Chemistry - Study Mode

[#1] Stains of rust on clothes can be removed by :
Correct Answer

(A) Oxalic acid

Explanation

Solution: Rust stains can be a challenge to remove because the stain consists of tiny iron oxide particles. Acidic solutions work best for these stains. The important ingredient in these removers is an acid - usually oxalic or hydrofluoric acid. The remover ingredients combine with the iron and loosen it from the fabric, then hold it in suspension in the wash water.

[#2] One of the constituents of tear gas is
Correct Answer

(D) Chloropicrin

Explanation

Solution: Chloropicrin is a colourless liquid that is insoluble in water, with which it is stable. With a vapor pressure of 24 mm Hg, its volatility is between that of phosgene and mustard gas in persistency, although closer to phosgene because it is related to the compound. Tests have shown that chloropicrin causes humans to shut their eyes involuntarily. Chloropicrin can be absorbed systemically through inhalation, ingestion, and the
skin. It is severely irritating to the lungs, eyes, and skin. Because of these properties, chloropicrin can only be delivered in shell form as a chemical weapon. Chloropicrin, today, is used as a fumigant to control pests found in the soil. Although less common, it can be used as a poison for vertebrates, such as rabbits. Chloropicrin is commonly used in combination with other fumigants, such as methyl bromide and sulfuryl fluoride, for increased potency and as a warning agent

[#3] The element used for making solar cells is
Correct Answer

(D) Silicon

Explanation

Solution: Because of its unique internal atomic structure and its ready availability, silicon is widely used for solar cells. One of the elements of the Periodic Table of the Elements, silicon is known as a semiconductor, a substance that conducts electricity when there is a change to its environment.

[#4] DDT and BHC may act as
Correct Answer

(B) Carcinogens

Explanation

Solution: DDT and BHC are hydrocarbons that may be carcinogenic. Laboratory animal studies showed effects on the liver and reproduction. DDT is considered a possible human carcinogen

[#5] Gunpowder consists of a mixture of
Correct Answer

(C) Nitre, sulphur and charcoal

Explanation

Solution: Gunpowder consists of a mixture of Nitre, sulphur and charcoal.