An incorrect statement about equilibrium among the following is:

1. Equilibrium is possible only in a closed system at a given temperature.
2. All measurable properties of the system remain constant.
3. All the physical processes stop at equilibrium.
4. The opposing processes occur at the same rate and there is a dynamic but stable condition.

Subtopic:  Introduction To Equilibrium |
 73%
From NCERT
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PCl5, PCl3, and Cl2 are at equilibrium at 500 K in a closed container and their concentrations are 0.8×10-3 mol L-1 , 1.2×10-3 mol L-1 and 1.2×10-3 mol L-1, respectively.
The value of  Kc  for the reaction PCl5(g) ⇌ PCl3(g) + Cl2(g) will be:

1. 1.8 × 103 mol L-1 2. 1.8 × 103
3. 1.8 × 10-3 mol L-1 4. 0 . 55 × 104

Subtopic:  Kp, Kc & Factors Affecting them |
 87%
From NCERT
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An incorrect statement about equilibrium among the following is:

1. In equilibrium mixture of ice and water kept in perfectly insulated flask, the mass of ice and water does not change with time.
2. The intensity of the red colour increases when oxalic acid is added to a solution containing iron (III) nitrate and potassium thiocyanate.
3. On the addition of a catalyst, the equilibrium constant value is not affected.
4. The equilibrium constant for a reaction with a negative  ∆H  value decreases as the temperature increases.
 
Subtopic:  Introduction To Equilibrium |
 53%
From NCERT
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When hydrochloric acid is added to cobalt nitrate solution at room temperature, the following reaction takes place and the reaction mixture becomes blue. On cooling the mixture it becomes pink
\(\small{\left[\mathrm{Co}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{3+}(\text {Pink})\left(\mathrm{aq})+4 \mathrm{Cl}^{-}(\mathrm{aq}) \rightleftharpoons\left[\mathrm{CoCl}_4\right]^{2-}(\text {Blue})(\mathrm{aq})+6 \mathrm{H}_2 \mathrm{O}(\mathrm{l})\right.}\)

On the basis of the information given above, mark the correct answer:

1. ∆ H > 0  for the reaction
2. ∆ H < 0  for the reaction
3. ∆ H = 0  for the reaction
4. The sign of  ∆ H  cannot be predicted on the basis of the given information.
Subtopic:  Le Chatelier's principle |
 58%
From NCERT
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The pH of neutral water at 25°C is 7.0. As the temperature increases, ionisation of water increases. However, the concentration of H+ ions and OH- ions is equal. The pH of pure water at 60°C is:

1. Equal to 7.0 2. Greater than 7.0
3. Less than 7.0 4. Equal to zero
Subtopic:  pH calculation |
 63%
From NCERT
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The ionisation constant of an acid, Ka , is the measure of the strength of an acid. The Ka values of acetic acid, hypochlorous acid and formic acid are 1.74×10-5, 3.0×10-8 and 1.8×10-4 , respectively. The  correct order of pH value of 0.1 mol dm-3 solutions of these acids is -

1. Acetic acid > hypochlorous acid > formic acid

2. Hypochlorous acid < acetic acid > formic acid

3. Formic acid > hypochlorous acid > acetic acid

4. Formic acid < acetic acid < hypochlorous acid

Subtopic:  pH calculation |
 65%
From NCERT
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Ka1, Ka2 and Ka3 are the respective ionisation constants for the following reactions.
\(\mathrm{H}_2 \mathrm{~S} \rightleftharpoons \mathrm{H}^{+}+\mathrm{HS}^{-}\)
\(\mathrm{HS}^{-} \rightleftharpoons \mathrm{H}^{+}+\mathrm{S}^{2-}\)
\(\mathrm{H}_2 \mathrm{~S} \rightleftharpoons 2 \mathrm{H}^{+}+\mathrm{S}^{2-}\)
The correct relationship between Ka1, Ka2 and Ka3 is:

1. \(\mathrm{K}_{\mathrm{a}_3}=\mathrm{K}_{\mathrm{a}_1} \times \mathrm{K}_{\mathrm{a}_2} \) 2. \(\mathrm{K}_{\mathrm{a}_3}=\mathrm{K}_{\mathrm{a}_1}+\mathrm{K}_{\mathrm{a}_2} \)
3. \(K_{a_3}=K_{a_1}-K_{a_2} \) 4. \(\mathrm{K}_{\mathrm{a}_3}=\mathrm{K}_{\mathrm{a}_1} / \mathrm{K}_{\mathrm{a}_2}\)
Subtopic:  Introduction To Equilibrium |
 80%
From NCERT
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Acidity of BF3 can be explained on the basis of: 

1. Arrhenius concept

2. Bronsted Lowry concept 

3. Lewis concept

4. Bronsted Lowry as well as Lewis concept

Subtopic:  Acids & Bases - Definitions & Classification |
 78%
From NCERT
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The mixture that will produce a buffer solution when mixed in equal volumes is:

1. 0.1 mol dm-3 NH4OH and 0.1 mol dm-3 HCl
2. 0.05 mol dm-3 NH4OH and 0.1 mol dm-3 HCl
3. 0.1 mol dm-3 NH4OH and 0.05 mol dm-3 HCl
4. 0.1 mol dm-3 CH3COONa and 0.1 mol dm-3 NaOH

Subtopic:  Buffer |
 59%
From NCERT
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Among the following solvents, silver chloride is most soluble in:

1. 0.1 mol dm-3 AgNO3 solution

2. 0.1 mol dm-3 HCl solution

3. H2O

4. Aqueous ammonia

Subtopic:  Common Ion Effect |
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