Chemistry - Study Mode

[#46] Table salt gets moist during rainy season because
Correct Answer

(D) Sodium chloride contains hygroscopic impurities like magnesium chloride

Explanation

Solution: Table salt is refined salt, which contains about 97 to 99 percent sodium chloride. It usually contains substances that make it free-flowing (anticaking agents) such as sodium aluminosilicate or magnesium carbonate. Because of Hygroscopic nature of salt it become wet in rainy season as the salt absorbs moisture from environment.

[#47] The unit to measure the flow of water is
Correct Answer

(D) Cusecs

Explanation

Solution: The unit to measure the flow of water is cusecs. Cusecs is short form of Cubic feet per second.

[#48] When water itself combines chemically with some element or mineral it is called
Correct Answer

(C) Hydration

Explanation

Solution: When water itself combines chemically with some element or mineral it is called hydration.

[#49] Sea water is saltier than rain water because
Correct Answer

(C) Rivers wash away salts from earth and pour them into the sea

Explanation

Solution: Sea water is saltier than rain water because river wash away salts from earth and pour them into the sea. Rain water is mostly pure water. Sea water has salt (and other minerals) dissolved in it. Water evaporates from the sea to form clouds (which eventually cause rain) - but the salt is left behind in the ocean. Thus, you can't have salt-water rain.

[#50] Sea water can be purified by the process of
Correct Answer

(A) Distillation

Explanation

Solution: Desalination – is a process by which saline water (generally sea water) is converted to fresh water. The most common desalination processes are distillation and reverse osmosis.