Class 11 Chemistry DPP — Ch 6 — Equilibrium | 28 August 2026

A state in which the concentrations of reactants and products do not change with time is called:

A. static equilibrium B. chemical equilibrium C. dead equilibrium D. irreversible state

📝 SolutionChemical equilibrium is a dynamic state where the rates of forward and backward reactions become equal, so concentrations stay constant.

Chemical equilibrium is best described as:

A. static B. dynamic C. permanent D. non-reversible

📝 SolutionEquilibrium is dynamic — both forward and reverse reactions continue to occur, but at equal rates, so no net change is observed.

For a general reaction $aA + bB \rightleftharpoons cC + dD$, the equilibrium constant $K_c$ is given by:

A. $\frac{[A]^a[B]^b}{[C]^c[D]^d}$ B. $\frac{[C]^c[D]^d}{[A]^a[B]^b}$ C. $[A][B][C][D]$ D. $\frac{[C]+[D]}{[A]+[B]}$

📝 SolutionThe equilibrium constant is the ratio of the product of equilibrium concentrations of products to reactants, each raised to their stoichiometric coefficients.

Le Chatelier's principle states that if a system at equilibrium is subjected to a change, the system will:

A. remain unaffected B. shift to counteract the change C. shift to enhance the change D. stop reacting

📝 SolutionLe Chatelier's principle states that a system at equilibrium shifts in the direction that partially opposes (counteracts) the applied change.

Increasing pressure on a gaseous equilibrium favours the side with:

A. more moles of gas B. fewer moles of gas C. equal moles always D. no gas

📝 SolutionIncreasing pressure shifts equilibrium towards the side with fewer moles of gas, reducing the total volume and opposing the pressure increase.

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Class 11 · Chemistry

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