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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

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
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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

4 months ago

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

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.
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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

...more

New answer posted

4 months ago

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

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
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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

4 months ago

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

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.
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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

4 months ago

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

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

4 months ago

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

For the reaction H2(g) + I2(g) ⇌ 2HI (g), the standard free energy is ∆Gᶱ > 0. The equilibrium constant (K ) would be __________.

(i) K = 0

(ii) K > 1

(iii) K = 1

(iv) K < 1
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Vishal Baghel

Contributor-Level 10

This is a Multiple Choice Questions as classified in NCERT Exemplar

Ans: Option(iv)

 The given chemical reaction is:

H2(g) + I2(g) ? 2HI (g)

By, thermodynamical equation of equilibrium,

?G?= -RTlnk>0

Now, R>0 & T>0

⇒ −lnK > 0

⇒    K<1

New answer posted

4 months ago

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

We know that the relationship between Kc and Kp is

Kp = Kc (RT)∆n What would be the value of ∆n for the reaction

NH4Cl (s) ⇌ NH3 (g) + HCl (g)

(i) 1

(ii) 5

(iii) 5

(iv) 2
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V
Vishal Baghel

Contributor-Level 10

This is a Multiple Choice Questions as classified in NCERT Exemplar

Ans:  Option(iv)

The relationship between Kp and Kc is

Kp=Kc(RT)Δn

Where ?n = (number of moles of gaseous products) – (number of moles of gaseous reactants)

For the reaction,

NH4C1(s)?NH3(g)+HCl(g)

Δn=2–0=2

New answer posted

4 months ago

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

Following data is given for the reaction: CaCO3 (s) → CaO (s) + CO2 (g)

 ∆fHᶱ [CaO(s)] = – 635.1 kJ mol–1

 ∆fHᶱ[CO2(g)] = – 393.5 kJ mol–1

∆fHᶱ[CaCO3(s)] = – 1206.9 kJ mol–1

Predict the effect of temperature on the equilibrium constant of the above reaction.
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Vishal Baghel

Contributor-Level 10

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

Ans:  ΔrH?= ?fH? [CaO(s)]+ ?fH?[CO2(g)]− ?fH?[ [CaCO3(s)]

∴ ?fH? =178.3kJ mol−1.

The reaction is endothermic. Hence, according to Le Chatelier's principle, reaction will proceed in forward direction on increasing temperature.

New answer posted

4 months ago

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

A reaction between ammonia and boron trifluoride is given below: :

 NH3 + BF3 → H3N : BF3 Identify the acid and base in this reaction. Which theory explains it? What is the hybridisation of B and N in the reactants?
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Vishal Baghel

Contributor-Level 10

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

Ans: As, NH3 is Lewis base while BF3  is Lewis acid. Lewis electronic theory of acids and bases explains it. Hybridisation state: N in NH3 is sp3 hybridised and Boron in BF3 is sp2 hybridised.

New answer posted

4 months ago

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

Calculate the volume of water required to dissolve 0.1 g lead (II) chloride to get a saturated solution. (Ksp of PbCl2 = 3.2 * 10–8 , atomic mass of Pb = 207 u).
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Vishal Baghel

Contributor-Level 10

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

Ans:

Ksp=3.2 * 10-8

PbCl2? Pb2+ +2Cl-

Ksp= (S) (2S)2

Ksp=4S3

s3=43.2 * 10-8

s3=8 * 10-9

s=2 * 10-3

Molar   mass   of   PbCl2=278g/mol   

By using Molarity formula,      

2 * 10-3= 278 *  x0.1

x= 0.1 278   *   2   *   10 - 3

 

= 100 278   *   2  

x=0.18L   

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