Acid Base Concepts

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JEE Advanced 2025

LEVELJEE Advanced

At $2 5^{\circ} C$ , the concentration of $H^{+}$ ions in $1.00 \times 1 0^{- 3} M$ aqueous solution of a weak monobasic acid having acid dissociation constant $(K_{a}) = 4.00 \times 1 0^{- 11}$ is $X \times 1 0^{- 7} M$ . The value of $X$ is _______. Use: Ionic product of water $(K_{w}) = 1.00 \times 1 0^{- 14}$ at $2 5^{\circ} C$

JEE Main 2020

LEVELJEE Main

If you spill a chemical toilet cleaning liquid on your hand, your first aid would be

NaOH

(C)

aqueous

NaHCO_{3}

(D)

aqueous

NH_{3}

LEVELJEE Main

Four species are listed below I. $HCO_{3}^{-}$ II. $H_{3} O^{+}$ III. $HSO_{4}^{-}$ IV. $HSO_{3} F$ Which one of the following is the correct sequence of their acid strength?

The conjugate base of $H_{2} PO_{4}^{-}$ is

(A)

PO_{4}^{3 -}

(B)

P_{2} O_{5}

(C)

H_{3} PO_{4}

(D)

HPO_{4}^{2 -}

JEE Main 2019

LEVELJEE Main

The decreasing order of electrical conductivity of the following aqueous solution is 0.1 M formic acid (A), 0.1 M acetic acid (B), 0.1 M benzoic acid (C).

In aqueous solution, the ionisation constants for carbonic acid are $K_{1} = 4.2 \times 1 0^{- 7}$ and $K_{2} = 4.8 \times 1 0^{- 11}$ . Select the correct statement for a saturated $0.034 M$ solution of the carbonic acid.

(A)

The concentration of

CO_{3}^{2 -}

0.034 M

(B)

The concentration of

CO_{3}^{2 -}

is greater than that of

HCO_{3}^{-}

(C)

The concentration of

H^{+}

and

HCO_{3}^{-}

are approximately equal

(D)

The concentration of

H^{+}

is double that of

CO_{3}^{2 -}

LEVELJEE Main

Which one of the following species acts as both Bronsted acid and base?

(A)

H_{2} P O_{2}^{-}

(B)

H P O_{3}^{2 -}

(C)

H P O_{4}^{2 -}

(D)

All of these

LEVELBoard

What is the conjugate base of $OH^{-}$ ?

(A)

O^{2 -}

(B)

O^{-}

(C)

H_{2} O

(D)

O_{2}

LEVELJEE Main

An acid HA ionises as $H A ⇌ H^{+} + A^{-}$ . The pH of 1.0 M solution is 5. Its dissociation constant would be

(A)

1 \times 1 0^{- 10}

(B)

(C)

5 \times 1 0^{- 8}

(D)

1 \times 1 0^{- 5}

JEE Main 2003

LEVELJEE Main

Which one of the following substances has the highest proton affinity ?

(A)

H_{2} O

(B)

H_{2} S

(C)

N H_{3}

(D)

P H_{3}

JEE Main 2021

LEVELJEE Main

Assuming that $Ba(OH)_{2}$ is completely ionised in aqueous solution under the given conditions the concentration of $H_{3} O^{+}$ ions in $0.005 M$ aqueous solution of $Ba(OH)_{2}$ at $298 K$ is ...... $\times 1 0^{- 12} mol L^{- 1}$ . (Nearest integer)

LEVELJEE Main

Three reactions involving $H_{2} PO_{4}^{-}$ are given below I. $H_{3} PO_{4} + H_{2} O ⟶ H_{3} O^{+} + H_{2} PO_{4}^{-}$ II. $H_{2} PO_{4}^{-} + H_{2} O ⟶ HPO_{4}^{2 -} + H_{3} O^{+}$ III. $H_{2} PO_{4}^{-} + OH^{-} ⟶ H_{3} PO_{4} + O^{2 -}$ In which of the above does $H_{2} PO_{4}^{-}$ act as an acid?

Which of the following are Lewis acids?

(A)

PH_{3}

and

BCl_{3}

(B)

AlCl_{3}

and

SiCl_{4}

(C)

PH_{3}

and

SiCl_{4}

(D)

BCl_{3}

and

AlCl_{3}

JEE Main 2021

LEVELJEE Main

0.01 moles of a weak acid $HA (K_{a} = 2.0 \times 1 0^{- 6})$ is dissolved in $1.0 L$ of $0.1 M HCl$ solution. The degree of dissociation of HA is $\dots \times 1 0^{- 5}$ (Round off to the nearest integer). [Neglect volume change on adding HA. Assume degree of dissociation $≪ 1$ ]

If you spill a chemical toilet cleaning liquid on your hand, your first aid would be

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } Four species are listed below I. HCO3−​ II. H3​O+ III. HSO4−​ IV. HSO3​F Which one of the following is the correct sequence of their acid strength?

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } The conjugate base of H2​PO4−​ is

The decreasing order of electrical conductivity of the following aqueous solution is 0.1 M formic acid (A), 0.1 M acetic acid (B), 0.1 M benzoic acid (C).

Which one of the following species acts as both Bronsted acid and base?

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } What is the conjugate base of OH−?

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } An acid HA ionises as HA⇌H++A−. The pH of 1.0 M solution is 5. Its dissociation constant would be

Which one of the following substances has the highest proton affinity ?

Which of the following are Lewis acids?

Four species are listed below I. $HCO_{3}^{-}$ II. $H_{3} O^{+}$ III. $HSO_{4}^{-}$ IV. $HSO_{3} F$ Which one of the following is the correct sequence of their acid strength?

The conjugate base of $H_{2} PO_{4}^{-}$ is

What is the conjugate base of $OH^{-}$ ?

An acid HA ionises as $H A ⇌ H^{+} + A^{-}$ . The pH of 1.0 M solution is 5. Its dissociation constant would be