04. CHEMICAL KINETICS[KARNATAKA CET EXCLUSIVE]
CHEMISTRY(KCET)

285430 Which is a wrong statement?

1 Rate constant, \(k=\) Arrhenius constant \(A\) : if \(E_a=0\)
2 \(e^{-E_a / R T}\) gives the fraction of reactant molecules that are activated at the given temperature.
3 In \(k v s \frac{1}{T}\) plot is a straight line.
4 presence of catalyst will not alter the value of \(E_a\).
CHEMISTRY(KCET)

285429 The plot of \(t_{1 / 2} v / \mathrm{s}[R]_0\) for a reaction is a straightline parallel to \(x\)-axis. The unit for the rate constant of this reaction is

1 \(\mathrm{mol} \mathrm{L}^{-1} \mathrm{~s}\)
2 \(\mathrm{mol} \mathrm{L}^{-1} \mathrm{~s}^{-1}\)
3 \(\mathrm{L} \mathrm{mol}^{-1} \mathrm{~s}^{-1}\)
4 \(\mathrm{s}^{-1}\)
CHEMISTRY(KCET)

285412 For the reaction, \(\mathrm{A} \rightleftharpoons \mathrm{B}, \mathrm{E}_{\mathrm{a}}=50 \mathrm{~kJ} \mathrm{~mol}^{-1}\) and \(\Delta \mathrm{H}=-20 \mathrm{~kJ} \mathrm{~mol}^{-1}\). When a catalyst is added, \(\mathrm{E}_{\mathrm{a}}\) decreases by \(10 \mathrm{~kJ} \mathrm{~mol}^{-1}\). What is the \(\mathrm{E}_{\mathrm{a}}\) for the backward reaction in the presence of catalyst?

1 \(60 \mathrm{~kJ} \mathrm{~mol}^{-1}\)
2 \(40 \mathrm{~kJ} \mathrm{~mol}^{-1}\)
3 \(70 \mathrm{~kJ} \mathrm{~mol}^{-1}\)
4 \(20 \mathrm{~kJ} \mathrm{~mol}^{-1}\)
CHEMISTRY(KCET)

285413 Fro the reation \(\mathrm{PCl}_5 \rightarrow \mathrm{PCl}_3+\mathrm{Cl}_2\), rate and rate constant are \(1.0 \times 10^{-4} \mathrm{~mol} \mathrm{~L}^{-1} \mathrm{~s}^{-1}\) and \(3.4 \times 10^{-5} \mathrm{~s}^{-1}\) respectively at a given instant. The molar concentration of \(\mathrm{PCl}_5\) at that instant is :

1 \(8.0 \mathrm{~mol} \mathrm{~L}^{-1}\)
2 \(3.0 \mathrm{~mol} \mathrm{~L}^{-1}\)
3 \(0.2 \mathrm{~mol} \mathrm{~L}^{-1}\)
4 \(2.0 \mathrm{~mol} \mathrm{~L}^{-1}\)
CHEMISTRY(KCET)

285414 Which one of the following does not represent Arrhenius equation?

1 \(\log \mathrm{k}=\log \mathrm{A}-\frac{\mathrm{E}_{\mathrm{a}}}{2.303 \mathrm{RT}}\)
2 \(\mathrm{k}=\mathrm{Ae}^{-\mathrm{E}_{\mathrm{a}} / \mathrm{RT}}\)
3 \(\ln \mathrm{k}=-\frac{\mathrm{E}_{\mathrm{a}}}{R T}+\ln \mathrm{A}\)
4 \(\mathrm{k}=\mathrm{Ae}^{\mathrm{E}_{\mathrm{a}} / \mathrm{RT}}\)
CHEMISTRY(KCET)

285430 Which is a wrong statement?

1 Rate constant, \(k=\) Arrhenius constant \(A\) : if \(E_a=0\)
2 \(e^{-E_a / R T}\) gives the fraction of reactant molecules that are activated at the given temperature.
3 In \(k v s \frac{1}{T}\) plot is a straight line.
4 presence of catalyst will not alter the value of \(E_a\).
CHEMISTRY(KCET)

285429 The plot of \(t_{1 / 2} v / \mathrm{s}[R]_0\) for a reaction is a straightline parallel to \(x\)-axis. The unit for the rate constant of this reaction is

1 \(\mathrm{mol} \mathrm{L}^{-1} \mathrm{~s}\)
2 \(\mathrm{mol} \mathrm{L}^{-1} \mathrm{~s}^{-1}\)
3 \(\mathrm{L} \mathrm{mol}^{-1} \mathrm{~s}^{-1}\)
4 \(\mathrm{s}^{-1}\)
CHEMISTRY(KCET)

285412 For the reaction, \(\mathrm{A} \rightleftharpoons \mathrm{B}, \mathrm{E}_{\mathrm{a}}=50 \mathrm{~kJ} \mathrm{~mol}^{-1}\) and \(\Delta \mathrm{H}=-20 \mathrm{~kJ} \mathrm{~mol}^{-1}\). When a catalyst is added, \(\mathrm{E}_{\mathrm{a}}\) decreases by \(10 \mathrm{~kJ} \mathrm{~mol}^{-1}\). What is the \(\mathrm{E}_{\mathrm{a}}\) for the backward reaction in the presence of catalyst?

1 \(60 \mathrm{~kJ} \mathrm{~mol}^{-1}\)
2 \(40 \mathrm{~kJ} \mathrm{~mol}^{-1}\)
3 \(70 \mathrm{~kJ} \mathrm{~mol}^{-1}\)
4 \(20 \mathrm{~kJ} \mathrm{~mol}^{-1}\)
CHEMISTRY(KCET)

285413 Fro the reation \(\mathrm{PCl}_5 \rightarrow \mathrm{PCl}_3+\mathrm{Cl}_2\), rate and rate constant are \(1.0 \times 10^{-4} \mathrm{~mol} \mathrm{~L}^{-1} \mathrm{~s}^{-1}\) and \(3.4 \times 10^{-5} \mathrm{~s}^{-1}\) respectively at a given instant. The molar concentration of \(\mathrm{PCl}_5\) at that instant is :

1 \(8.0 \mathrm{~mol} \mathrm{~L}^{-1}\)
2 \(3.0 \mathrm{~mol} \mathrm{~L}^{-1}\)
3 \(0.2 \mathrm{~mol} \mathrm{~L}^{-1}\)
4 \(2.0 \mathrm{~mol} \mathrm{~L}^{-1}\)
CHEMISTRY(KCET)

285414 Which one of the following does not represent Arrhenius equation?

1 \(\log \mathrm{k}=\log \mathrm{A}-\frac{\mathrm{E}_{\mathrm{a}}}{2.303 \mathrm{RT}}\)
2 \(\mathrm{k}=\mathrm{Ae}^{-\mathrm{E}_{\mathrm{a}} / \mathrm{RT}}\)
3 \(\ln \mathrm{k}=-\frac{\mathrm{E}_{\mathrm{a}}}{R T}+\ln \mathrm{A}\)
4 \(\mathrm{k}=\mathrm{Ae}^{\mathrm{E}_{\mathrm{a}} / \mathrm{RT}}\)
CHEMISTRY(KCET)

285430 Which is a wrong statement?

1 Rate constant, \(k=\) Arrhenius constant \(A\) : if \(E_a=0\)
2 \(e^{-E_a / R T}\) gives the fraction of reactant molecules that are activated at the given temperature.
3 In \(k v s \frac{1}{T}\) plot is a straight line.
4 presence of catalyst will not alter the value of \(E_a\).
CHEMISTRY(KCET)

285429 The plot of \(t_{1 / 2} v / \mathrm{s}[R]_0\) for a reaction is a straightline parallel to \(x\)-axis. The unit for the rate constant of this reaction is

1 \(\mathrm{mol} \mathrm{L}^{-1} \mathrm{~s}\)
2 \(\mathrm{mol} \mathrm{L}^{-1} \mathrm{~s}^{-1}\)
3 \(\mathrm{L} \mathrm{mol}^{-1} \mathrm{~s}^{-1}\)
4 \(\mathrm{s}^{-1}\)
CHEMISTRY(KCET)

285412 For the reaction, \(\mathrm{A} \rightleftharpoons \mathrm{B}, \mathrm{E}_{\mathrm{a}}=50 \mathrm{~kJ} \mathrm{~mol}^{-1}\) and \(\Delta \mathrm{H}=-20 \mathrm{~kJ} \mathrm{~mol}^{-1}\). When a catalyst is added, \(\mathrm{E}_{\mathrm{a}}\) decreases by \(10 \mathrm{~kJ} \mathrm{~mol}^{-1}\). What is the \(\mathrm{E}_{\mathrm{a}}\) for the backward reaction in the presence of catalyst?

1 \(60 \mathrm{~kJ} \mathrm{~mol}^{-1}\)
2 \(40 \mathrm{~kJ} \mathrm{~mol}^{-1}\)
3 \(70 \mathrm{~kJ} \mathrm{~mol}^{-1}\)
4 \(20 \mathrm{~kJ} \mathrm{~mol}^{-1}\)
CHEMISTRY(KCET)

285413 Fro the reation \(\mathrm{PCl}_5 \rightarrow \mathrm{PCl}_3+\mathrm{Cl}_2\), rate and rate constant are \(1.0 \times 10^{-4} \mathrm{~mol} \mathrm{~L}^{-1} \mathrm{~s}^{-1}\) and \(3.4 \times 10^{-5} \mathrm{~s}^{-1}\) respectively at a given instant. The molar concentration of \(\mathrm{PCl}_5\) at that instant is :

1 \(8.0 \mathrm{~mol} \mathrm{~L}^{-1}\)
2 \(3.0 \mathrm{~mol} \mathrm{~L}^{-1}\)
3 \(0.2 \mathrm{~mol} \mathrm{~L}^{-1}\)
4 \(2.0 \mathrm{~mol} \mathrm{~L}^{-1}\)
CHEMISTRY(KCET)

285414 Which one of the following does not represent Arrhenius equation?

1 \(\log \mathrm{k}=\log \mathrm{A}-\frac{\mathrm{E}_{\mathrm{a}}}{2.303 \mathrm{RT}}\)
2 \(\mathrm{k}=\mathrm{Ae}^{-\mathrm{E}_{\mathrm{a}} / \mathrm{RT}}\)
3 \(\ln \mathrm{k}=-\frac{\mathrm{E}_{\mathrm{a}}}{R T}+\ln \mathrm{A}\)
4 \(\mathrm{k}=\mathrm{Ae}^{\mathrm{E}_{\mathrm{a}} / \mathrm{RT}}\)
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CHEMISTRY(KCET)

285430 Which is a wrong statement?

1 Rate constant, \(k=\) Arrhenius constant \(A\) : if \(E_a=0\)
2 \(e^{-E_a / R T}\) gives the fraction of reactant molecules that are activated at the given temperature.
3 In \(k v s \frac{1}{T}\) plot is a straight line.
4 presence of catalyst will not alter the value of \(E_a\).
CHEMISTRY(KCET)

285429 The plot of \(t_{1 / 2} v / \mathrm{s}[R]_0\) for a reaction is a straightline parallel to \(x\)-axis. The unit for the rate constant of this reaction is

1 \(\mathrm{mol} \mathrm{L}^{-1} \mathrm{~s}\)
2 \(\mathrm{mol} \mathrm{L}^{-1} \mathrm{~s}^{-1}\)
3 \(\mathrm{L} \mathrm{mol}^{-1} \mathrm{~s}^{-1}\)
4 \(\mathrm{s}^{-1}\)
CHEMISTRY(KCET)

285412 For the reaction, \(\mathrm{A} \rightleftharpoons \mathrm{B}, \mathrm{E}_{\mathrm{a}}=50 \mathrm{~kJ} \mathrm{~mol}^{-1}\) and \(\Delta \mathrm{H}=-20 \mathrm{~kJ} \mathrm{~mol}^{-1}\). When a catalyst is added, \(\mathrm{E}_{\mathrm{a}}\) decreases by \(10 \mathrm{~kJ} \mathrm{~mol}^{-1}\). What is the \(\mathrm{E}_{\mathrm{a}}\) for the backward reaction in the presence of catalyst?

1 \(60 \mathrm{~kJ} \mathrm{~mol}^{-1}\)
2 \(40 \mathrm{~kJ} \mathrm{~mol}^{-1}\)
3 \(70 \mathrm{~kJ} \mathrm{~mol}^{-1}\)
4 \(20 \mathrm{~kJ} \mathrm{~mol}^{-1}\)
CHEMISTRY(KCET)

285413 Fro the reation \(\mathrm{PCl}_5 \rightarrow \mathrm{PCl}_3+\mathrm{Cl}_2\), rate and rate constant are \(1.0 \times 10^{-4} \mathrm{~mol} \mathrm{~L}^{-1} \mathrm{~s}^{-1}\) and \(3.4 \times 10^{-5} \mathrm{~s}^{-1}\) respectively at a given instant. The molar concentration of \(\mathrm{PCl}_5\) at that instant is :

1 \(8.0 \mathrm{~mol} \mathrm{~L}^{-1}\)
2 \(3.0 \mathrm{~mol} \mathrm{~L}^{-1}\)
3 \(0.2 \mathrm{~mol} \mathrm{~L}^{-1}\)
4 \(2.0 \mathrm{~mol} \mathrm{~L}^{-1}\)
CHEMISTRY(KCET)

285414 Which one of the following does not represent Arrhenius equation?

1 \(\log \mathrm{k}=\log \mathrm{A}-\frac{\mathrm{E}_{\mathrm{a}}}{2.303 \mathrm{RT}}\)
2 \(\mathrm{k}=\mathrm{Ae}^{-\mathrm{E}_{\mathrm{a}} / \mathrm{RT}}\)
3 \(\ln \mathrm{k}=-\frac{\mathrm{E}_{\mathrm{a}}}{R T}+\ln \mathrm{A}\)
4 \(\mathrm{k}=\mathrm{Ae}^{\mathrm{E}_{\mathrm{a}} / \mathrm{RT}}\)
CHEMISTRY(KCET)

285430 Which is a wrong statement?

1 Rate constant, \(k=\) Arrhenius constant \(A\) : if \(E_a=0\)
2 \(e^{-E_a / R T}\) gives the fraction of reactant molecules that are activated at the given temperature.
3 In \(k v s \frac{1}{T}\) plot is a straight line.
4 presence of catalyst will not alter the value of \(E_a\).
CHEMISTRY(KCET)

285429 The plot of \(t_{1 / 2} v / \mathrm{s}[R]_0\) for a reaction is a straightline parallel to \(x\)-axis. The unit for the rate constant of this reaction is

1 \(\mathrm{mol} \mathrm{L}^{-1} \mathrm{~s}\)
2 \(\mathrm{mol} \mathrm{L}^{-1} \mathrm{~s}^{-1}\)
3 \(\mathrm{L} \mathrm{mol}^{-1} \mathrm{~s}^{-1}\)
4 \(\mathrm{s}^{-1}\)
CHEMISTRY(KCET)

285412 For the reaction, \(\mathrm{A} \rightleftharpoons \mathrm{B}, \mathrm{E}_{\mathrm{a}}=50 \mathrm{~kJ} \mathrm{~mol}^{-1}\) and \(\Delta \mathrm{H}=-20 \mathrm{~kJ} \mathrm{~mol}^{-1}\). When a catalyst is added, \(\mathrm{E}_{\mathrm{a}}\) decreases by \(10 \mathrm{~kJ} \mathrm{~mol}^{-1}\). What is the \(\mathrm{E}_{\mathrm{a}}\) for the backward reaction in the presence of catalyst?

1 \(60 \mathrm{~kJ} \mathrm{~mol}^{-1}\)
2 \(40 \mathrm{~kJ} \mathrm{~mol}^{-1}\)
3 \(70 \mathrm{~kJ} \mathrm{~mol}^{-1}\)
4 \(20 \mathrm{~kJ} \mathrm{~mol}^{-1}\)
CHEMISTRY(KCET)

285413 Fro the reation \(\mathrm{PCl}_5 \rightarrow \mathrm{PCl}_3+\mathrm{Cl}_2\), rate and rate constant are \(1.0 \times 10^{-4} \mathrm{~mol} \mathrm{~L}^{-1} \mathrm{~s}^{-1}\) and \(3.4 \times 10^{-5} \mathrm{~s}^{-1}\) respectively at a given instant. The molar concentration of \(\mathrm{PCl}_5\) at that instant is :

1 \(8.0 \mathrm{~mol} \mathrm{~L}^{-1}\)
2 \(3.0 \mathrm{~mol} \mathrm{~L}^{-1}\)
3 \(0.2 \mathrm{~mol} \mathrm{~L}^{-1}\)
4 \(2.0 \mathrm{~mol} \mathrm{~L}^{-1}\)
CHEMISTRY(KCET)

285414 Which one of the following does not represent Arrhenius equation?

1 \(\log \mathrm{k}=\log \mathrm{A}-\frac{\mathrm{E}_{\mathrm{a}}}{2.303 \mathrm{RT}}\)
2 \(\mathrm{k}=\mathrm{Ae}^{-\mathrm{E}_{\mathrm{a}} / \mathrm{RT}}\)
3 \(\ln \mathrm{k}=-\frac{\mathrm{E}_{\mathrm{a}}}{R T}+\ln \mathrm{A}\)
4 \(\mathrm{k}=\mathrm{Ae}^{\mathrm{E}_{\mathrm{a}} / \mathrm{RT}}\)