Previous Year Papers

Download Solved Question Papers Free for Offline Practice and view Solutions Online.

Test Series

Take Zigya Full and Sectional Test Series. Time it out for real assessment and get your results instantly.

Test Yourself

Practice and master your preparation for a specific topic or chapter. Check you scores at the end of the test.

Electrochemistry

Long Answer Type

111. What is the Nernst equation for the Potential of an electrode? Can Nernst equation be applied to the cell relation ? Apply this equation to a general reaction.

aA + bB \to cC + dD

128 Views

112. Explain Kohlrausch’s law of independent migration of ions. Mention one application of Kohlrausch’s law.

900 Views

Short Answer Type

113. How does molar conductivity vary with concentration for (i) weak electrolyte and for (ii) strong electolyte? Give reasons for these variations.

2392 Views

114. State and explain Faraday's law of electrolysis?

133 Views

Long Answer Type

115. State and explain Faraday's law of electrolysis?

321 Views

116. Show that the electrical work obtainable from a galvanic cell is given by the expression.
$∆ G ° = - nFE °_{cell}$

The cell potential is simply related to the free energy change for the reaction. In an electro chemical cell the system does work by transferring the electric charge through an external circuit. The free energy change

∆ G

is equal to electrical work done.

∆ G = W_{electrical}

For reaction occurring in a electrochemical cell whose electrodes differ in potential by E_cell, the work done when amount of charge nF is transferred is given by

W_{elect} = - {nFE}_{cell}

∴

∆ G = - {nFE}_{cell}

Under standard state conditions
ΔG° = – n FE°_cell.

174 Views

Short Answer Type

117. What are fuel cells? Write the reaction of a oxygen hydrogen fuel cell.

115 Views

118.

What is a mercury cell? Give the electrode reactions?

1935 Views

119. What is the effect of change in (a) concentration, (b) temperature on the electrode potential of a given half-cell?

143 Views

120. Iron does not rust even if the zinc coating is broken in a galvanised iron pipe but, rusting occurs much faster if the tin coating over iron is broken. Explain?

811 Views