Q4 of 37 Page 1

Read the given passage and answer the questions

A Lead storage battery is the most important type of secondary cell having a lead anode and a grid of lead packed with PbO2 as cathode. A 38% solution of sulphuric acid is used as electrolyte. (Density=1.294 g mL-1) The battery holds 3.5 L of the acid. During the discharge of the battery, the density of H2SO4 falls to 1.139 g mL-1. (20% H2SO4 by mass)


The lead storage battery is considered a secondary cell. Why?



Secondary cells can be recharged by passing electric current and they can be used again and again. Here, the reactions can be reversed by an external electrical energy source. Lead storage battery can be used again and again as they can be charged again after discharging.


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2

Read the given passage and answer the questions

A Lead storage battery is the most important type of secondary cell having a lead anode and a grid of lead packed with PbO2 as cathode. A 38% solution of sulphuric acid is used as electrolyte. (Density=1.294 g mL-1) The battery holds 3.5 L of the acid. During the discharge of the battery, the density of H2SO4 falls to 1.139 g mL-1. (20% H2SO4 by mass)


How much electricity in terms of Faraday is required to carry out the reduction of one mole of PbO2?


 3

Read the given passage and answer the questions

A Lead storage battery is the most important type of secondary cell having a lead anode and a grid of lead packed with PbO2 as cathode. A 38% solution of sulphuric acid is used as electrolyte. (Density=1.294 g mL-1) The battery holds 3.5 L of the acid. During the discharge of the battery, the density of H2SO4 falls to 1.139 g mL-1. (20% H2SO4 by mass)


What is the molarity of sulphuric acid before discharge?


 5

Read the given passage and answer the question

A Lead storage battery is the most important type of secondary cell having a lead anode and a grid of lead packed with PbO2 as cathode. A 38% solution of sulphuric acid is used as electrolyte. (Density=1.294 g mL-1) The battery holds 3.5 L of the acid. During the discharge of the battery, the density of H2SO4 falls to 1.139 g mL-1. (20% H2SO4 by mass)


Write the products of electrolysis when dilute sulphuric acid is electrolysed using Platinum electrodes.


 6

Question is one word answer

Name the substance used as depressant in the separation of two sulphide ores in Froth floatation method.