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Equilibrium constant of a reaction got by reversing, scaling or adding given reactions

This type of question, asked 6 times: 26 Jul 2022, 29 Jan 2023, 4 Apr 2024, 8 Apr 2024, 4 Apr 2026 S1, 8 Apr 2026 S2. All 6 questions below, oldest first.

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  1. Question 1

    26 Jul 2022

    56
    At 298 K298\text{ }K, the equilibrium constant is 2×10152 \times10^{15} for the reaction:
    Cu(s)+2Ag+(aq)⇌Cu2+(aq)+2Ag(s)Cu(s) + 2Ag^{+}(aq) \rightleftharpoons Cu^{2 +}(aq) + 2Ag(s)
    The equilibrium constant for the reaction
    12Cu2+(aq)+Ag(s)⇌12Cu(s)+Ag+(aq)\frac{1}{2}Cu^{2 +}(aq) + Ag(s) \rightleftharpoons\frac{1}{2}Cu(s) +Ag^{+}(aq)
    is x×10−8x \times10^{- 8}. The value of xx is (Nearest Integer)

  2. Question 2

    29 Jan 2023

    149
    At 298 K298\text{ }K
    N2( g)+3H2( g)⇌2NH3( g),K1=4×105N_{2}(\text{ }g) + 3H_{2}(\text{ }g) \rightleftharpoons 2NH_{3}(\text{ }g),K_{1}= 4 \times10^{5}
    N2( g)+O2( g)⇌2NO(g),K2=1.6×1012N_{2}(\text{ }g) +O_{2}(\text{ }g) \rightleftharpoons 2NO(g),K_{2}= 1.6 \times10^{12}
    H2( g)+12O2( g)⇌H2O(g),K3=1.0×10−13H_{2}(\text{ }g) +\frac{1}{2}O_{2}(\text{ }g) \rightleftharpoons H_{2}O(g),K_{3}= 1.0 \times10^{- 13}
    Based on above equilibria, the equilibrium constant of the reaction, 2NH3( g)+52O2( g)⇌2NO(g)+3H2O(g)2NH_{3}(\text{ }g) +\frac{5}{2}O_{2}(\text{ }g) \rightleftharpoons 2NO(g) + 3H_{2}O(g) is ____×10−33\_\_\_\_ \times10^{- 33} (Nearest integer).

  3. Question 3

    4 Apr 2024

    121
    The equilibrium constant for the reaction
    SO3( g)⇌SO2( g)+12O2( g)SO_{3}(\text{ }g) \rightleftharpoons SO_{2}(\text{ }g) +\frac{1}{2}O_{2}(\text{ }g)
    is KC=4.9×10−2K_{C}= 4.9 \times10^{- 2}. The value of KCK_{C} for the reaction given below is 2SO2( g)+O2( g)⇌2SO3( g)2SO_{2}(\text{ }g) +O_{2}(\text{ }g) \rightleftharpoons 2SO_{3}(\text{ }g) is

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  4. Question 4

    8 Apr 2024

    38
    For the given hypothetical reactions, the equilibrium constants are as follows:
    X⇌Y;K1=1.0X \rightleftharpoons Y;K_{1}= 1.0
    Y⇌Z;K2=2.0Y \rightleftharpoons Z;K_{2}= 2.0
    Z⇌W;K3=4.0Z \rightleftharpoons W;K_{3}= 4.0
    The equilibrium constant for the reaction X⇌WX \rightleftharpoons W is

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  5. Question 5

    4 Apr 2026 S1

    30
    At T(K)T(K), the equilibrium constant of A2( g)+B2( g)⇌C(g)A_{2}(\text{ }g) +B_{2}(\text{ }g) \rightleftharpoons C(g) is 2.7×10−52.7 \times10^{- 5}. What is the equilibrium constant for 13 A2( g)+13 B2( g)⇌13C(g)\frac{1}{3}{\text{ }A}_{2}(\text{ }g) +\frac{1}{3}{\text{ }B}_{2}(\text{ }g) \rightleftharpoons\frac{1}{3}C(g) at the same temperature?

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  6. Question 6

    8 Apr 2026 S2

    30
    Consider the following reactions in which all the reactants and products are present in gaseous state 2xy⇌x2+y2 K1=2.5×1052xy \rightleftharpoons x_{2}+y_{2}{\text{ }K}_{1}= 2.5 \times10^{5}
    xy+12z2⇌xyz K2=5×10−3xy +\frac{1}{2}z_{2}\rightleftharpoons xyz\ K_{2}= 5 \times10^{- 3}
    The value of K3K_{3} for the equilibrium 12x2+12y2+12z2⇌xyz\frac{1}{2}x_{2}+\frac{1}{2}y_{2}+\frac{1}{2}z_{2}\rightleftharpoons xyz is :

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