Why there is a cool sensation after bathing?

Why does leather get hardened after tanning?

Explain why it is harmful to bathe in heavy water and use it for drinking purposes.

Why does a dry cell becomes dead after a long time even if it has not been used?

Explain why the water obtained after passing hard water through cation exchange resins is acidic.

Some flowers open after sunrise and close after sunset. This is-

A centigrade and a Fahrenheit thermometer are dipped in boiling water. Now this water is cooled and the reading on the Fahrenheit scale 140^(@)F . The decrease in temperature on the Centrigrade thermometer is-

Two vessels are filled with water at the same temperature. If one vessel is heated and the other is cooled, then in both the cases water overflows. The initial temperature of water in both the vessels was

TCA cycle is named after

Why do we see the sun sometime before sunrise and sometime after sunset?