Q8 of 33 Page 1

In the electrolysis of water,

(a) Name the gas collected at anode and cathode


(b) Why is the volume of gas collected at one electrode double than the other?


(c) What would happen if dil H2SO4 is not added to water?

(a) Hydrogen gas is collected at cathode and oxygen gas at the anode.


(b) Hydrogen gas volume is double than oxygen gas as water contains 2 parts of hydrogen and 1 part of oxygen.


(c) Since pure water is a bad conductor of electricity so if dilute sulphuric acid will not be added electrolysis of water cannot occur.


More from this chapter

All 33 →
6

(i) What is the function of earth wire in electrical instruments?

(ii) Explain what is short-circuiting an electric supply.


(iii) What is the usual current rating of the fuse wire in the line to feed (a) Lights and fans? (b) Appliances of 2kW or more power?

 7

Draw a circuit diagram of an electric circuit containing a cell, a key, an ammeter, a resistor of 4Ω in series with a combination of two resistors (8Ω each) in parallel and a voltmeter across parallel combination. Each of them dissipates maximum energy and can withstand a maximum power of 16W without melting. Find the maximum current that can flow through the three resistors.

 9

Differentiate between the arrangement of elements in Mendeleev’s periodic table and Modern periodic table.

 10

Explain the ways in which glucose is broken down in absence of oxygen.