Write the name and formula of the first member of the carbon compounds having functional group-COOH.

Why is emergent ray parallel to the incident ray, after the refraction of Incident ray through a glass slab?

When boilers of water are used for a very long time, then white layers get deposited on inside of these boilers? How can these white layers be removed?

State one function of pupil in human eye.

State one harmful effect of depletion of ozone layer on the living organisms of the ecosystem.