Phosphoric acid ionizes in three steps, with their ionization constant values \(\mathrm{K}_{\mathrm{a}_1}, \mathrm{~K}_{\mathrm{a}_2} \text { and } \mathrm{K}_{\mathrm{a}_3} \text {, }\)respectively, while \(K\) is the overall ionization constant.  Which of the following statements are true?
A. \(\log \mathrm{K}=\log \mathrm{K}_{\mathrm{a}_1}+\log \mathrm{K}_{\mathrm{a}_2}+\log \mathrm{K}_{\mathrm{a}_3}\)
B.  \(\mathrm{H}_3 \mathrm{PO}_4\) is a stronger acid than \(\mathrm{H}_2 \mathrm{PO}_4^{-}\) and \(\mathrm{HPO}_4^{2-} .\)
C. \(\mathrm{K}_{a_1} >\mathrm{~K}_{\mathrm{a}_2}>\mathrm{K}_{\mathrm{a}_3} \)
D. \(\mathrm{K}_{\mathrm{a}_1}=\frac{\mathrm{K}_{\mathrm{a}_3}+\mathrm{K}_{\mathrm{a}_2}}{2}\)
Choose the correct answer from the options given below : 
1. B, C and D only 
2. A, B and C only 
3. A and B only 
4. A and C only
Subtopic:  Ionisation Constant of Acid, Base & Salt |
 55%
From NCERT
NEET - 2025
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Consider the following reaction in a sealed vessel at equilibrium with concentrations of
\(\text{N}_2=3.0 \times 10^{-3} \text{M}, \text{O}_2=4.2 \times 10^{-3} \text{M}\) and
\(\text{NO}=2.8 \times 10^{-3} \text M\)
\(2 \text{NO}_{(\text{g})} \rightleftharpoons \text{N}_{2(\text{g})} +\text{O}_{2\text{(g)}}\)

If 0.1 mol L-1 of NO(g) is taken in a closed vessel, what will be the degree of dissociation (\(\alpha\)) of NO(g) at equilibrium?

1. 0.0889
2. 0.8889
3. 0.717
4. 0.00889
Subtopic:  Ionisation Constant of Acid, Base & Salt |
From NCERT
NEET - 2024
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NEET 2026 - Target Batch - Vital
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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 Ka at the same temperature will be:
1. \(1 \times 10^{-4}\)    
2. \(1 \times 10^{-6} \)
3. \(1 \times 10^{-5} \)
4. \(1 \times 10^{-3} \)
Subtopic:  Ionisation Constant of Acid, Base & Salt |
 68%
From NCERT
NEET - 2023
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Aqueous solution of which of the following compounds is the best conductor of electric current?
1. Acetic acid, \(\mathrm{C_{2} H_{4} O_{2}}\)
2. Hydrochloric acid, \(\mathrm{HCl}\)
3. Ammonia, \(\mathrm{N H_{3}}\)
4. Fructose, \(\mathrm{C_{6} H_{12} O_{6}}\)
 

Subtopic:  Ionisation Constant of Acid, Base & Salt |
 86%
From NCERT
NEET - 2015
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The strongest acid among the following compounds is:

1. HClO3 2. HClO4
3. H2SO3 4. H2SO4
Subtopic:  Ionisation Constant of Acid, Base & Salt |
 74%
From NCERT
AIPMT - 2013
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At 25 ºC, the dissociation constant of a base, BOH, is 1.0 × 10–12. The concentration of hydroxyl ions in 0.01M aqueous solution of the base would be:

1. 1.0 × 10–6 mole L–1 2. 1.0 × 10–7 mole L–1
3. 2.0 × 10–6 mole L–1 4. 1.0 × 10–5 mole L–1
Subtopic:  Ionisation Constant of Acid, Base & Salt |
 74%
From NCERT
AIPMT - 2005
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NEET 2026 - Target Batch - Vital
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