# The value of $∆\mathrm{H}$ for the reaction is less than zero. Formation of ${X}_{2}\left(g\right)$ $+$ $4$ ${Y}_{2}\left(g\right)$ $⇋2X{Y}_{4}\left(g\right)$ will be favoured at: 1.  Low pressure and low temperature 2.  High temperature and low pressure 3.  High pressure and low temperature 4.  High temperature and high pressure

Subtopic:  Le Chatelier's principle |
75%
From NCERT
AIPMT - 2011
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In a buffer solution containing an equal concentration of B- and HB, the Kb for B- is 10-10. pH of the buffer solution is:

 1 10 2 7 3 6 4 4
Subtopic:  Buffer |
69%
From NCERT
AIPMT - 2010
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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 |
67%
From NCERT
AIPMT - 2007
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Which composition will make the 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 |
62%
From NCERT
NEET - 2019
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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 |
73%
From NCERT
NEET - 2019
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The solubility of BaSO4 in water is $2.42$ $×$ ${10}^{-3}$ g/ litre at 298 K. The value of the solubility product will be: (Molar mass of BaSO4 = 233 gmol–1)

 1 1.08 × 10–10 mol2 L–2 2 1.08 × 10–12 mol2 L–2 3 1.08 × 10–14 mol2 L–2 4 1.08 × 10–8 mol2 L–2
Subtopic:  Solubility Product |
61%
From NCERT
NEET - 2018
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A Lewis base among the following is:

 1 BF3 2 PF3 3 CF4 4 SiF4
Subtopic:  Acids & Bases - Definitions & Classification |
65%
From NCERT
NEET - 2016
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The concentration of $\left[{\mathrm{H}}^{+}\right]$ ion in a solution containing 0.1 M HCN and 0.2 M NaCN will be:

(${\mathrm{K}}_{\mathrm{a}}$ for HCN = $6.2×{10}^{-10}$)

1. 3.1$×{10}^{10}$

2. $6.2×{10}^{5}$

3. $6.2×{10}^{-10}$

4. $3.1×{10}^{-10}$

Subtopic:  Buffer |
67%
From NCERT
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The addition of HCl does not suppress the ionization of:

 1 Acetic acid 2 Benzoic acid 3 H2S 4 H2SO4
Subtopic:  Common Ion Effect |
60%
From NCERT
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