Chemistry - Study Mode

[#836] An alloy used in making heating elements for electric heating device is
Correct Answer

(C) Nichrome

Explanation

Solution: An alloy used in making heating elements for electric heating devices is nichrome. It is an alloy of nickel, chromium, (and sometimes iron and other elements or substances). It is used as resistance wire.

[#837] Which of the following is an iron ore ?
Correct Answer

(B) Magnetite

Explanation

Solution: Magnetite is an iron ore.

[#838] The important metal used with iron to produce stainless steel is
Correct Answer

(B) Chromium

Explanation

Solution: Stainless steels are iron alloys with a minimum of 10.5% chromium. Other alloying elements are added to enhance their structure and properties such as formability, strength and cryogenic toughness. These include metals such as: Nickel.

[#839] Which of the following metals form an amalgam with other metals ?
Correct Answer

(D) Mercury

Explanation

Solution: Mercury form an amalgam with other metals.

[#840] ________ gives hardness to stainless steel.
Correct Answer

(C) Carbon

Explanation

Solution: Iron is alloyed with carbon lo make steel and has the effect of increasing the hardness and strength of iron. Pure iron cannot be hardened or strengthened by heat treatment but the addition of carbon enables a wide range of hardness and strength. High-carbon stainless steel contains a minimum of 0.3% carbon. The higher the carbon content, the less formable and the tougher the steel becomes.