Free Reversible Reactions MCQs with Answers
52 Reversible Reactions MCQs from Chemistry, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
A reversible reaction proceeds in both forward and backward directions, so reactants and products continue changing until dynamic equilibrium is established. The topic covers the meaning of equilibrium, the equality of forward and reverse rates, and how concentration, pressure and temperature disturb equilibrium, which is separate from the rate at which equilibrium is reached.
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52 questions · page 2 of 3
- A. C(s) + H2O(g) -> CO(g) +2H2(g)
- B. CH3O(l) + CH3CO2H(l) -> CH2CO2CH2(l) + H2O (l)
- C. Cu2+(aq) + 4NH2(aq) -> Cu(NH2)23+ (aq)
- D. N2O4(g) -> 2NO2
Explanation: The units of Kc are dependent upon the number of moles of (only of gases and liquids, not solids like in option A) reactants and products.
Correct answer: CH3O(l) + CH3CO2H(l) -> CH2CO2CH2(l) + H2O (l)- A. Extent of reaction
- B. Direction of reaction
- C. Both A and B
- D. None of the above
Explanation: The explanation for this question will be added soon.
Correct answer: Both A and B- A. KC
- B. K
- C. Kp
- D. None of these
Explanation: Option C is correct since equilibrium constant Kp represents the extent of the forward reaction in terms of the partial pressures of the…
Correct answer: Kp- A. Stability
- B. Reactivity
- C. Compressibility
- D. Instability
Explanation: The equilibrium constant for the decomposition of ozone to oxygen is 1055 at 25°C.2O3 → 3O2 Kc= 1055 at 25°CIt infers that at room…
Correct answer: Instability- A. High
- B. Low
- C. Negligible
- D. None of these
Explanation: The tendency of an irreversible reaction to go in the reverse direction is negligible.
Correct answer: Negligible- A. Maximum
- B. Minimum
- C. Zero
- D. Negligible
Explanation: OPTION A: Maximum is incorrect because, at equilibrium, the rate of the forward and reverse reactions is equal, so there is no net change…
Correct answer: Zero- A. Units
- B. No Units
- C. Both options A and B are correct
- D. A negative value
Explanation: The equilibrium constant formula is kc= concentration of right-hand-side / left-hand-side.
Correct answer: Both options A and B are correct28. When the number of moles of reactants and products are the same, the equilibrium constant will have:
- A. Negative value
- B. Large value
- C. No units
- D. Units
Explanation: OPTION A: A small (negative) Kc value (less than 1) indicates that there are more reactants than products at equilibrium.
Correct answer: No units- A. Kc
- B. K
- C. Kp
- D. None of these
Explanation: Option A is wrong because Kc is not the equilibrium constant for ideal gases in terms of partial pressure.
Correct answer: Kp- A. Reactants over products
- B. Products over reactants
- C. Product times Reactants
- D. None of these
Explanation: At 'equilibrium', the rate of the forward and reverse reactions are equal.
Correct answer: Products over reactants- A. No Reaction
- B. Backward Reaction
- C. Little Forward Reaction
- D. Complete Reaction
Explanation: A very small value of the equilibrium constant, Kc, indicates that the forward reaction (formation of products) is **very weak** compared…
Correct answer: Little Forward Reaction- A. Irreversible
- B. Unidirectional
- C. Multidirectional
- D. Reversible
Explanation: A reversible reaction is one in which the conversion of reactants to products and the conversion of products to reactants occur…
Correct answer: Reversible- A. Maximum
- B. Minimum
- C. Zero.
- D. Negligible
Explanation: Kp equals Kc times RT to the Δn. Kp is the equilibrium constant. Temperature, just like in all gas laws, needs to be in Kelvin and An…
Correct answer: Zero.- A. Spontaneous Reactions
- B. Exothermic Reaction
- C. Reversible Reaction
- D. Combustion Reaction
Explanation: A reversible reaction is a reaction in which the conversion of reactants to products and the conversion of products to reactants occur…
Correct answer: Reversible Reaction- A. Atoms
- B. Molecules
- C. Ions
- D. Moles
Explanation: Kc and Kp have the same value when reactants and products have the same number of "moles" asKp = Kc (RT)^∆n Since ∆n = 0, RT factor is…
Correct answer: Moles- A. Kc
- B. K
- C. Kp
- D. None of these
Explanation: The answer is C. For partial pressure equilibrium constant will always be denoted as Kp, where 'K' stands for equilibrium ratio of…
Correct answer: Kp- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: Explanation:It is the fact. Equilibrium constant is products/reactants.
Correct answer: Option C- A. mol3dm-6
- B. moldm-3
- C. mol-3dm6
- D. No unit
Explanation: A, B and C are incorrect since the given units aren't correct according to the equationD is correct since In equation both sides moles are…
Correct answer: No unit- A. N2 + 3H2--------> 2NH3
- B. SO2 + 2O2--------> 2SO3
- C. CO + H2O ----------> CO2 + H2
- D. 2NO2 + O2---------> 2NO3
Explanation: There are equal moles of reactants and products therefore Kc will have no units as they get cancelled out.
Correct answer: CO + H2O ----------> CO2 + H2- A. H2S2O7
- B. HSO4-
- C. SO3
- D. S
Explanation: In the contact process, sulfur dioxide (formed by roasting sulfur in oxygen) is reacted with oxygen to form sulfur trioxide, which is…
Correct answer: H2S2O7