Practice MCQ Questions and answers on Chemistry-GK

Superphosphate is not a nitrogenous fetiliser.

Most of soda's acidity also comes from phosphoric acid. Phosphoric acid is made from the mineral phosphorus, which is found naturally in the body. Phosphoric acid gives soft drinks a tangy flavor and prevents the growth of mold and bacteria.

Pyrethrin is a natural plant derived substance that comes from the chrysanthemum cinerariaefolium.

Lacrimal gland, located under the upper eyelid at the outer cornea of the eye, is responsible for tearing during emotional stimulation or following corneal irritation by a foreign body or chemical substance. Tear gas, also called lacrimator, refers to any of a group of substances that irritate the mucous membranes of the eyes, causing a stinging sensation and tears. It produces severe lacrimation by irritating the conjunctivae.

A solar cell (also called a photovoltaic cell) is an electrical device that converts the energy of light directly into electricity by the photovoltaic effect. Materials presently used for photovoltaic solar cells include mono-crystalline silicon, polycrystalline silicon, amorphous silicon, cadmium telluride, and copper indium selenide/sulfide.

Edible salt can be iodised by spraying it with a potassium iodate or potassium iodide solution.

Mortar is a workable paste used to bind building blocks such as bricks units to fill and seal the gaps. It is a mix of sand, a binder and water.

Mercury vapour and argon are the most commonly used substance in fluorescent tubes.

Tear gas is Carbonyl chloride.

Tetra ethyle lead (TEL) is an antiknock compound.