $4 \mathrm {~mol} / \mathrm { L }$.
  4. D $24 \mathrm {~mol} / \mathrm { L }$.
Show answer

Correct answer: B

2
If $\mathrm { pK } _ { \mathrm { b } } > \mathrm { pK } _ { \mathrm { a } }$ then the solution of the salt of a weak acid and weak base will be:
  1. A neutral.
  2. B acidic.
  3. C basic.
  4. D amphoteric.
Show answer

Correct answer: B

3
$\mathrm { K } _ { \mathrm { sp } }$ of AgBr is $5 \times 10 ^ { - 13 }$. Precipitation of AgBr will take place in a solution having :
  1. A $0.1 \mathrm {~M } \mathrm {~AgNO } _ { 3 }$ and $5 \times 10 ^ { - 12 } \mathrm {~M } \mathrm {~NaBr }$
  2. B $5 \times 10 ^ { - 12 } \mathrm {~M } \mathrm {~AgNO } _ { 3 }$ and 0.1 M NaBr
  3. C $2 \times 10 ^ { - 6 } \mathrm {~M } \mathrm {~AgNO } _ { 3 }$ and $4 \times 10 ^ { - 8 } \mathrm {~M } \mathrm {~NaBr }$
  4. D $2 \times 10 ^ { - 6 } \mathrm {~M } \mathrm {~AgNO } _ { 3 }$ and $4 \times 10 ^ { - 6 } \mathrm {~M } \mathrm {~NaBr }$
Show answer

Correct answer: D

4
For the reversible reaction
$\mathrm{N}_{2}(\mathrm{g})+3 \mathrm{H}_{2}(\mathrm{g}) \leftrightharpoons 2 \mathrm{NH}_{3}(\mathrm{g})+\text { Heat }$
The equilibrium shifts in forward direction
  1. A by increasing the concentration of $\mathrm{NH}_{3}(\mathrm{g})$
  2. B by decreasing the pressure
  3. C by decreasing the concentration of $\mathrm{N}_{2}$ and $\mathrm{H}_{2}$
  4. D by increasing pressure and decreasing temperature
Show answer & explanation

Correct answer: D

Le Chatelier’s principle suggests that in the formation of ammonia, the equilibrium shifts in forward direction by increasing pressure and decreasing temperature.
Therefore, option (4) is the correct answer.
5
In a vessel containing $\mathrm { SO } _ { 3 } , \mathrm { SO } _ { 2 }$ and $\mathrm { O } _ { 2 }$ at equilibrium, some helium gas is introduced such that the temperature and volume remains constant. According to the Le-Chatelier principle, the dissociation of $\mathrm { SO } _ { 3 }$ :
  1. A increases.
  2. B decreases.
  3. C remains unaltered.
  4. D is equal to dissociation of O₂
Show answer

Correct answer: C

6
If $0.5 \mathrm {~mol} \mathrm {~H } _ { 2 }$ is reacted with $0.5 \mathrm {~mol} \mathrm {~I } _ { 2 }$ in a 10 L container at $444 ^ { \circ } \mathrm { C }$ and at the same temperature value of equilibrium constant $\mathrm { K } _ { \mathrm { c } }$ is 49 , the ratio of $\left[ \mathrm { H } _ { 2 } \right]$ and $\left[ \mathrm { I } _ { 2 } \right]$ at equilibrium will be:
  1. A 1
  2. B $\frac { 1 } { 7 }$
  3. C $\sqrt { \frac { 1 } { 7 } }$
  4. D 49
Show answer

Correct answer: A

7
Which of the following pairs constitutes a buffr?
  1. A NaOH and HCl
  2. B HNO$_{3}$ and NH$_{4}$NO$_{3}$
  3. C HCl and KCl
  4. D HNO$_{2 }$ and NaNO$_{2}$
Show answer & explanation

Correct answer: D

HNO$_{2}$ and NaNO$_{2}$ represent a buffr mixture.
Therefore, option (4) is the correct answer.
8
The pH of a solution of hydrochloric acid is 4. The molarity of the solution is:
  1. A 4.0
  2. B 0.4
  3. C 0.0001
  4. D 0.04
Show answer & explanation

Correct answer: C

pH = – log[H$^{+}$], Here [H$^{+}$] = 10$^{–4}$, Molarity = 0.0001 M
Therefore, option (3) is the correct answer.
9
What will be the pH of the solution, if 0.01 mole of HCl is dissolved in a buffr solution containing 0.03 mole of propanoic acid (K$_{a}$ = 1.0 × 10$^{–5}$) and 0.02 moles of salt, at 25ºC?
  1. A 3.699
  2. B 4.4
  3. C 5.11
  4. D 6.11
Show answer & explanation

Correct answer: B

$\begin{aligned} \mathrm{pH} & =\mathrm{pK}_{a}+\log \frac{[\text { Salt }]}{[\text { Acid }]} \\ & =-\log \left(1.0 \times 10^{-5}\right)+\log \frac{(0.02-0.01)}{(0.03+0.01)}\end{aligned}$
$=5+\log \left(\frac{1}{4}\right)=5-0.6=4.4$
Therefore, option (2) is the correct answer
10
For the reaction, $\mathrm { A } + 2 \mathrm {~B} \rightleftharpoons 2 \mathrm { C } + \mathrm { D }$, the initial concentration of A is ' a ' and that of B is 1.5 times that of A. Concentrations of A and D are same at equilibrium. What should be the concentration of B at equilibrium?
  1. A $\frac { \mathrm { a } } { 4 }$
  2. B $\frac { a } { 2 }$
  3. C $\frac { 3 a } { 4 }$
  4. D All of these
Show answer

Correct answer: B

11
Le Chatelier’s principle is applicable to:
  1. A only homogeneous chemical reversible reactions.
  2. B only heterogeneous chemical reversible reactions.
  3. C only physical equilibrium.
  4. D all systems, chemical or physical in equilibrium.
Show answer & explanation

Correct answer: D

Le Chatelier’s principle is applicable to all systems, chemical or physical in equilibrium.
Therefore, option (4) is the correct answer.
12
Ostwald’s dilution law is applicable to:
  1. A Strong electrolytes only
  2. B Weak electrolyte only
  3. C Non-electrolytes
  4. D Strong and weak electrolytes
Show answer & explanation

Correct answer: B

Ostwald’s dilution law is applicable to weak electrolyte only.
Therefore, option (2) is the correct answer.
13
$\mathrm { K } _ { \mathrm { sp } }$ of AgCl is $1 \times 10 ^ { - 10 }$. Its solubility in $0.1 \mathrm {~M } \mathrm {~KNO } _ { 3 }$ will be:
  1. A $10 ^ { - 5 }$ moles/litre
  2. B $> 10 ^ { - 5 }$ moles/litre
  3. C $< 10 ^ { - 5 }$ moles/litre
  4. D None of these
Show answer

Correct answer: A

14
At $248 ^ { \circ } \mathrm { C }$, the $\mathrm { K } _ { \mathrm { p } }$ for the reaction, $\mathrm { SbCl } _ { 5 } ( \mathrm {g}) \rightleftharpoons \mathrm { SbCl } _ { 3 } ( \mathrm {g}) + \mathrm { Cl } _ { 2 } ( \mathrm {g} )$ is 1.07 atm at a total pressure of 1 atm . Calculate the degree of dissociation of $\mathrm { SbCl } _ { 5 }$.
  1. A 0.516
  2. B 0.718
  3. C 0.321
  4. D 0.426
Show answer

Correct answer: B

15
Select the correct combination:
  1. A The aqueous solution of $\mathrm { Na } _ { 2 } \mathrm { SO } _ { 4 }$ - acidic nature
  2. B The aqueous solution of $\mathrm { CH } _ { 3 } \mathrm { COONa }$ - basic nature
  3. C The aqueous solutions of NaCN - acidic nature
  4. D The aqueous solutions of $\mathrm { NH } _ { 4 } \mathrm { Cl }$ - basic nature
Show answer

Correct answer: B

16
The vapour density of $\mathrm { N } _ { 2 } \mathrm { O } _ { 4 }$ at a certain temperature is 30. What is the percentage dissociation of $\mathrm { N } _ { 2 } \mathrm { O } _ { 4 }$ at this temperature?
  1. A $53.3 \%$
  2. B $106.6 \%$
  3. C $26.7 \%$
  4. D $10.66 \%$
Show answer

Correct answer: A

17
Aniline is a very weak base. Which of the given aniline solution will have the highest degree of dissociation?
  1. A 1 M aniline
  2. B 0.1 M aniline
  3. C 0.01 M aniline
  4. D 0.02 M aniline
Show answer

Correct answer: C

18
The reaction, PCl$_{5}$ ⇌ PCl$_{3}$ + Cl₂ is started in a 5 L container by taking one mol of PCl$_{5}$. If 0.3 mol of PCl$_{5}$ is there at equilibrium, the total moles and concentration of PCl$_{3}$ and Kc will respectively be:
  1. A 0.70, 0.14, $\frac{49}{150}$
  2. B 0.30, 0.12, $\frac{23}{100}$
  3. C 0.10, 0.07, $\frac{23}{100}$
  4. D 0.05, 20, $\frac{49}{150}$
Show answer

Correct answer: A

19
In a reaction $\mathrm { A } + \mathrm { B } \rightleftharpoons \mathrm { C } + \mathrm { D }$ the rate constant of the forward reaction and backward reaction is $\mathrm { K } _ { 1 }$ and $\mathrm { K } _ { 2 }$ then the equilibrium constant $\left( \mathrm { K } _ { \mathrm { c } } \right)$ for the reaction is expressed as:
  1. A $\mathrm { K } _ { \mathrm { c } } = \frac { \mathrm { K } _ { 2 } } { \mathrm {~K} _ { 1 } }$
  2. B $\mathrm { K } _ { \mathrm { c } } = \frac { \mathrm { K } _ { 1 } } { \mathrm {~K} _ { 2 } }$
  3. C $\mathrm { K } _ { \mathrm { c } } = \mathrm { K } _ { 1 } \times \mathrm { K } _ { 2 }$
  4. D $\mathrm { K } _ { \mathrm { c } } = \mathrm { K } _ { 1 } + \mathrm { K } _ { 2 }$
Show answer

Correct answer: B

20
pH of NaCl solution is 7 at 298 K. If the solution is heated to 320 K, which of the following statement is true?
  1. A pH will decrease
  2. B pOH will increase
  3. C pH will increase
  4. D pH will decrease and pOH will increase
Show answer

Correct answer: A

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