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7 months ago

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

In which of the following solvents is silver chloride most soluble?

(i) 0.1 mol dm^–3 AgNO3 solution

(ii) 0.1 mol dm^–3 HCl solution

(iii) H₂O

(iv) Aqueous ammonia

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Vishal Baghel

Contributor-Level 10

This is a Multiple Choice Questions as classified in NCERT Exemplar

Ans: option (iv)

Aqueous ammonia will absorb chloride ions and thus the equilibria will shift in forward direction and solubility of silver chloride will increase.

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7 months ago

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

How is heavy water prepared? Compare its physical properties with those of ordinary water.

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Payal Gupta

Contributor-Level 10

This is a short answer type question as classified in NCERT Exemplar

Heavy water can be made by electrolyzing water repeatedly or as a by-product in the fertiliser industry. It's a deuterium compound that's used to make other deuterium compounds.

Physical Properties of H₂O and D₂O

Property	H₂O	D₂O
Molecular mass (g mol-1)	18.015	20.0276
Melting point/K	273.0	276.8
Boiling point/K	373.0	374.4
Enthalpy of formation/kJ mol-	-285.9	-294.6
Enthalpy of Vaporisation (373 K)/kJ mol^-1	40.66	41.61
Enthalpy of fusion/kJ mol-1	6.01	—
Temp of max. density/K	276.98	284.2
Density (298 K)/g cm-3	1.0000	1.1059
Viscosity/centipoise	0.8903	1.107
Dielectric constant/C2/N.m2	78.39	78.06

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7 months ago

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

Which of the following will produce a buffer solution when mixed in equal volumes?

(i) 0.1 mol dm^–3 NH₄OH and 0.1 mol dm^–3 HCl

(ii) 0.05 mol dm^–3 NH₄OH and 0.1 mol dm^–3 HCl

(iii) 0.1 mol dm^–3 NH₄OH and 0.05 mol dm^–3 HCl

(iv) 0.1 mol dm^–3 CH₄COONa and 0.1 mol dm^–3 NaOH

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Vishal Baghel

Contributor-Level 10

This is a Multiple Choice Questions as classified in NCERT Exemplar

Ans: option (iii)

When 0.1 mol dm^-3NH₄OH and 0.05 mol dm^-3 HCl react total amount of HCl reacts with NH₄OH to form NH₄Cl and some NH₄OH will be left unreacted. Thus, the resultant solution contains NH₄Cl and NH₄OH which will produce a buffer solution.

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7 months ago

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

Acidity of BF₃ can be explained on the basis of which of the following concepts?

(i) Arrhenius concept

(ii) Bronsted Lowry concept

(iii) Lewis concept

(iv) Bronsted Lowry as well as Lewis concept

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Vishal Baghel

Contributor-Level 10

This is a Multiple Choice Questions as classified in NCERT Exemplar

Ans: option (iii)

BF₃ is an electron deficient species that is why it is a Lewis acid. (all Lewis acid can accept a pair of electrons.

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7 months ago

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

Molecular hydrides are classified as electron deficient, electron precise and electron rich compounds. Explain each type with two examples.

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Payal Gupta

Contributor-Level 10

This is a short answer type question as classified in NCERT Exemplar

(a) Electron deficient hydrides are those that lack sufficient number of electrons to form typical covalent bonds. Group 13 hydrides, for example (BH₃, AlH₃, etc.).

(b) Electron precise: Electron precise hydrides are those that have the exact number of electrons required to form covalent bonds. Group 14 hydrides, for example (CH₄, SiH₄, GeH₄, SnH₄, PbH₄ etc.). They are tetrahedral in shape.

(c) Electron rich hydrides: Electron rich hydrides are those that have more electrons than are required to create conventional covalent bonds. Hydrides of groups 15 to 17. (NH₃, PH

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New question posted

7 months ago

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

Acidity of BF₃ can be explained on the basis of which of the following concepts?

(i) Arrhenius concept

(ii) Bronsted Lowry concept

(iii) Lewis concept

(iv) Bronsted Lowry as well as Lewis concept

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New answer posted

7 months ago

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

K_a1 , K_a2 and K_a3 are the respective ionisation constants for the following reactions.

H₂S $\to$ H⁺ + HS

HS^– $\to$ H⁺ + S²

H₂S $\to$ 2H⁺ + S²

The correct relationship between is K_a1 , K_a2 and K_a3

K_a3= K_a1 * K_a2
K_a3= K_a1 + K_a2
K_a3= K_a1 – K_a2
K_a3= K_a1 / K_a2

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Vishal Baghel

Contributor-Level 10

This is a Multiple Choice Questions as classified in NCERT Exemplar

Ans: Option(i)

H₂S?H⁺ +H^S− K_a1

HS−?H⁺+S²− K_a2

H₂S?2H⁺+S²− K_a3

K_a1= $\frac{[{H S}^{-}] [H^{+}]}{[H_{2} S]}$

K_a2= $\frac{[{H S}^{-}] [H^{+}]}{[H_{2} S]}$

K_a3=K_a1.K_a2

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7 months ago

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

Discuss briefly de-mineralisation of water by ion exchange resin.

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Payal Gupta

Contributor-Level 10

This is a short answer type question as classified in NCERT Exemplar

Water demineralization using organic or synthetic ion exchange resins (ion exchange resins):

a. Synthetic resins are insoluble polymeric solids that contain a large hydrocarbon network with reactive acidic or basic groups.

These are better than Zeolite since they can remove all kinds of cations and anions from water. Demineralised or deionised water is the product of this process.

b. There are two categories of these:

Resins for cation exchange: Acidic groups such as COOH or SO₃H can be found in them. Resin-H+-can be used to represent them.

Mg²⁺

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7 months ago

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

The ionisation constant of an acid, Ka , is the measure of strength of an acid. The Ka values of acetic acid, hypochlorous acid and formic acid are 1.74 * 10^–5, 3.0 * 10^–8 and 1.8 * 10^–4 respectively. Which of the following orders of pH of 0.1 mol dm^–3 solutions of these acids is correct?

(i) Acetic acid > hypochlorous acid > formic acid

(ii) Hypochlorous acid > acetic acid > formic acid

(iii) Formic acid > hypochlorous acid > acetic acid

(iv) Formic acid > acetic acid > hypochlorous acid

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Vishal Baghel

Contributor-Level 10

This is a Multiple Choice Questions as classified in NCERT Exemplar

Ans: option (iv)

Higher the value of Ka higher will be the acidic strength Ka value for formic acid is the highest and that will be of hypochlorous acid is the lowest.

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7 months ago

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

What do you understand about the term 'autoprotolysis of water'? What is its significance?

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Payal Gupta

Contributor-Level 10

This is a short answer type question as classified in NCERT Exemplar

Self ionization of water is known as autoprotolysis of water.

H₂O (l) + H₂O (l) → H₂O₂ (aq) + OH^- (aq)

Acid Base Conjuga

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