Dust generally settles down in a closed room. Why?

Liquids generally have lower density as compared to solids. But you must have oberved that ice floats on water. Find out why.

A refrigator with its power on , is kept in a closed room with its door open . The temperature of the room will

The reaction, Cr_2O_3 + 2Al rarr Al_2O_3 + 2Cr (DeltaG^@ = -421KJ) is thermodynamically feasible as is apparent from the Gibbs energy value. Why does it not take place at room temperature?

What is step up and step down transformer? To transfer electric energy from generating station initially step up transformer is used. Why?

Why does the inner side of a window pane in a room sweat in cold weather?

Write why aldehydes are generally more re-active than ketones in nucleo philic addition reactions.

Heat is generated continuosly in an electric heater ,but its temperature becomes constant after some time.Why?

Why is an insulator sometimes called a dielectric? What is the main difference between free and bound charge? Generally one of the two plates of a Capacitor System is earthed, why? Derive the expression for the energy stored in a charged capacitor.