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Ionic Equilibrium — NEET UG Chemistry PYQs

764 previous year questions from Ionic Equilibrium with answers and solutions. Numbered list, year tags, and one-tap solutions — built for serious JEE / NEET practice.

764 questionsChemistrySolutions on every page
1

What amount of NaOH should be dissolved in a 500 mL solution, so that the p ^ H of solution is 12 at 298 K ?

MHT CET Medical 2026 Solution View → 2

Which of the following buffer solutions is used for precipitation of cations of the III A group?

MHT CET Medical 2026 Solution View → 3

The degree of dissociation of weak acid is directly proportional to

MHT CET Medical 2026 Solution View → 4

Which from the following is Lewis base?

MHT CET Medical 2026 Solution View → 5

The solubility of Fe(OH) ₃ is x mole per liter. Find its K_ sp .

MHT CET Medical 2026 Solution View → 6

The Basic buffer solution is made with 0.1 M NH ₄ OH and 0.2 M NH ₄ Cl . If K_b for the base is 1.8 10⁻⁵ , what is the pH of the buffer?

MHT CET Medical 2026 Solution View → 7

The hydrogen ion concentration of the ocean is about 2 10⁻⁹ M . What is the pOH of ocean?

MHT CET Medical 2026 Solution View → 8

Calculate the dissociation constant of a weak monobasic acid if it is 0.04% dissociated in a 0.01M solution.

MHT CET Medical 2026 Solution View → 9

Calculate the solubility of AgCl in mol/dm ^3 at 25 ^ C . Given: K_ sp ( AgCl ) = 1.8 10⁻¹⁰

MHT CET Medical 2026 Solution View → 10

A weak monobasic acid is 0.05 % dissociated in its solution, find the degree of dissociation.

MHT CET Medical 2026 Solution View → 11

Solubility of MA ₂ type of electrolyte is 0.5 10⁻⁴ mol/litre . Then find out k_ sp of electrolyte?

MHT CET Medical 2026 Solution View → 12

Which of the following aqueous solutions of salts is neutral?

MHT CET Medical 2026 Solution View → 13

Calculate the amount of NaOH in g/L in a one L solution of it with the pH of 12. (Molar mass of NaOH =40 g/mol)

MHT CET Medical 2026 Solution View → 14

The solubility of AgBr at 298 K is 2 10⁻⁷ kg/dm ^3 . Find the solubility product of AgBr at same temperature. [Molar mass of AgBr =188 g/mol]

MHT CET Medical 2026 Solution View → 15

Which of the following salts of weak acids and weak bases on hydrolysis turns red litmus blue? [ K_a for acetic acid = 1.8 10⁻⁵ , K_a for hydrofluoric acid = 6.8 10⁻⁴ , K_a for hyd

MHT CET Medical 2026 Solution View → 16

What is pH of HCl solution containing 0.365 g of HCl in 100 mL of solution, assuming complete dissociation at 298 K? ( Molar mass of HCl = 36.5 g/mol)

MHT CET Medical 2026 Solution View → 17

Which from the following is NOT a buffer solution?

MHT CET Medical 2026 Solution View → 18

Calculate the pH of the buffer solution consists of 0.005 M weak acid and 0.02 M of its salt with strong base BA. [ p K_a = 3.4437 ]

MHT CET Medical 2026 Solution View → 19

The solubility product of Ag ₂ CrO ₄ is 4 10⁻¹² . What is the amount of Ag ₂ CrO ₄ in gram present in 100 ml its saturated solution? (molar mass of Ag ₂ CrO ₄ = 331.73 g/mol).

MHT CET Medical 2026 Solution View → 20

The pH of HCl and H ₂ SO ₄ is same at same temperature. What is the ratio of molar concentration of HCl to H ₂ SO ₄ ?

MHT CET Medical 2026 Solution View → 21

Identify the strong electrolyte.

MHT CET Medical 2026 Solution View → 22

Calculate the solubility product of Ca(OH) ₂ if solubility of it is 3 mol dm ⁻³ at 25^ C .

MHT CET Medical 2026 Solution View → 23

Which of the following aqueous salt solutions is acidic?

MHT CET Medical 2026 Solution View → 24

What is the pH of buffer solution containing 10 times higher molar concentration of weak base than the molar concentration of salt of weak base with strong acid at 298 K? ( K_b of

MHT CET Medical 2026 Solution View → 25

Find the pH of 0.02 M HCl .

MHT CET Medical 2026 Solution View → 26

The solubility product of aluminium hydroxide at 298 K is 4.2 10⁻¹⁴ . Calculate its solubility in mol/L at same temperature.

MHT CET Medical 2026 Solution View → 27

Find the p K _b of the weak base BOH, if its K _b is 1 10⁻⁵ ?

MHT CET Medical 2026 Solution View → 28

Dissociation constant values for H ₂ CO ₃ , CH ₃ COOH , HCN, and HF are 4.3 10⁻⁷ , 1.8 10⁻⁵ , 4.0 10⁻¹⁰ and 7.2 10⁻⁴ respectively, at 25^ C . Identify the correct order of their in

MHT CET Medical 2026 Solution View → 29

If K_a of weak acid HA is 1 10⁻⁷ , calculate the [ H ₃ O ^+] of 0.1 M solution at equilibrium.

MHT CET Medical 2026 Solution View → 30

Calculate the pH of the resulting solution obtained by mixing 60 mL 0.1 M HCl and 40 mL 0.1 M NaOH.

MHT CET Medical 2026 Solution View → 31

In the washing of precipitates, the wash liquid should contain a common ion with the precipitate for

MHT CET Medical 2026 Solution View → 32

The degree of dissociation of a monobasic acid in its 0.1M solution at 300 K is 1.342 10⁻² . Calculate the degree of dissociation of the same acid in its 0.02M solution.

MHT CET Medical 2026 Solution View → 33

Calculate the percent dissociation of a weak mono-acidic base if its concentration is 0.02 M. [ K _b for weak mono-acidic base = 1.8 10⁻⁵ ]

MHT CET Medical 2026 Solution View → 34

Identify from following an example of Lewis acid.

MHT CET Medical 2026 Solution View → 35

In a qualitative analysis Bi ³⁺ is detected by appearance of precipitate of BiO(OH)(s) . Calculate pH when the following equilibrium exists at 298 K : BiO(OH)(s) BiO ⁺ (aq) + OH ⁻

NEET 2026 Solution View → 36

At 298 K, a certain buffer solution contains equal concentrations of X⁻ and HX , K_b for X⁻ is 10⁻¹⁰ . What is the pH of this buffer solution ?

NEET 2026 Solution View → 37

The correct order of solubility of the given salts in water at 298 K is Salt K_ sp at 298 K AgBr 5.0 10⁻¹³ Zn(OH)₂ 1.0 10⁻¹⁵ H g₂ Cl₂ 1.3 10⁻¹⁸

NEET 2026 Solution View → 38

Phenolphthalein is used as an indicator for the titration of sodium hydroxide solution against a standard solution of oxalic acid. The colour change that is observed at an alkaline

NEET 2026 Solution View → 39

Phosphoric acid ionizes in three steps with their ionization constant values K _ a ₁ , ~K _ a ₂ and K _ a ₃ , respectively, While K is the overall ionization constant. Which of the

NEET 2025 Solution View → 40

The ratio of solubility of AgCl in 0.1 M KCl solution to the solubility of AgCl in water is: (Given : Solubility product of AgCl =10⁻¹⁰ )

NEET 2024 Solution View → 41

Which indicator is used in the titration of sodium hydroxide against oxalic acid and what is the colour change at the end point?

NEET 2024 Solution View → 42

An acidic buffer is prepared by mixing:

NEET 2023 Solution View → 43

For a weak acid HA , the percentage of dissociation is nearly 1 % at equilibrium. If the concentration of acid is 0.1 ~mol ~L ⁻¹ , then the correct option for its K _ a at the same

NEET 2023 Solution View → 44

Amongst the given options which of the following molecules/ion acts as a Lewis acid?

NEET 2023 Solution View → 45

The pH of the solution containing 50   mL each of 0 . 10   M sodium acetate and 0 . 01   M acetic acid is [Given pK a of CH 3 COOH = 4 . 57 ]

NEET 2022 Solution View → 46

0.01 M acetic acid solution is 1 % ionised, then pH of this acetic acid solution is :

NEET 2022 Solution View → 47

The pK b of dimethylamine and pK a of acetic acid are 3 . 27 and 4 . 77 respectively at T ( K ) . The correct option for the pH of dimethylammonium acetate solution is:

NEET 2021 Solution View → 48

The solubility product for a salt of the type AB is 4 × 10 - 8 . What is the molarity of its saturated solution?

NEET 2020 Solution View → 49

HCl was passed through a solution of CaCl 2 , MgCl 2 and NaCl . Which of the following compound(s) crystallise(s)?

NEET 2020 Solution View → 50

Find out the solubility of Ni OH 2 in 0.1   M   NaOH . Given that the ionic product of Ni OH 2 is 2 × 10 – 15 .

NEET 2020 Solution View → 51

Which among the following salt solutions is basic in nature?

NEET 2020 Solution View → 52

Assertion : Some salts are sparingly soluble in water at room temperature. Reason : The entropy increases on dissolving the salts.

AIIMS 2019 Solution View → 53

Which of the following has maximum solubility at low pH ?

AIIMS 2019 Solution View → 54

If 50 ml of 0.1 HBr is mixed with 50 ml 0.2 M NaOH , find pH of resulting mixture

JIPMER 2019 Solution View → 55

The pH of 0.01 M NaOH (a q) solution will be

NEET 2019 Solution View → 56

Which of the following cannot act both as Bronsted acid and as Bronsted base?

NEET 2019 Solution View → 57

The molar solubility of CaF ₂ ( K _ sp =5.3 10⁻¹¹ ) in 0.1 M solution of NaF will be

NEET 2019 Solution View → 58

pH of a saturated solution of C a O H 2 is 9 . The solubility product K s p of C a O H 2 is:

NEET 2019 Solution View → 59

Calculate ionisation constant for pyridinium hydrogen chloride. (Given that H ⁺ ion concentration is 3.6 10⁻⁴ M and its concentration is 0.02 M .)

AIIMS 2018 Solution View → 60

When 50 ~mL of 0.1 M NH ₃ is mixed with 10 ~mL of 0.1 M HCl then what is the pH of resultant solution? ( p K_b=4.75 )

AIIMS 2018 Solution View → 61

Following solutions were prepared by mixing different volumes of NaOH and HCl of different concentrations. (i) 60   mL M 10   HCl + 40 mL M 10 NaOH (ii) 55   mL M 10

NEET 2018 Solution View → 62

The solubility of BaSO 4 in water is 2 .42 × 10 - 3   gL - 1 at 298   K . The value of its solubility product K sp will be (Given- the molar mass of BaSO 4 = 233 &#1

NEET 2018 Solution View → 63

Calculate the overall complex dissociation equilibrium constant for the [ Cu ( NH ₃ )₄ ]²⁺ ions, given that stability constant ( ₄ ) for this complex is 2.1 10¹³ .

AIIMS 2017 Solution View → 64

ZnO is white when cold and yellow when heated. It is due to the development of

AIIMS 2017 Solution View → 65

K_a for HCN is 5 10⁻¹⁰ at 25^ C . For maintaining a constant pH =9 , the volume of 5 M KCN solution required to be added to 10 ~mL of 2 M HCN solution is

AIIMS 2017 Solution View → 66

When 750 mL of 0.5 M HCl is mixed with 250 mL of 2 M NaOH solution, the value of pH will be

JIPMER 2017 Solution View → 67

Concentration of the Ag + ions in a saturated solution of Ag 2 C 2 O 4 is 2 .2 × 10 - 4   mol   L - 1 . Solubility product of Ag 2 C 2 O 4 is

NEET 2017 Solution View → 68

Assertion : H ₂ ~S is stronger acid than PH ₃ . Reason : S is more electronegative than P , conjugate base HS ⁻ is more stable than H ₂ P ⁻ .

AIIMS 2016 Solution View → 69

K_p for the reaction A B is 4 . If initially only A is present then what will be the partial pressure of B after equilibrium?

AIIMS 2016 Solution View → 70

100 mL of a solution contains 2 g of acetic acid and 3 g of sodium acetate providing K_a=1.8 10⁻⁵ , then choose the correct option.

JIPMER 2016 Solution View → 71

Aqueous solution of AlCl ₃ is acidic towards litmus while of NaCl is not. The correct reason behind this is

JIPMER 2016 Solution View → 72

The percentage of pyridine C 5 H 5 N that forms pyridinium ion C 5 H 5 N + H in a 0 . 10   M aqueous pyridine solution K b   for   C 5 H 5 N = 1 .7 × 10 - 9 is

NEET 2016 Solution View → 73

The solubility of A g C l s with solubility product 1.6 × 10 - 10 in 0.1 M N a C l solution would be

NEET 2016 Solution View → 74

MY and N Y 3 , two nearly insoluble salts, have the same K s p values of 6.2 × 10 - 13 at room temperature. Which statement would be true in regard to MY and N Y 3 ?

NEET 2016 Solution View → 75

The pair of amphoteric hydroxides is

AIIMS 2015 Solution View → 76

Assertion: Sb ₂ ~S ₃ is not soluble in yellow ammonium sulphide. Reason : The common ion effect due to S²⁻ ions reduces the solubility of Sb ₂ ~S ₃ .

AIIMS 2015 Solution View → 77

Which one of the following pairs of solution is not an acidic buffer?

NEET 2015 Solution View → 78

What is the pH of the resulting solution when equal volumes of 0.1 M NaOH and 0.01 M HCl are mixed?

NEET 2015 Solution View → 79

Assertion: Mixture of CH ₃ COOH and CH ₃ COONH ₄ is an example of acidic buffer. Reason: Acidic buffer contains equimolar mixture of weak acid and its salt with weak base.

AIIMS 2014 Solution View → 80

A buffer solution is prepared in which the concentration of NH ₃ is 0.30 M and the concentration of NH ₄⁺ is 0.20 M . If the equilibrium constant, K_b for NH ₃ equals 1.8 10⁻⁵ , wh

JIPMER 2014 Solution View → 81

Which of the following salts will give highest p H in water?

NEET 2014 Solution View → 82

What will be the solubility product of A X₃ ?

AIIMS 2013 Solution View → 83

p K_a of acetic acid and p K_b of ammonium hydroxide are 4.76 and 4.75 respectively. Calculate the pH of ammonium acetate solution.

JIPMER 2013 Solution View → 84

Accumulation of lactic acid ( HC ₃ H ₅ O ₃ ) , a monobasic acid in tissues leads to pain and a feeling of fatigue. In a 0.10 M aqueous solution, lactic acid is 3.7 % dissociates. T

NEET 2013 Solution View → 85

At 100^ C the K _w of water is 55 times its value at 25^ C . What will be the pH of neutral solution? ( 55=1.74)

NEET 2013 Solution View → 86

The dissociation constant of a weak acid is 1 10⁻⁴ . In order to prepare a buffer solution with a pH =5 , the [Salt]/ [Acid] ratio should be:

NEET 2013 Solution View → 87

Which of these is least likely to act as a Lewis base?

NEET 2013 Solution View → 88

Which has the highest pH ?

AIIMS 2012 Solution View → 89

The pH value of 0.001 M aqueous solution of NaCl is

JIPMER 2012 Solution View → 90

The solubility product of Hg ₂ I ₂ is equal to

JIPMER 2012 Solution View → 91

Which buffer solution comprising of the following has its pH value greater than 7 ?

JIPMER 2012 Solution View → 92

pH of a saturated solution of Ba ( OH )₂ is 12. The value of solubility product K_ sp of Ba ( OH )₂ is

NEET 2012 Solution View → 93

Equimolar solutions of the following substances were prepared separately. Which one of these will record the highest pH value?

NEET 2012 Solution View → 94

Buffer solutions have constant acidity and alkalinity because

NEET 2012 Solution View → 95

The compound which does not exist as hydrate form

AIIMS 2011 Solution View → 96

K_ s p of CaSO ₄ 5 H ₂ O is 9 10⁻⁶ , find the volume for 1 ~g of CaSO ₄ (M.wt. = 136).

AIIMS 2011 Solution View → 97

25 ~mL , 0.2 MCa ( OH )₂ is neutralised by 10 ~mL of 1 MHCl . Then pH of resulting solution is

AIIMS 2011 Solution View → 98

The expression for the solubility product of Ag ₂ CO ₃ will be

JIPMER 2011 Solution View → 99

10⁻⁶ M~ NaOH is diluted 100 times. The pH of the

JIPMER 2011 Solution View → 100

A buffer solution is prepared in which the concentration of NH ₃ is 0.30 M and the concentration of NH ₄⁺ is 0.20 M . If the equilibrium constant, K_b for NH ₃ equals 1.8 10⁻⁵ , wh

NEET 2011 Solution View → 101

Which of the following is least likely to behave as Lewis base?

NEET 2011 Solution View → 102

In qualitative analysis, the metals of group I can be separated from other ions by precipitating them as chloride salts. A solution initially contains Ag ⁺ and Pb ²⁺ at a concentra

NEET 2011 Solution View → 103

What is the pH of 0.01 M glycine solution? For glycine K_ a₁ =4.5 10⁻³ and K_ a₂ =1.7 10⁻¹⁰ at 298 ~K .

AIIMS 2010 Solution View → 104

The standard half-cell reduction potential for Ag ⁺ Ag is 0.7991 ~V at 25^ C . Given the experimental value K_ s p =1.56 10⁻¹⁰ for AgCl , calculate the standard half-cell reduction

AIIMS 2010 Solution View → 105

The solubility of saturated solution of Ag ₂ CrO ₄ is s mol L ⁻¹ . What is its solubility product?

JIPMER 2010 Solution View → 106

Which of the following is a Lewis acid?

JIPMER 2010 Solution View → 107

Which one of the following molecular hydrides acts as a Lewis acid ?

NEET 2010 Solution View → 108

pH of a 0.01 M solution (K_a=6.6 10⁻⁴ )

AIIMS 2009 Solution View → 109

Formula of microcosmic salt is

AIIMS 2009 Solution View → 110

Which of the following statement is correct?

JIPMER 2009 Solution View → 111

A 0.1 aqueous solution of a weak acid is 2 % ionised. If the ionic product of water is 1 10⁻¹⁴ , the [ OH ⁻ ] is

JIPMER 2009 Solution View → 112

The correct order of increasing ( [ H ₃ O ⁺ ] )in the following aqueous solutions is

AIIMS 2008 Solution View → 113

The pH of a 0.001 M solution of HCl is

JIPMER 2008 Solution View → 114

The ( pH ) of the solution obtained on neutralisation of (40 ~mL~ 0.1 ~M~ NaOH ) with (40 ~mL~ 0.1 ~M~ CH ₃ COOH ) is

AIIMS 2007 Solution View → 115

Assertion : Mixture of ( CH ₃ COOH ) and ( CH ₃ COONH ₄ ) is an example of acidic buffer. Reason : Acidic buffer contains equimolar mixture of weak acid and its salt with weak base

AIIMS 2007 Solution View → 116

During titration of acetic acid with aq. ( NaOH ) solution, the neutralisation graph has a vertical line. This line indicates

AIIMS 2007 Solution View → 117

At 25^ C , the dissociation constant of a base, BOH , is 1.0 10⁻¹² . The concentration of hydroxyl ions in 0.01 M aqueous solution of the base would be

JIPMER 2007 Solution View → 118

40 ~mL of 0.1 M ammonia solution is mixed with 20 ~mL of 0.1 MHCl . What is the pH of the mixture? ( p K_b of ammonia solution is 4.74)

AIIMS 2006 Solution View → 119

Assertion : Sb ₂ ~S ₃ is not soluble in yellow ammonium sulphide. Reason : The common ion effect due to S ²⁻ ions reduces the solubility of Sb ₂ ~S ₃ .

AIIMS 2006 Solution View → 120

Given pH of a solution A is 3 and it is mixed with another solution B having pH 2 . If both mixed, then resultant pH of the solution will be :

JIPMER 2006 Solution View →
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