Explain why you can predict the arrival of a train by placing your ear on the rails without seeing

Explain why : sodium can be cut with a knife,

Can you find the mass of sun without weighing?

Can you see the particles of a suspension?

Why can't we see air ?

Explain why graphite is soft and can be used as a lubricant.

Explain why isobars are placed at different places in periodic table?

Explain why can more than 8 electrons not be accommodated in L shell?

The two rails, separated by 1m, of a railway track are connected to a voltmeter. What will be the reading of the voltmeter when a train travels on the rails with speed 5m/s. The earth's magnetic field at the place is 4xx10^(-4)T , and the angle of dip is 30^(º) .

Explain why CoS is more soluble than predicted by the K_(sp) .

Explain why CuS is more soluble than predicted by the K_(sp) .