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Q. No.For the reaction \(A(g) \rightleftharpoons 2B(g),\) the backward reaction rate constant is higher than the forward reaction
rate constant by a factor of \(2500,\) at \(1000~K \)
[ Given: \({R= 0.0831~ L ~\text{atm mol}^{-1} }K^{-1}]\)
\(K_p\) for the reaction at \(1000~ K\) is
1. \(0.033 \)
2. \(0.021 \)
3. \(83.1 \)
4. \(2 .077 \times 10^5\)
rate constant by a factor of \(2500,\) at \(1000~K \)
[ Given: \({R= 0.0831~ L ~\text{atm mol}^{-1} }K^{-1}]\)
\(K_p\) for the reaction at \(1000~ K\) is
1. \(0.033 \)
2. \(0.021 \)
3. \(83.1 \)
4. \(2 .077 \times 10^5\)
Subtopic: Kp, Kc & Factors Affecting them |
From NCERT
NEET - 2025
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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?
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
| 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. | \(\mathrm{K}_{\mathrm{a}_1}=\frac{\mathrm{K}_{\mathrm{a}_3}+\mathrm{K}_{\mathrm{a}_2}}{2}\) |
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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Higher yield of \(\mathrm{NO}\) in \(\mathrm{N}_2(\mathrm{~g})+\mathrm{O}_2(\mathrm{~g}) \rightleftharpoons 2 \mathrm{NO}(\mathrm{g})\) can be obtained at
\([ \Delta \mathrm{H}\) of the reaction \(=+180.7 \mathrm{~kJ} \mathrm{~mol}^{-1} ]\)
A. higher temperature
B. lower temperature
C. higher concentration of \(\mathrm{N}_2\)
D. higher concentration of \(\mathrm{O}_2\)
Choose the correct answer from the options given below:
1. B, C, D only
2. A, C, D only
3. A, D only
4. B, C only
\([ \Delta \mathrm{H}\) of the reaction \(=+180.7 \mathrm{~kJ} \mathrm{~mol}^{-1} ]\)
A. higher temperature
B. lower temperature
C. higher concentration of \(\mathrm{N}_2\)
D. higher concentration of \(\mathrm{O}_2\)
Choose the correct answer from the options given below:
1. B, C, D only
2. A, C, D only
3. A, D only
4. B, C only
Subtopic: Le Chatelier's principle |
73%
From NCERT
NEET - 2025
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For the reaction \(2 \mathrm{~A} \rightleftharpoons \mathrm{B}+\mathrm{C}, \mathrm{K}_{\mathrm{c}}=4 \times 10^{-3}\) . At a given time, the composition of reaction mixture is : \([\mathrm{A}]=[\mathrm{B}]=[\mathrm{C}]=2 \times 10^{-3} \mathrm{M} \text {. }\)
In light of the above facts, which of the following is correct?
In light of the above facts, which of the following is correct?
| 1. | Reaction has a tendency to go in the forward direction. |
| 2. | Reaction has a tendency to go in the backward direction. |
| 3. | Reaction has gone to completion in the forward direction. |
| 4. | Reaction is at an equilibrium. |
Subtopic: Kp, Kc & Factors Affecting them | Le Chatelier's principle |
59%
From NCERT
NEET - 2024
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In which of the following equilibria, \(\text{K}_\text{p}\) and \(\text{K}_\text{c}\) are NOT equal?
1. \(\mathrm{H}_{2(\mathrm{~g})}+\mathrm{I}_{2(\mathrm{~g})} \rightleftharpoons 2 \mathrm{HI}_{(\mathrm{g})}\)
2. \(\mathrm{CO}_{(\mathrm{g})}+\mathrm{H}_2 \mathrm{O}_{(\mathrm{g})} \rightleftharpoons \mathrm{CO}_{2(\mathrm{~g})}+\mathrm{H}_{2(\mathrm{~g})}\)
3. \(2 \mathrm{BrCl}_{(\mathrm{g})} \rightleftharpoons \mathrm{Br}_{2(\mathrm{~g})}+\mathrm{Cl}_{2(\mathrm{~g})}\)
4. \(\mathrm{PCl}_{5(\mathrm{~g})} \rightleftharpoons \mathrm{PCl}_{3(\mathrm{~g})}+\mathrm{Cl}_{2(\mathrm{~g})}\)
1. \(\mathrm{H}_{2(\mathrm{~g})}+\mathrm{I}_{2(\mathrm{~g})} \rightleftharpoons 2 \mathrm{HI}_{(\mathrm{g})}\)
2. \(\mathrm{CO}_{(\mathrm{g})}+\mathrm{H}_2 \mathrm{O}_{(\mathrm{g})} \rightleftharpoons \mathrm{CO}_{2(\mathrm{~g})}+\mathrm{H}_{2(\mathrm{~g})}\)
3. \(2 \mathrm{BrCl}_{(\mathrm{g})} \rightleftharpoons \mathrm{Br}_{2(\mathrm{~g})}+\mathrm{Cl}_{2(\mathrm{~g})}\)
4. \(\mathrm{PCl}_{5(\mathrm{~g})} \rightleftharpoons \mathrm{PCl}_{3(\mathrm{~g})}+\mathrm{Cl}_{2(\mathrm{~g})}\)
Subtopic: Kp, Kc & Factors Affecting them |
80%
From NCERT
NEET - 2024
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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
\(\text{NO}=2.8 \times 10^{-3}\)
\(2 \text{NO}_{(\text{g})} \rightleftharpoons \text{N}_{2(\text{g})} +\text{O}_{2\text{(g)}}\)
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
\(\text{N}_2=3.0 \times 10^{-3} \text{M}, \text{O}_2=4.2 \times 10^{-3} \text{M}\) and
\(\text{NO}=2.8 \times 10^{-3}\)
\(2 \text{NO}_{(\text{g})} \rightleftharpoons \text{N}_{2(\text{g})} +\text{O}_{2\text{(g)}}\)
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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Consider the reaction in equilibrium
\(\mathrm{PCl}_5=\mathrm{PCl}_3+\mathrm{Cl}_2\)
at \(500 \mathrm{~K} .\) The concentration of \(\mathrm{PCl}_5=1.40~ \mathrm{M} \text {, }\) concentration of \(\mathrm{Cl}_2=1.60~ \mathrm{M} \text {, }\) concentration of \(\mathrm{PCl}_3=1.60 \mathrm{M}\). Calculate \(K_c\):
1. 2.00
2. 2.6
3. 1.83
4. 3.4
\(\mathrm{PCl}_5=\mathrm{PCl}_3+\mathrm{Cl}_2\)
at \(500 \mathrm{~K} .\) The concentration of \(\mathrm{PCl}_5=1.40~ \mathrm{M} \text {, }\) concentration of \(\mathrm{Cl}_2=1.60~ \mathrm{M} \text {, }\) concentration of \(\mathrm{PCl}_3=1.60 \mathrm{M}\). Calculate \(K_c\):
1. 2.00
2. 2.6
3. 1.83
4. 3.4
Subtopic: Kp, Kc & Factors Affecting them |
89%
From NCERT
NEET - 2024
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For the equilibrium
\(\mathrm{2NOCl_\text{(g)}\rightleftharpoons2NO_{\text{(g)}}+Cl_{2{\text{(g)}}}}\)
the value of the equilibrium constant is \(3.0\times10^{-6} \) at \(1000~K.\) Find \(K_p\) for the reaction at this temperature (Given \(R:8.314~\text{J K}^{-1}\text{mol}^{-1}\)):
\(\mathrm{2NOCl_\text{(g)}\rightleftharpoons2NO_{\text{(g)}}+Cl_{2{\text{(g)}}}}\)
the value of the equilibrium constant is \(3.0\times10^{-6} \) at \(1000~K.\) Find \(K_p\) for the reaction at this temperature (Given \(R:8.314~\text{J K}^{-1}\text{mol}^{-1}\)):
| 1. | \(1.493\) | 2. | \(2.494\times10^{-2}\) |
| 3. | \(3.0\times10^{-6}\) | 4. | \(2.494\times10^{-4}\) |
Subtopic: Kp, Kc & Factors Affecting them |
78%
From NCERT
NEET - 2024
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At a given temperature and pressure, the equilibrium constant value for the equilibria are given below:
\(3A_2+B_2\rightleftharpoons 2A_3B, K_1\\ A_3B \rightleftharpoons \frac 3{2}A_2+\frac 1{2}B_2, K_2 \)
The relation between \(K_1\) and \(K_2\) is:
1. \(K^2_1=2K_2\)
2. \(K_2= \frac { K_1 }{2}\)
3. \(K_1=\frac 1{\sqrt K_2}\)
4. \(K_2=\frac 1{\sqrt K_1}\)
\(3A_2+B_2\rightleftharpoons 2A_3B, K_1\\ A_3B \rightleftharpoons \frac 3{2}A_2+\frac 1{2}B_2, K_2 \)
The relation between \(K_1\) and \(K_2\) is:
1. \(K^2_1=2K_2\)
2. \(K_2= \frac { K_1 }{2}\)
3. \(K_1=\frac 1{\sqrt K_2}\)
4. \(K_2=\frac 1{\sqrt K_1}\)
Subtopic: Introduction To Equilibrium |
70%
From NCERT
NEET - 2024
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For the reaction in equilibrium
\(\mathrm{N_2(g) +3H_2(g) \rightleftharpoons 2NH_3(g), \Delta H=-Q}\)
Reaction is favoured in forward direction by:
\(\mathrm{N_2(g) +3H_2(g) \rightleftharpoons 2NH_3(g), \Delta H=-Q}\)
Reaction is favoured in forward direction by:
| 1. | Use of catalyst |
| 2. | Decreasing concentration of \(\mathrm{N_2}\) |
| 3. | Low pressure, high temperature and high concentration of ammonia |
| 4. | High pressure, low temperature and higher concentration of \(\mathrm{H_2}\) |
Subtopic: Le Chatelier's principle |
81%
From NCERT
NEET - 2024
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