Problem 1
The unit of specific reaction rate constant for a firstorder (if the concentration is expressed in molarity) would be (a) \(s^{-1}\) (b) mole \(\mathrm{s}^{-1}\) (c) mole \(L^{-1} s^{-1}\) (d) mole \(L^{-1}\)
Problem 3
The activation energy for a simple chemical reaction \(\mathrm{A} \longrightarrow \mathrm{B}\) is \(\mathrm{E}\) in forward direction. The activation energy for reverse reaction (a) can be less than or more than \(\mathrm{E}\) (b) is always double of \(\mathrm{E}\) (c) is negative of \(\mathrm{E}_{4}\) (d) is always less than \(\mathrm{E}_{\mathrm{a}}\)
Problem 4
\(3 \mathrm{~A} \longrightarrow \mathrm{B}+\mathrm{C}\) It would be a zero order reaction when (a) the rate of reaction is proportional to square of concentration of \(\mathrm{A}\) (b) the rate of reaction remains same at any concentration of \(\mathrm{A}\) (c) the rate remains unchanged at any concentration of \(\mathrm{B}\) and \(\mathrm{C}\) (d) the rate of reaction doubles if concentration of is increased to double
Problem 5
The rate of reaction depends upon (a) molar concentration (b) atomic mass (c) equivalent mass (d) none of these
Problem 6
For a first-order reaction, the half-life period is independent of (a) initial concentration (b) cube root of initial concentration (c) first power of final concentration (d) square root of final concentration
Problem 9
The first-order rate constant for the decomposition of \(\mathrm{N}_{2} \mathrm{O}_{5}\) is \(6.2 \times 10^{-4} \mathrm{~s}^{-1}\). The half-life for this decomposition is (a) \(1177.7 \mathrm{~s}\) (b) \(1117.7\) (c) \(6.077 \mathrm{~s}\) (d) \(110.77\)
Problem 11
If the rate of the reaction is equal to the rate constant, the order of the reaction is (a) 3 (b) 0 (c) 1 (d) 2
Problem 12
Which of the following best explains the effects of a catalyst on the rate of a reversible reaction? (a) It decreases the rate of the reverse reaction (b) It increases the kinetic energy of the reacting molecules (c) It moves the equilibrium position to the right (d) It provides a new reaction path with a lower activation energy
Problem 14
For a chemical reaction \(\mathrm{A} \longrightarrow \mathrm{B}\), the rate of reaction doubles when the concentration of \(\mathrm{A}\) is in creased four times. The order of reaction for \(\mathrm{A}\) is (a) zero (b) one (c) two (d) half
Problem 15
The unit of second-order reaction rate constant is (a) \(\mathrm{L}^{-1} \cdot \mathrm{mol}^{-1} \mathrm{ds}^{-1}\) (b) \(\mathrm{L}^{2} \mathrm{~mol}^{-2} \mathrm{~s}^{-1}\) (c) L.mol \(^{-1} \mathrm{~s}^{-1}\) (d) \(s^{-t}\)
