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 : $$[\mathrm{A}]=[\mathrm{B}]=[\mathrm{G}]=2 \times 10^{-3} \mathrm{M} \text {. }$$
Then, which of the following is correct?
1. Reaction has a tendency to go in forward direction.
2. Reaction has a tendency to go in backward direction.
3. Reaction has gone to completion in forward direction.
4. Reaction is at equilibrium.
Subtopic:  Introduction To Equilibrium |
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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. $$\mathrm{PCl}_{5(\mathrm{~g})} \rightleftharpoons \mathrm{PCl}_{3(\mathrm{~g})}+\mathrm{Cl}_{2(\mathrm{~g})}$$
Subtopic:  Kp, Kc & Factors Affecting them |
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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 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
Subtopic:  Kp, Kc & Factors Affecting them |
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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 $$R:8.314~\text{J K}^{-1}\text{mol}^{-1}$$)
1. $$1.493$$
2. $$2.494\times10^{-2}$$
3. $$3.0\times10^{-6}$$
4. $$2.494\times10^{-4}$$
Subtopic:  Kp, Kc & Factors Affecting them |
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From NCERT
NEET - 2024
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Amongst the given option which of the following molecules/ion acts as a Lewis acid?
 1 $$\text{OH}^-$$ 2 $$\text{NH}_3$$ 3 $$\text H_2 \text O$$ 4 $$\text{BF}_3$$
Subtopic:  Acids & Bases - Definitions & Classification |
72%
From NCERT
NEET - 2023
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The equilibrium concentration of the species in the reaction $$A+B \rightleftharpoons C+D$$ are 2, 3, 10 and 6 mol L–1, respectively at 300 K. $$\Delta G^o$$ for the reaction is: (R = 2 cal/mol K)
 1 –13.73 cal 2 1372.60 cal 3 –137.26 cal 4 –1381.80 cal
Subtopic:  Introduction To Equilibrium |
66%
From NCERT
NEET - 2023
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Which combination of the following substances will result in the formation of an acidic buffer when mixed?
 1 Weak acid and it's salt with a strong base. 2 Equal volumes of equimolar solutions of weak acid and weak base. 3 Strong acid and its salt with a strong base. 4 Strong acid and its salt with a weak base. (The pKa of acid = pKb of the base)
Subtopic:  Buffer |
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From NCERT
NEET - 2023
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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 |
64%
From NCERT
NEET - 2023
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The pH of the solution containing 50 mL each of 0.10 M sodium acetate and 0.01 M acetic acid is:
[Given pKa of CH3COOH = 4.57]
 1 2.57 2 5.57 3 3.57 4 4.57
Subtopic:  pH calculation |
63%
From NCERT
NEET - 2022
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