Secondary Cells

Q. <!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> Living organisms respond and adapt to their surroundings.

1. False
2. True

Q. Now Rancho got more curious and he wanted to check other batteries as well. So he tried his motorcycle battery this time. Again he made some observations. Which of the following are TRUE?

1. It consists of a lead anode
2. A grid of lead packed with lead dioxide $\left(Pb{O}_2\right)$ acts as cathode
3. It is non-rechargeable
4. A $38\%$ solution of sulphuric acid is used as an electrolyte

Q. Now he tried his hands with a calculator. I think you know whats coming next! Which of these observations of Rancho were TRUE?

1. It consists of a cadmium electrode (as anode)
2. At anode:
   $Cd\left(s\right)+2O{H}^{-}\left(aq\right)\to d\left(OH{)}_2\right(s)+2e^{-}$
3. At cathode:
   $Ni{O}_2\left(s\right)+2H_{2}O+2e^{-}\to Ni\left(OH{)}_2\right(s)+2O{H}^{-}(aq)$
4. A metal grid containing nickel (IV) oxide acts as cathode