Question

A metalloid used to make glass
A) Sulphur
B) Germanium
C) Silicon
D) Antimony

Answer 1

Hint: “None of the above'' applies to certain elements. Because of their features, they don't easily fall into the metal or nonmetal groups. A metalloid is a substance with properties that fall somewhere between metals and nonmetals. Semimetals are another name for metalloids. Metalloids are elements that are yellow in colour and usually border the stair-step line on the periodic table.

Complete answer: Boron, silicon, germanium, arsenic, antimony, and tellurium are the six widely recognised metalloids. Carbon, aluminium, selenium, polonium, and astatine are five of the less commonly classified elements. All eleven elements are found in a diagonal region of the p-block extending from boron at the upper left to astatine at the lower right on a regular periodic table.
Metalloids have a metallic look, but they are brittle and just good electrical conductors. Chemically, they mostly behave like nonmetals. They can combine metals to form alloys. The majority of their other physical and chemical properties are intermediate. Metalloids are usually too fragile to be used in structural applications. Alloys, biological agents, catalysts, flame retardants, glasses, optical storage and optoelectronics, pyrotechnics, semiconductors, and electronics all use them and their compounds.
Antimony is the metalloid which is used to make glasses.
Antimony oxide is a white powder derived from the mineral stibnite (antimony sulphide) or formed by the oxidation of antimony metal or as a by-product of antimonial-lead alloy refining. It acts as a metal at times and as a non-metal at other times. Tiny percentages of antimony oxide are used in the glass industry to eliminate bubbles in optical glass, to decolorize specialty glasses, and to stabilise emerald green glass. In higher temperature glazes, it is slightly fluxing.
The correct option is D.

Note:
Antimony is sometimes used in conjunction with rutile or titanium as a yellow body dye. Antimony is used in the brick industry to bleach the surface of red-burning clay to achieve variegated coloration.