An evaporating colloidal particle–laden droplet leaves behind a ring-like residue after drying. We routinely observe this ubiquitous phenomenon for dried coffee drops; thus, it is known as the "coffee ...

PDF for Chemistry from the official Rajasthan Board website. Access chapter-wise details for Chemistry with the link to ...

Chirality: like a right hand and a left hand, two molecules can have the same composition, but a different shape and ...

Can you imagine a life-saving molecule whose “twin” is a deadly poison? As surprising as it may seem, this chemical reality is known as “chirality”. Like a right hand and a left hand, two molecules ...