# pH of a saturated solution of $\mathrm{Ca}{\left(\mathrm{OH}\right)}_{2}$ is 9. The solubility product $\left({\mathrm{K}}_{\mathrm{sp}}\right)$ of $\mathrm{Ca}{\left(\mathrm{OH}\right)}_{2}$ is: 1. $0.5×{10}^{-10}$ 2. $0.5×{10}^{-15}$ 3. $0.25×{10}^{-10}$ 4. $0.125×{10}^{-15}$

Subtopic:  pH calculation |
66%
From NCERT
NEET - 2019
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The conjugate bases of Bronsted acids H2O and HF are respectively:

1. H3O+ and H2F+, respectively.

2. OH- and H2F+, respectively.

3. H3O+ and F-, respectively.

4. OH- and F-, respectively.

Subtopic:  Acids & Bases - Definitions & Classification |
71%
From NCERT
NEET - 2019
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Which will make basic buffer:

 1 100 mL of 0.1 M HCl+100 mL of 0.1 M NaOH 2 50 mL of 0.1 M NaOH+25 mL of 0.1 M CH3COOH 3 100 mL of 0.1 M CH3COOH+100 mL of 0.1 M NaOH 4 100 mL of 0.1 M HCl+200 mL of 0.1 M NH4OH
Subtopic:  Buffer |
58%
From NCERT
NEET - 2019
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The hydrogen ion concentration of a 10-8 M HCl aqueous solution at 298 K (Kw = 10-14) is:

1. $1.0×{10}^{-6}$ $M$

2. $1.0525×{10}^{-7}$ $M$

3. $9.525×{10}^{-8}$ $M$

4. $1.0×{10}^{-8}$ $M$

Subtopic:  pH calculation |
50%
From NCERT
AIPMT - 2006
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The following pair constitutes a buffer is:

1. $HN{O}_{2}$ $and$ $NaN{O}_{2}$

2. $NaOH$ $and$ $NaCl$

3. $HN{O}_{3}$ $and$ $N{H}_{4}N{O}_{3}$

4. $HCl$ $and$ $KCl$

Subtopic:  Buffer |
65%
From NCERT
AIPMT - 2006
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For the reaction,
CH4(g) + 2O2(gCO2(g) + 2H2O(l
ΔrH = -170.8 kJ mol-1
Which of the following statements is not true?

 1 At equilibrium, the concentration of $$\mathrm{CO}_2 \mathrm{~g}$$ and water (l) are not equal. 2 The equilibrium constant for the reaction is given by $$K_p=\frac{\left[\mathrm{CO}_2\right]}{\left[\mathrm{CH}_4\right]\left[\mathrm{O}_2\right]}$$ 3 The addition of  $$\mathrm{CH}_4 \mathrm{~g}$$ or $$\mathrm{O}_2 \mathrm{~g}$$  at equilibrium will cause a shift to the right 4 The reaction is exothermic

Subtopic:  Kp, Kc & Factors Affecting them |
65%
From NCERT
AIPMT - 2006
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Which one of the following orders correctly represents the increasing acid strengths of the given acids?

1. $HOCl

2. $HOClO

3. $HOCl{O}_{2}

4. $HOCl{O}_{3}

Subtopic:  Acids & Bases - Definitions & Classification |
87%
From NCERT
AIPMT - 2007
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The ionic species that has the greatest proton affinity to form stable compound is:

1. $H{S}^{-}$

2. $N{H}_{2}^{-}$

3. ${F}^{-}$

4. ${l}^{-}$

Subtopic:  Acids & Bases - Definitions & Classification |
From NCERT
AIPMT - 2007
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The following equilibrium constants are given:
N2 + 3H2 ⇌ 2NH3K1
N2 + O⇌ 2NO; K2
H2 + 1/2O2 ⇌ H2O; K3

The equilibrium constant for the oxidation of NH3 by oxygen to give NO is:

1. ${K}_{2}{K}_{3}^{3}/{K}_{1}$

2. ${K}_{2}{K}_{3}^{2}/{K}_{1}$

3. ${K}_{2}^{2}{K}_{3}/{K}_{1}$

4. ${K}_{1}{K}_{2}/{K}_{3}$

Subtopic:  Kp, Kc & Factors Affecting them |
66%
From NCERT
AIPMT - 2007
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A weak acid, HA, has a Ka of 1.00×10-5. If 0.100 mole of this acid is dissolved in one litre of water, the percentage of acid dissociated at equilibrium is closest to:

1. 99.0%

2. 1%

3. 99.9%

4. 0.100%

Subtopic:  Salt Hydrolysis & Titration |
65%
From NCERT
AIPMT - 2007
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