Introduction to Chemistry — CHEMISTRY STD 6 — Question

Green plants need ________________to prepare food.

Aquatic plants and animals use _________ in water.

________ is the purest form of water. It may dissolve gases like ________forming weak acids(sea water/ lake water/rain water ; chlorine/ammonia/carbon dioxide)

Cohesive forces are negligible in ____

__________ is the chemical added to water to remove the tiny suspended particles.

When products of combustion are passed through anhydrous copper sulphate, it turns _______________. [yellow/blue]

The ______ is a layer which extends up to about 10-50 km. above the earth. (troposphere, stratosphere)

Seawater has a high concentration of _______.

_____________ is sometimes called regenerated fibre.

An ………….. is a homogenous mixture of two or more metals, or metals and non-metals.