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Ncert Solutions Chemistry Class 11th

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5 months ago

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

Discuss briefly de-mineralisation of water by ion exchange resin.
0 Follower 2 Views

P
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+ 

...more

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5 months ago

Ncert Solutions Chemistry 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
0 Follower 1 View

V
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.

New answer posted

5 months ago

Ncert Solutions Chemistry 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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P
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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New answer posted

5 months ago

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

The pH of neutral water at 25°C is 7.0. As the temperature increases, ionisation of water increases, however, the concentration of H+ ions and OH– ions are equal. What will be the pH of pure water at 60°C?

(i) Equal to 7.0

(ii) Greater than 7.0

(iii) Less than 7.0

(iv) Equal to zero
0 Follower 3 Views

V
Vishal Baghel

Contributor-Level 10

This is a Multiple Choice Questions as classified in NCERT Exemplar

Ans: As Kw increases Ans: As Kw increases [H+] [OH-] > 10-14

[H+]= [OH-]

[H+]= [OH-] [H+]2 = 110-14

[H+] > 10-7

New answer posted

5 months ago

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

When hydrochloric acid is added to cobalt nitrate solution at room temperature, the following reaction takes place and the reaction mixture becomes blue. On cooling the mixture it becomes pink. On the basis of this information mark the correct answer.

[Co (H2O)6] 3+ (aq) + 4Cl– (aq) ⇌ [CoCl4]2– (aq) + 6H2O (l)

(pink)                                  (blue)

(i) ∆H > 0 for the reaction

(ii) ∆H < 0 for the reaction

(iii) ∆H = 0 for the reaction

(iv) The sign of ∆H cannot be predicte

...more
0 Follower 2 Views

V
Vishal Baghel

Contributor-Level 10

This is a Multiple Choice Questions as classified in NCERT Exemplar

Ans: option (i)

On cooling the mixture reaction moves towards backward direction it means it is an endothermic reaction i.e.,

New answer posted

5 months ago

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

Which of the following statements is incorrect?

(i) In equilibrium mixture of ice and water kept in perfectly insulated flask mass of ice and water does not change with time.

(ii) The intensity of red colour increases when oxalic acid is added to a solution containing iron

(III) nitrate and potassium thiocyanate.

(iii) On addition of catalyst the equilibrium constant value is not affected.

(iv) Equilibrium constant for a reaction with negative ?H value decreases as the temperature increases.
0 Follower 2 Views

V
Vishal Baghel

Contributor-Level 10

This is a Multiple Choice Questions as classified in NCERT Exemplar

Ans:  option (ii)

The intensity of red colour increases when oxalic acid is added to a solution containing iron (III) nitrate and potassium thiocyanate.
Iron (III) nitrate and potassium thiocyanate react to give deep red coloration.
The reaction is:
Fe3 + aq + SCN−↔ [FeSCN]2 + aq
yellow deep red
Now, to this solution, if oxalic acid  (H2C2O4) is added, then it reacts with Fe3+ ions to form the stable complex ion  [Fe (C2O4)3]3−, thus decreasing the concentration of Fe3+ ions. In accordance with the Le-Chatelier's principle, the de

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5 months ago

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

Give reasons:

(i) Lakes freeze from top towards bottom.

(ii) Ice floats on water.
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P
Payal Gupta

Contributor-Level 10

(i) During winter, the temperature of lake water keeps on decreasing. Since cold water is heavier, it moves towards the bottom.

(ii) Density of ice is less than that of water that is why it floats on the surface of water.

New answer posted

5 months ago

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

PCl5, PCl3 and Cl2 are at equilibrium at 500K in a closed container and their concentrations are 0.8 * 10–3 mol L–1, 1.2 * 10–3 mol L–1 and 1.2 * 10–3 mol L–1 respectively. The value of Kc for the reaction PCl5 (g) ⇌PCl3 (g) + Cl2 (g) will be

(i) 1.8 * 103 mol L–1

(ii) 1.8 * 10–3

(iii) 1.8 * 10–3 L mol–1

(iv) 0.55 * 104
0 Follower 4 Views

V
Vishal Baghel

Contributor-Level 10

This is a Multiple Choice Questions as classified in NCERT Exemplar

Ans: The given reaction is :-

PCl5(g)?PCl3(g)+Cl2(g)

KC= [ P C l 3 ] [ C l 2 ] [ P C l 5 ]

=1.2*10−3 *1.2*10−3 0.8*10−3 [ 1.2 * 10 - 3 * 1.2 * 10 - 3 ] [ 0.8 * 10 - 3 ]

=1.8*10−3molL−1

New answer posted

5 months ago

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

Which of the following is not a general characteristic of equilibria involving physical processes?

(i) Equilibrium is possible only in a closed system at a given temperature.

(ii) All measurable properties of the system remain constant.

(iii) All the physical processes stop at equilibrium.

(iv) The opposing processes occur at the same rate and there is dynamic but stable condition.
0 Follower 1 View

V
Vishal Baghel

Contributor-Level 10

This is a Multiple Choice Questions as classified in NCERT Exemplar

Ans: option (iii)

A physical equilibrium is having dynamic nature, both forward and reverse process occur at equal rates. Some kind of motion is always present. The individual molecules continuously move from one phase to another.

New answer posted

5 months ago

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

Which of the following is not a general characteristic of equilibria involving physical processes?

(i) Equilibrium is possible only in a closed system at a given temperature.

(ii) All measurable properties of the system remain constant.

(iii) All the physical processes stop at equilibrium.

(iv) The opposing processes occur at the same rate and there is dynamic but stable condition.
0 Follower 1 View

V
Vishal Baghel

Contributor-Level 10

This is a Multiple Choice Questions as classified in NCERT Exemplar

Ans: option (iii)

A physical equilibrium is having dynamic nature, both forward and reverse process occur at equal rates. Some kind of motion is always present. The individual molecules continuously move from one phase to another.

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