261. The rxn: CH₄ + 2O₂ → CO₂ + 2H₂O is an example of:
A. Reversible rxn
B. Irreversible rxn
C. Endothermic rxn
D. None of these
262. Guldberg & Waage stated:
A. Acid base equilibrium
B. Law of mass action
C. Periodic law
D. Rule of Maximum Multiplicity
263. At the point when two reactants Aₙ and B are blended to give items C and D. The Qc at the initial stages of the reaction:
A. Is zero throughout
B. Decrease with time
C. Increase with time
D. Remains constant
264. 1 mole of acetic acid is reacted with 1 mole of ethyl alcohol to form 2/3 mole of ethyl acetate. The value of Kc is:
A. 2
B. 4
C. 3
D. 3/2
265. In which of the following cases does the rxn go much in the forward direction:
A. Kc = 10^2
B. Kc = 10^-2
C. Kc = 10
D. Kc = 1
266. In a given system, water and ice are in harmony. If pressure is applied to the above system:
A. More ice is formed
B. More water is formed
C. Amount of Ice and Water will remain the same
D. None of these
267. Consider the rxn PCl₅(g) → PCl₃(g) + Cl₂(g) in a closed vessel. What will be the effect on the equilibrium concentration of Cl₂ if we add more PCl₅:
A. It increases
B. It decreases
C. It remains unaffected
D. Cannot be predicted
268. For a reversible rxn, if the concentration of reactants is doubled at a steady temperature, the equilibrium constant will be:
A. Doubled
B. Halved
C. One-Fourth
D. Constant
269. The role of a catalyst in a reversible rxn is to:
A. Alter the equilibrium constant
B. Increase the rate of the forward rxn
C. Permit the equilibrium to be achieved quickly
D. Decrease the rate of the backward rxn
270. Value of Kc can be affected by a change in:
A. Temperature
B. Pressure
C. Concentration
D. All
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