Physical Chemistry Answers

One of the following statements is not true about the MOLECULARITY of a reaction
a. It is always a whole number
b. It is generally not exceeding three and never zero.
c. It reveals some basic facts about reaction mechanism
d. It does not reveal anything about the mechanism of the reaction

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9. Which of the following statements is true about ORDER of a reaction?
a. It is obtained from a single balanced equation
b. It is always a whole number
c. It cannot be obtained from a balanced chemical equation
d. It reveals some basic facts about reaction mechanism

The reaction: A → B follows first-order kinetics. The time taken for 0.8 mol of A to produce 0.6 mol of B is 1 hour. What is the time taken for conversion of 0.9 mol of A to produce 0.675 mol of B?

An acid solution with pH=6 at 25°C is diluted by10^2 times.The Ph of solution will be?

When a solution of benzoic acid was titrated with NaOH the pH of the solution half the acid neutralized was 4.2 . what is dissociation constant of acid

The half-life of a radioactive element with mass number 234 g is 2.5 x 105 years. How long after the isolation of a sample of this isotope will only one-six of the original mass be left?

After 300 seconds, half of nitrogen (IV) oxide gas has reacted. How much of the gas will react after 900 second if the reaction is first-order?

A reaction has the energy of activation of 84 kJ mol-1, what is the effect on the rate (other things being equal) of raising the temperature from 100 °C to 110 °C (R = 8.314 J mol-1 K-1)?
a. No effect on the rate of the reaction
b. The rate of the reaction increases
c. The rate of the reaction decreases
d. The rate of the reaction is doubled

A first-order reaction is 40% complete at the end of 50 min, in how many minutes will the reaction be 80% complete?