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Chemistry NCERT Exemplar Solutions Class 11th Chapter Seven

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4 months ago

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

A sparingly soluble salt having general formula A^p+_x B^q- _y and molar solubility S is in equilibrium with its saturated solution. Derive a relationship between the solubility and solubility product for such salt.

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Vishal Baghel

Contributor-Level 10

This is a Long Answer Type Questions as classified in NCERT Exemplar

The equation can be written as-

A^p+_x+ B^q- _y? xA^p+ (aq) + yB^q-

S moles of A and B dissolves to give x S moles of A^p+and y S moles of Bq-.

K_sp = [A^p+]^x [B^q-]^y = [x5]^x [y5]^y

= x^xy^y5^x+y

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

Assertion (A): In the dissociation of PCl₅ at constant pressure and temperature addition of helium at equilibrium increases the dissociation of PCl₅ .

Reason (R) : Helium removes Cl₂ from the field of action.

(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.

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Vishal Baghel

Contributor-Level 10

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

Ans: option (iv)

If the volume is kept constant and an inert gas such as argon is added which does not take part in the reaction, the equilibrium remains undisturbed.

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

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.

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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.

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

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 K_aand K_b 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.

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Vishal Baghel

Contributor-Level 10

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

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

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

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

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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.

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

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

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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.

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

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.

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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.

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

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

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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.

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

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