Chemistry - Study Mode

[#611] The acid which is secreted by the glands in the stomach wall is
Correct Answer

(B) Hydrochloric acid

Explanation

Solution: Our stomachs have special glands in their walls. These glands produce an acid to help us digest food. The acid is not Sulphuric acid, Nitric acid, or Phosphoric acid. The correct answer is Hydrochloric acid. Hydrochloric acid is a strong acid that helps break down food in the stomach.

[#612] Hydrochloric acid is also known as
Correct Answer

(C) Muriatic acid

Explanation

Solution: Hydrochloric acid is also known as Muriatic acid.

[#613] Heating of a ore below its melting point in the absence of air is known as
Correct Answer

(B) Calcination

Explanation

Solution: Calcination is the process in which the ore is heated below its melting point in absence of air.

[#614] Stainless steel is usually made by alloying the steel with
Correct Answer

(C) Chromium and nickel

Explanation

Solution: Stainless steel is usually made by alloying the steel with chromium and nickel.

[#615] The element used in the manufacture of safety matches is
Correct Answer

(A) Phosphorous

Explanation

Solution: One end of a match is coated with a material that can be ignited by frictional heat generated by striking the match against a suitable surface. The coated end of a match, known as the match "head," contains either phosphorus or phosphorus sesquisulfide as the active ingredient and gelatin as a binder.