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31 Year NEET Previous Year Questions: Equilibrium - 3 - NEET MCQ


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31 Year NEET Previous Year Questions: Equilibrium - 3 - Question 1

The compound whose aqueous solution has the highest pH is [1988]

Detailed Solution for 31 Year NEET Previous Year Questions: Equilibrium - 3 - Question 1

NaCl is a salt of strong acid and strong base hence its aqueous solution will be neutral ie pH = 7. NaHCO3 is an acidic salt hence pH < 7 . Na2CO3 is a salt of weak acid and strong base. Hence its aqueous solution will be strongly basic ie. pH > 7.
NH4Cl is salt of weak base and strong acid, hence its aqueous solution will be strongly acidic i.e. pH < 7.

31 Year NEET Previous Year Questions: Equilibrium - 3 - Question 2

K1 and K2 are equilibrium constant for reactions (1) and (2)

Detailed Solution for 31 Year NEET Previous Year Questions: Equilibrium - 3 - Question 2

For reation (1)

and for reaction (2)

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31 Year NEET Previous Year Questions: Equilibrium - 3 - Question 3

Aqueous solution of acetic acid contains [1991]

Detailed Solution for 31 Year NEET Previous Year Questions: Equilibrium - 3 - Question 3

An aqueo us solution of acetic acid dissociates as

31 Year NEET Previous Year Questions: Equilibrium - 3 - Question 4

0.1 M solution of which one of these substances will be basic ? [1992]

Detailed Solution for 31 Year NEET Previous Year Questions: Equilibrium - 3 - Question 4

Sodium borate is a salt of strong base (NaOH) and weak acid (H3BO3). Hence its aqueous solution will be basic

31 Year NEET Previous Year Questions: Equilibrium - 3 - Question 5

Which one of the following information can be obtained on the basis of Le Chatelier principle?

Detailed Solution for 31 Year NEET Previous Year Questions: Equilibrium - 3 - Question 5

According to Le-ch atelier's principle" whenever a constraint is applied to a system in equilibrium, the system tends to readjust so as to nullify the effect of the constraint.

31 Year NEET Previous Year Questions: Equilibrium - 3 - Question 6

In which of the following solvents, AgBr will have the highest solubility ? [1992]

Detailed Solution for 31 Year NEET Previous Year Questions: Equilibrium - 3 - Question 6

AgBr has the highest solubility in 10-3 M NH4OH . All other solven ts will dissolve AgBr poorly. Moreover bromides of Ag+, Hg22+ and Cu22+ are water insoluble

31 Year NEET Previous Year Questions: Equilibrium - 3 - Question 7

According to Le-chatelier ’s principle, adding heat to a solid    liquid equilibrium will cause the

Detailed Solution for 31 Year NEET Previous Year Questions: Equilibrium - 3 - Question 7

It is an endothermic process. So when temperature is raised, more liquid is formed.
Hence adding heat will shift the equilbrium in the forward direction.

31 Year NEET Previous Year Questions: Equilibrium - 3 - Question 8

In which of the following the solubility of AgCl will be minimum ? [1993]

Detailed Solution for 31 Year NEET Previous Year Questions: Equilibrium - 3 - Question 8

In presence of the given salts, the solubility of AgCl decreases due to common ion effect.

31 Year NEET Previous Year Questions: Equilibrium - 3 - Question 9

Which of the following is most soluble ? [1994]

Detailed Solution for 31 Year NEET Previous Year Questions: Equilibrium - 3 - Question 9

For Bi2S3 .   Ksp– = (2s)2.(3s)3                              
= 4s2. 27s3 = 108s5

or     

For MnS. Ksp = s2

thus MnS has maximum solubility.

31 Year NEET Previous Year Questions: Equilibrium - 3 - Question 10

The pH value of a 10 M solution of HCl is [1995]

Detailed Solution for 31 Year NEET Previous Year Questions: Equilibrium - 3 - Question 10

Molarity (M) = 10M. HCl is a str ong acid and it is completely dissociated in aqueous solutions as :
So, for every moles of HCl, there is one H+.
Therefore [H+] = [HCl] or [H+] = 10. pH = – log[H+] = – log [10] = – 1.

31 Year NEET Previous Year Questions: Equilibrium - 3 - Question 11

The rate constant for forward and backward reaction of hydrolysis of ester are 1.1x10-2 and 1.5x10-3 per minute respectively. Equilibrium constant for the reaction [1995]
 

Detailed Solution for 31 Year NEET Previous Year Questions: Equilibrium - 3 - Question 11

Rate constant of forward reaction (Kf) = 1.1 × 10–2 and rate constant of backward reaction (Kb) = 1.5 × 10–3 per minute. Equilibrium constant  

31 Year NEET Previous Year Questions: Equilibrium - 3 - Question 12

Th e pH value of blood does not appreciably change by a small addition of an acid or a base, because the blood [1995]

Detailed Solution for 31 Year NEET Previous Year Questions: Equilibrium - 3 - Question 12

The buffer system present in serum is H2CO3 + NaHCO3 and as we known that a buffer solution resist the change in pH therefore pH value of blood does not change by a small addition of an acid or a base.

31 Year NEET Previous Year Questions: Equilibrium - 3 - Question 13

If α is the fraction of HI dissociated at equilibrium in the reaction, starting with 2 moles of HI, the total number of moles of reactants and products at equilibrium are[1996]

Detailed Solution for 31 Year NEET Previous Year Questions: Equilibrium - 3 - Question 13

According to equation

Total moles at equilibrium = 2 – 2α +α+α = 2 mole

31 Year NEET Previous Year Questions: Equilibrium - 3 - Question 14

The equilibrium con stant for the reaction A2  2A at 500 K and 700 K are 1 × 10–10 and 1× 10–5 respectively. The given reaction is[1996]

Detailed Solution for 31 Year NEET Previous Year Questions: Equilibrium - 3 - Question 14

Equilibrium constant is given by

Since the value given is very small, hence conc. of products is less. It means the reaction is slow.

31 Year NEET Previous Year Questions: Equilibrium - 3 - Question 15

The solubility products of CuS, Ag2S and HgS are 10–31, 10–44, 10–54 respectively. The solubilities of these sulphides are in the order

Detailed Solution for 31 Year NEET Previous Year Questions: Equilibrium - 3 - Question 15

For Binary salts like CuS & HgS, solubilty,

∴ The order is CuS > Ag2S > HgS

31 Year NEET Previous Year Questions: Equilibrium - 3 - Question 16

A physician wishes to prepare a buffer solution of pH = 3.58 that efficiently resists a change in pH yet contains only small concentrations of the buffering agents. Which one of the following weak acids together with its sodium salt would be the best to use ? [1997]

Detailed Solution for 31 Year NEET Previous Year Questions: Equilibrium - 3 - Question 16

For small concentration of buffering agent and for maximum buffer capacity

∴ pH = pKa

31 Year NEET Previous Year Questions: Equilibrium - 3 - Question 17

In a two-step exothermic reaction

Steps 1 and 2 are favoured respectively by [1997]

Detailed Solution for 31 Year NEET Previous Year Questions: Equilibrium - 3 - Question 17

since the steps 1 and 2 are exothermic hence low temprature will favour both the reactions.
In step - 1 moles are increasing hence low pressure will favour it. In step 2 moles are decreasing, hence high pressure will favour it.

31 Year NEET Previous Year Questions: Equilibrium - 3 - Question 18

If K1 and K2 are the respective equilibrium constants for the two reactions

the equilibrium constant of the reaction

will be[1998]

Detailed Solution for 31 Year NEET Previous Year Questions: Equilibrium - 3 - Question 18

For the reaction

and for the reaction

For reaction :

∴   From eq. no. (1) and (2)
K = K2/ K1

31 Year NEET Previous Year Questions: Equilibrium - 3 - Question 19

Among boron trifluoride, stannic chloride and stannous chloride, Lewis acid is represented by

Detailed Solution for 31 Year NEET Previous Year Questions: Equilibrium - 3 - Question 19

Lewis acid is that compound which have electron deficiency. eg. BF3, SnCl2.

31 Year NEET Previous Year Questions: Equilibrium - 3 - Question 20

What is the H+ ion concentration of a solution prepared by dissolving 4 g of NaOH (Atomic weight of Na = 23 amu) in 1000 ml? [1999]

Detailed Solution for 31 Year NEET Previous Year Questions: Equilibrium - 3 - Question 20

No. of moles of NaOH =  = 0.1

[Molecular weight of NaOH = 40]

No. of moles of OH = 0.

Concentration of OH = 0.1Mole /L

As we know that, [H+] [OH ] = 1014

31 Year NEET Previous Year Questions: Equilibrium - 3 - Question 21

The solubility product of a sparingly soluble salt BA2 is 4 × 10–12. The solubility of BA2 is[1999]

Detailed Solution for 31 Year NEET Previous Year Questions: Equilibrium - 3 - Question 21

Solubility product = [x]  [2x]2 = 4x3

∴   x = 10–4

31 Year NEET Previous Year Questions: Equilibrium - 3 - Question 22

A base when dissolved in water yields a solution with a hydroxyl ion concentration of 0.05 mol litre–1.The solution is [2000]

Detailed Solution for 31 Year NEET Previous Year Questions: Equilibrium - 3 - Question 22

Given : Hydroxyl ion concentration [OH] = 0.05 mol L–1. We know that the 

 We also know that

Since the value of pH > 7, therefore the solution is basic.

31 Year NEET Previous Year Questions: Equilibrium - 3 - Question 23

Value of KP in the reaction 

Detailed Solution for 31 Year NEET Previous Year Questions: Equilibrium - 3 - Question 23

MgCO3(s) → MgO(s) + CO2(g) MgO & MgCO3 are solid and they donot exert any pressure and hence only pressure exerted is by CO2. Therefore KP = PCO2

31 Year NEET Previous Year Questions: Equilibrium - 3 - Question 24

Conjugate acid of NH-2 is : [2000]

Detailed Solution for 31 Year NEET Previous Year Questions: Equilibrium - 3 - Question 24

Because NH3 after losing a proton (H+) gives NH2

(Conjugate acid-base pair differ only by a proton)

31 Year NEET Previous Year Questions: Equilibrium - 3 - Question 25

For dibasic acid correct order is [2000]

Detailed Solution for 31 Year NEET Previous Year Questions: Equilibrium - 3 - Question 25

In polyprotic acids the loss of second proton occurs much less readily than the first.
Usually the Ka values for successive loss of protons from these acids differ by at least a factor of 10–3 i.e.,  

31 Year NEET Previous Year Questions: Equilibrium - 3 - Question 26

Which of the following statements about pH and H+ ion concentration is incorrect? [2000]

Detailed Solution for 31 Year NEET Previous Year Questions: Equilibrium - 3 - Question 26

CH3COOH is weak acid while NaOH is strong base, so one equivalent of NaOH can not be neutralized with one equivalent of CH3COOH.
Hence the solution of one equivalent of each does not have pH value as 7. Its pH will be towards basic side as NaOH is a strong base hence conc. of OH will be more than the conc. of H+.

31 Year NEET Previous Year Questions: Equilibrium - 3 - Question 27

Solubility of a M2S salt is 3.5 × 10–6, then its solubility product will be [2001]

Detailed Solution for 31 Year NEET Previous Year Questions: Equilibrium - 3 - Question 27

Solubility product = (2x)2 (x) = 4x3 = 4 (3.5 × 10–6)3  = 1.7 × 10–16

31 Year NEET Previous Year Questions: Equilibrium - 3 - Question 28

Ionisation constant of CH3COOH is 1.7 × 10–5 if concentration of H+ ions is 3.4 × 10–4M, then find out initial concentration of CH3COOH molecules [2001]

Detailed Solution for 31 Year NEET Previous Year Questions: Equilibrium - 3 - Question 28

Given that,

CH3COOH is weak acid, so in it [CH3COOH] is equal to initial concentration. Hence

= 6.8 × 10–3M

31 Year NEET Previous Year Questions: Equilibrium - 3 - Question 29

In HS, I, RNH2 and NH3, order of proton accepting tendency will be [2001]

Detailed Solution for 31 Year NEET Previous Year Questions: Equilibrium - 3 - Question 29

Strong base has higher tendency to accept the proton. Increasing order of base and hence the order of accepting tendency of proton is I- < HS- < NH3 < RNH2

31 Year NEET Previous Year Questions: Equilibrium - 3 - Question 30

For the reaction

ΔH = +ve. In equilibrium condition, pressure of O2 is dependent on [2002]

Detailed Solution for 31 Year NEET Previous Year Questions: Equilibrium - 3 - Question 30

For the reaction

At equilibrium

[For solid and liquids concentration term is taken as unity]
Hence, the value of equilibrium constant depends only upon partial pressure of O2.
Further on increasing temperature formation of O2 increases as this is an endothermic reaction.

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