Types of Cells in Chemistry

A cell which supplies the current direct from the energy liberated inside it by the chemicals used in the cell.

A cell that does not generate current, but rather converts charging current into chemical energy, which is then stored and utilized afterwards.

Consists of two inter-connected carbon plates with a zinc plate in between them, dipped in dilute H2SO4 with added crystals of K2Cr2O7 to avoid polarization.

<p>The H2SO4, K2Cr2O7, and water react with the zinc electrode to form chromic oxide, which then reacts with H2SO4 to convert into chromic sulphate.</p> Signup and view all the answers

<p>To avoid polarization in the dilute H2SO4 solution.</p> Signup and view all the answers

<p>It is useful where strong current is needed for a short time.</p> Signup and view all the answers

<p>The primary difference is the use of chromic acid in place of K2Cr2O7 in the Modified Bichromate Cell, while the Dry Cell uses a Zn container as the anode and a carbon (graphite) rod surrounded by MnO2 and carbon as the cathode.</p> Signup and view all the answers

<p>The paste acts as a depolariser in the Dry Cell.</p> Signup and view all the answers

<p>The advantages of the Dry Cell include the fact that the zinc does not react with NH4Cl in open circuit and can be kept for a longer time without damage.</p> Signup and view all the answers

<p>The disadvantages of the Dry Cell include voltage drops when current is drawn rapidly, and the slow dissolution of zinc metal due to the acidic electrolytic medium.</p> Signup and view all the answers

<p>The primary function of the Mercury Cell is to provide power for low current devices like hearing aids and watches.</p> Signup and view all the answers

<p>At the anode, the electrode reaction in the Mercury Cell is: Zn(Hg) + 2OH- -&gt; ZnO (s) + H2O +2e</p> Signup and view all the answers

<p>At the cathode, the electrode reaction in the Mercury Cell is: HgO + H2O + 2e -&gt; Hg (l) + 2OH-</p> Signup and view all the answers

<p>The overall cell reaction represented by in the Mercury Cell is: Zn(Hg) + HgO(s) -&gt; ZnO(s) + Hg(l)</p> Signup and view all the answers

<p>The electrical potential is 1.1 V when the concentration of Zn2+ &amp; Cu2+ ions is unity in the Two Fluid Cell.</p> Signup and view all the answers

<p>The porous pot in the Daniel Cell prevents diffusion but allows the passage of ions when electricity flows.</p> Signup and view all the answers