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

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.

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?

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

List three differences between arteries and veins.