Physical Pharmacy-II

The half life of a first order reaction is 4 years. What is shelf life.

• 0.02

• 0.03

• 0.17

• 0.61

In chemical kinetics the rate of reaction is expressed as (-dc/dt) where dc, refers to which concentration?

• Catalyst

• Product

• Reactant

• Solvent medium

In a second order reaction a=b. 20% of the reaction is completed in 500 seconds.calculate the time required for reaction to complete 60%.

• 300 sec

• 100sec

• 4000sec

• 50sec

The integral equation for a reaction K=X/at.x/(a-x) is concerned with the order.

• First

• Pseudo first

• Second

• Zero

In the photochemical degradation of multisulphapreparation the order that a reaction does follow is

• First

• Pseudo first

• Second

• Zero

In the degradation studies of aspirin suspension the orders observed initially and at the end

• First, second

• First,zero

• Second,first

• Zero, first

In reactions that follow 1st order kinetics,half life is expressed by equation.

• 0.693/k1

• 0.301/k1

• 0.105/k1

• K1/0.693

Which of the following dosage forms exhibit faster rate of reaction under normal conditions

• Emulsions

• Ointments

• Solutions

• Suspensions

Which one of the following orders have abundant applications in biological processes?

• First

• Second

• Third

• Zero

A second order reaction follows pseudo first order reaction when the concentrations of

• 2 reactants are high

• 2 reactants are low

• One reactant is far higher than other reactant

• 2 reactants are equal