Tuesday, 5 January 2016

Common Bio-Chemistry Interview Questions and Answers pdf

91. Define Ionic product of water. What is its value?
The product concentrations H+ and OH- in pure water are in aqueous solutions at a given temperature is known as Ionic Product of water. Its value is 1.0 * 10-14 moles2 / litre2.

92. What is PH? What are the units of PH?
PH is the negative logarithm of the hydrogen Ion Concentration express4ed in moles/liter of aqueous solution.
PH of buffer solution is calculated by.
Henderson’s equation
Name the best indicator
Phenolphthalein, PH range 8.3 to 10.0

Chemical kinetics deals with study of.
Rates and mechanisms of chemical and Biochemical reactions

93. What does Thermodynamics helps in predicting?
Predicting the feasibility of reaction and does not indicate the rate of chemical reaction

94. What does the expression –dc/dt indicates?
Rate of reaction can be expressed as –dc/dt where dc is small decreasing concentration in time dt seconds, (-) sign indicates that the concentration decreases with time.
For every 10 degrees rise of temperature, the rate of reaction is generally.
Doubled

94. Which equation gives the relation between specific rate (k) and Temperature?
Arrhenius equation K = Ae-E a / R T
In some reactions, Rate of reaction is directly proportional to.
Concentration of catalyst
Catalyst used in Bio-Chemical reactions is called.
Enzymes
Reactions catalyzed by light are called as.
Photo catalyzed or Photosensitised reactions
Define order of reaction
The order of reaction is the number of moles whose concentrations determine the rate of a reaction at a given temperature
Give the integrated equation for first order reaction.
K = (2.303 / t) * log (a / a-x)
Rate equation of first order reaction is.
dx/dt = K * (a-x)
where ‘a’ is the initial concentration of reactants
‘x’ is the amount reacted in time t seconds

95. What is Threshold energy?
The minimum amount of energy required for the reaction to takes place is called threshold energy.

96. What is activation energy?
The difference between Threshold energy and average energy of the molecules is called activation energy.
Ina chemical reaction lowers the rate of reaction the greater will be.
The activation energy

97. How do you define the molecularity of a reaction?
The number of species participating in the slowest step of the reaction is called molecularity of the reaction.
Define Equilibrium state
The chemical reaction at one time the rate of forward and backward reaction becomes equal that state is called Equilibrium state.
In a chemical equilibrium, the following properties remain unchanged with time. Pressure, Temperature, density, color
Pressure, Temperature, density, color

98. Who proposed law of mass action? What does it states?
Laws of mass action were proposed by Gulberg and Waage. The rate of chemical reaction is directly proportional to the product of the active masses of the reactants (molar concentrations of the reactants)

99. What is Kc?
Kc is the equilibrium constants when the concentrations are expressed in moles/litre
Kc = product of concentrate ions of products / product of concentrate ions of reactants
Mole fraction of the gas X total pressure gives.
Partial pressure of a gas

100. The expression q=delta (E)-W is? What does it states?
1st law of thermodynamics may be represented as q= E-W
According to this law the energy can neither be created nor destroyed, but can be converted into one form to another.

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