Select Chapter Topics:

For the reaction R → P, the concentration of a reactant changes from 0.03 M to 0.02 M in 25 minutes.

The average rate of reaction in M sec^{-1} is-

1. 6.67×10^{-5} M s^{-1}

2. 5.67×10^{-5} M s^{-1}

3. 6.67×10^{-6} M s^{-1}

4. 5.67×10^{-6} M s^{-1}

The average rate of reaction in M sec

1. 6.67×10

2. 5.67×10

3. 6.67×10

4. 5.67×10

Subtopic: Definition, Rate Constant, Rate Law |

67%

From NCERT

Please attempt this question first.

Hints

Please attempt this question first.

In a reaction, 2A → Products, the concentration of A decreases from 0.5 mol L^{−1} to 0.4 mol L^{−1} in 10 minutes.

The rate during this interval is-

1. 5×10^{-3}M min^{-1}

2. 8×10^{-3}M min^{-1}

3. 9×10^{-3}M min^{-1}

4. 3×10^{-3}M min^{-1}

The rate during this interval is-

1. 5×10

2. 8×10

3. 9×10

4. 3×10

Subtopic: Definition, Rate Constant, Rate Law |

66%

From NCERT

Please attempt this question first.

Hints

Please attempt this question first.

For a reaction, A + B → Product; the rate law is given by, r=k[A]^{1/2}[B]^{2}. The order of the reaction is:

1. | -1.5 | 2. | 1.5 |

3. | 0.5 | 4. | 2.5 |

Subtopic: Order, Molecularity and Mechanism |

77%

From NCERT

Please attempt this question first.

Hints

Please attempt this question first.

The conversion of molecules X to Y follows second order kinetics. If concentration of X is increased to three times, then the rate of formation of Y will -

1. Decreases by 3 times

2. Increase by 3 times

3. Decreases by 9 times

4. Increase by 9 times

** **

1. Decreases by 3 times

2. Increase by 3 times

3. Decreases by 9 times

4. Increase by 9 times

Subtopic: Order, Molecularity and Mechanism |

74%

From NCERT

Please attempt this question first.

Hints

Please attempt this question first.

A first order reaction has a rate constant 1.15 x 10^{−3} s^{−1}. The time required to convert 5g of this reactant into 3g is-

1. 424 s

2. 444 s

3. 464 s

4. 484 s

1. 424 s

2. 444 s

3. 464 s

4. 484 s

Subtopic: First Order Reaction Kinetics |

61%

From NCERT

Please attempt this question first.

Hints

Please attempt this question first.

Time required to decompose SO_{2}Cl_{2} to half of its initial amount is 60 minutes. If the decomposition is a first order reaction, the rate constant of the reaction in sec^{-1 }is-

1. 1.9×10^{-4} s^{-1}

2. 1.7×10^{-4} s^{-1}

3. 2.2×10^{-4} s^{-1}

4. 1.6×10^{-4} s^{-1}

1. 1.9×10

2. 1.7×10

3. 2.2×10

4. 1.6×10

Subtopic: First Order Reaction Kinetics |

66%

From NCERT

Please attempt this question first.

Hints

Please attempt this question first.

Rate constant (k) and temperature (T) are related as :

1. \(k \,\, = A\, \, e^{\frac{-E_{a}}{RT}}\)

2. \(k \,\, = A\, \, e^{\frac{RT}{-E_{a}}}\)

3. \(k \,\, = A\, \, e^{\frac{E_{a}}{RT}}\)

4. None of the above

1. \(k \,\, = A\, \, e^{\frac{-E_{a}}{RT}}\)

2. \(k \,\, = A\, \, e^{\frac{RT}{-E_{a}}}\)

3. \(k \,\, = A\, \, e^{\frac{E_{a}}{RT}}\)

4. None of the above

Subtopic: Arrhenius Equation |

92%

From NCERT

Please attempt this question first.

Hints

Please attempt this question first.

The rate of the chemical reaction doubles for an increase of 10 K in absolute temperature from 298 K. The value of E_{a} is-

1. 49.5 kJ mol^{-1}

2. 52.9 kJ mol^{-1}

3. 55.5 kJ mol^{-1}

4. 57.9 kJ mol^{-1}

1. 49.5 kJ mol

2. 52.9 kJ mol

3. 55.5 kJ mol

4. 57.9 kJ mol

Subtopic: Arrhenius Equation |

62%

From NCERT

Please attempt this question first.

Hints

Please attempt this question first.

The activation energy for the reaction 2HI_{(g)} → H_{2} + I_{2(g)} is 209.5 kJ mol^{−1} at 581K. The fraction of molecules of reactants having energy equal to or greater than activation energy is-

1. 2.67×10^{-19}

2. 3.57×10^{-18}

3. 4.67×10^{-17}

4. 1.47×10^{-19}

1. 2.67×10

2. 3.57×10

3. 4.67×10

4. 1.47×10

Subtopic: Arrhenius Equation |

From NCERT

Please attempt this question first.

Hints

Please attempt this question first.