Tuesday, 5 January 2016

Tricky Bio-Chemistry Interview Questions and Answers for freshers and experienced pdf

101. What is Internal energy?
Every substance poses definite amount of energy called internal energy or intrinsic energy (E).
Property of Enthalpy depends on.
Enthalpy is an extensive property, which depends on the amount of substance. For example - mass and volumes

102. How can you determine the reaction, taking place at constant pressure delta (H)?
The difference of Enthalpy’s of products and reactants H=Hp-Hr
Define heat of Combustion
The amount of heat liberated when one mole of any substance is completely burnt in oxygen is called heat of combustion H is negative for heat of combustion.
Define standard feat of formation
The amount of heat liberated of absorbed when one mole of compound is formed in its standard state from its elements in their standard state is called standard heat of formation ( Hf *)

103. What does Hess law states?
Hess law states that the heat of reaction is same whether the reaction takes place in one or several states. Therefore Q=Q1+Q2+Q3+…
Hess law is useful to calculate.
Heat of reactions
Lattice energy of ionic solids can be calculated by using.
Hess law-
Q = S+1/2 D +I.E-Ea-U

104. What is the lattice energy of Nacl?

105. Which branch of science deals with the transformation of chemical energy into electrical energy and vice versa?

106. In electronic conductors, what is the reason for flow of current?
Reason for flow of current is that moment of free electrons from higher negative potential to a lower positive potential region.

107. What is Galvanic cell?
A Galvanic cell or voltaic cell or electrochemical cell is a system in which a spontaneous chemical oxidation- reduction occurs and generates electrical energy.

108. Which electrode acts as reference electrode and gives its potential value?
Standard hydrogen electrode was taken as reference electrode whose potential is assumed zero.
Nelsons equation for any cell reaction is given by.
E = Eo + (2.303RT /nF) log [Oxidation form]/[reduced form]

109. To calculate the e.m.f of the cell when does the nelsons equation is use?
The Nernst equation is useful to calculate the e.m.f of the cell when the concentrations of solution are different from unity.

110. Define the Phenomenon catenation. Which element has maximum Catenation ability?
Carbon has maximum catenation ability. The self-linkage of the atoms of elements to produce long chains is called catenation.

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