Chemistry - Study Mode

[#426] Milk tastes sour when it is left in open for some time. This happens due to the formation of
Correct Answer

(A) Lactic acid

Explanation

Solution: Like many other things, milk contains bacteria, Milk also naturally contains a kind of sugar known as “lactose.” The bacteria that live in milk get energy from this special sugar and use it to reproduce to make even more bacteria. When the bacteria use the lactose sugars to reproduce, they change it from “lactose sugar” into “lactic acid,” which tastes sour.

[#427] The compound used in prickly heat powder to prevent excessive sweating is
Correct Answer

(A) Boric acid

Explanation

Solution: The compound used in prickly-heat powder to prevent excessive sweating is Boric acid.

[#428] The alkaloid naturally found in coffee, cocoa and cola nut is
Correct Answer

(D) Caffeine

Explanation

Solution: Caffeine (C 8 H 10 N 4 O 2 ) is a bitter alkaloid found especially in coffee, tea, cacao, and kola nuts.

[#429] Formic acid is produced by
Correct Answer

(C) Red ants

Explanation

Solution: Formic acid was first isolated from certain ants and was named after the Latin formica, meaning “ant.” It is made by the action of sulfuric acid upon sodium formate, which is produced from carbon monoxide and sodium hydroxide.

[#430] Which one of the following is most acidic?
Correct Answer

(A) Al 2 O 3

Explanation

Solution: Al 2 O 3 is most acidic.