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7 months ago

Class 11th Chemistry NCERT Exemplar Solutions Class 11th Chapter Seven

Assertion (A): An aqueous solution of ammonium acetate can act as a buffer.

 Reason (R) : Acetic acid is a weak acid and NH4OH is a weak base.

(i) Both A and R are true and R is correct explanation of A.

(ii) Both A and R are true but R is not correct explanation of A.

(iii) A is false but R is true.

(iv) Both A and R are false.
0 Follower 1 View

V
Vishal Baghel

Contributor-Level 10

This is a Assertion and Reason Type Questions as classified in NCERT Exemplar

Ans:  option (iii)

Salt of weak acid and weak base can form buffer solution.

New answer posted

7 months ago

Class 11th Chemistry NCERT Exemplar Solutions Class 11th Chapter Seven

Assertion (A) : Aqueous solution of ammonium carbonate is basic.

Reason (R) : Acidic/basic nature of a salt solution of a salt of weak acid and weak base depends on Ka and Kb value of the acid and the base forming it.

(i) Both A and R are true and R is correct explanation of A.

(ii) Both A and R are true but R is not correct explanation of A.

(iii) A is true but R is false.

(iv) Both A and R are false.
0 Follower 2 Views

V
Vishal Baghel

Contributor-Level 10

This is a Assertion and Reason Type Questions as classified in NCERT Exemplar

Ans: Ka and Kb values are responsible for acidic and basic characters of substances. Hence option (i) is the correct answer.

New answer posted

7 months ago

Class 11th Chemistry NCERT Exemplar Solutions Class 11th Chapter Seven

Assertion (A): For any chemical reaction at a particular temperature, the equilibrium constant is fixed and is a characteristic property.

Reason (R) : Equilibrium constant is independent of temperature.

(i) Both A and R are true and R is correct explanation of A.

(ii) Both A and R are true but R is not correct explanation of A.

(iii) A is true but R is false.

(iv) Both A and R are false
0 Follower 1 View

V
Vishal Baghel

Contributor-Level 10

This is a Assertion and Reason Type Questions as classified in NCERT Exemplar

Ans: option (iii)

The equilibrium constant for an exothermic reaction (negative H) decreases as the temperature increases. The equilibrium constant for an endothermic reaction (positive H) increases as the temperature increases.

New answer posted

7 months ago

Class 11th Chemistry NCERT Exemplar Solutions Class 11th Chapter Seven

Assertion (A): The ionisation of hydrogen sulphide in water is low in the presence of hydrochloric acid.

 Reason (R) : Hydrogen sulphide is a weak acid.

(i) Both A and R are true and R is correct explanation of A.

(ii) Both A and R are true but R is not correct explanation of A.

(iii) A is true but R is false

(iv) Both A and R are false
0 Follower 1 View

V
Vishal Baghel

Contributor-Level 10

This is a Assertion and Reason Type Questions as classified in NCERT Exemplar

Ans: option (ii)

In presence of H+ ion, equilibrium shifts in backward direction.

New answer posted

7 months ago

Class 11th Chemistry NCERT Exemplar Solutions Class 11th Chapter Seven

Assertion (A) : A solution containing a mixture of acetic acid and sodium acetate maintains a constant value of pH on addition of small amounts of acid or alkali.

Reason (R) : A solution containing a mixture of acetic acid and sodium acetate acts as a buffer solution around pH 4.75.

(i) Both A and R are true and R is correct explanation of A.

(ii) Both A and R are true but R is not the correct explanation of A.

(iii) A is true but R is false.

(iv) Both A and R are false.
0 Follower 4 Views

V
Vishal Baghel

Contributor-Level 10

This is a Assertion and Reason Type Questions as classified in NCERT Exemplar

Ans: option (ii)

The solutions which resist change in pH on dilution or with the addition of small amounts of acid or alkali are called buffer solutions.

New answer posted

7 months ago

Class 11th Chemistry NCERT Exemplar Solutions Class 11th Chapter Seven

In the following questions a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the choices given below each question.

Assertion (A) : Increasing order of acidity of hydrogen halides is HF < HCl < HBr < HI

Reason (R) : While comparing acids formed by the elements belonging to the same group of periodic table, H–A bond strength is a more important factor in determining acidity of an acid than the polar nature of the bond.

(i) Both A and R are true and R is the correct explanation of A.

(ii) Both A and R are true but R is not the correct explanation of A.

(iii) A is true but R is false.

(iv) Bot

...more
0 Follower 1 View

V
Vishal Baghel

Contributor-Level 10

This is a Assertion and Reason Type Questions as classified in NCERT Exemplar

Ans: option (i)

 As, H-A bond strength is a more important factor in determining acidity than its polar nature. As the size of A increases down the group, H-A bond strength decreases.

New answer posted

7 months ago

Class 11th Chemistry NCERT Exemplar Solutions Class 11th Chapter Seven

Match Column (I) with Column (II). Column I Column II-

(i) Equilibrium

(a) ∆G > 0, K < 1

(ii) Spontaneous reaction

(b) ∆G = 0

(iii) Nonspontaneous reaction

(c) ∆Gᶱ = 0
 

(d) ∆G < 0, K > 1
0 Follower 3 Views

V
Vishal Baghel

Contributor-Level 10

This is a Matching Type Questions as classified in NCERT Exemplar

Ans: (i) →c; (ii) → (d); (iii) → (a).

New answer posted

7 months ago

Class 11th Chemistry NCERT Exemplar Solutions Class 11th Chapter Seven

Match the following graphical variation with their description-

                A                                                                                                B 

(a) Variation in product concentration with time

 

(b) Reaction at equilibrium

(c) Variation in reactant concentration with time
0 Follower 9 Views

V
Vishal Baghel

Contributor-Level 10

This is a Matching Type Questions as classified in NCERT Exemplar

Ans: (i) → (c); (ii) → (a); (iii) → (b).

New answer posted

7 months ago

Class 11th Chemistry NCERT Exemplar Solutions Class 11th Chapter Seven

Match the following species with the corresponding conjugate acid.

               Species

          Conjugate acid

(i) NH3

(a) CO32–

(ii) HCO3-

(b) NH4

(iii) H2O

(c) H3O+

(iv) HSO4-

(d) H2SO4

 

(e) H2CO3
0 Follower 4 Views

V
Vishal Baghel

Contributor-Level 10

This is a Matching Type Questions as classified in NCERT Exemplar

Ans: (i) → (b); (ii) → (e); (iii) → (c); (iv) → (d)

New answer posted

7 months ago

Class 11th Chemistry NCERT Exemplar Solutions Class 11th Chapter Seven

Match standard free energy of the reaction with the corresponding equilibrium constant.

(i) ∆Gᶱ > 0

(a) K > 1

(ii) ∆Gᶱ < 0

(b) K = 1

(iii) ∆Gᶱ = 0

(c) K = 0

 

(d) K < 1
0 Follower 3 Views

V
Vishal Baghel

Contributor-Level 10

This is a Matching Type Questions as classified in NCERT Exemplar

Ans: (i) → (d); (ii) → (a); (iii) → (b).

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