The substance which is added to glass to increase its hardness?

The substance which is added to glass to
increase its hardness?
by

1 Answer

Answer :

Borax
by

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Give reasons : (a) Window glass of old building look milky. b) Window glass of old building is thick at bottom. (c) CaCl2 will introduce Schottky defect if added to AgCl crystal.

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Last Answer : (a) Due to annealing over a number of years glass acquires some crystalline character. (b) Glass is not a true solid. But a super-cooled liquid of high viscosity. It has the property to ... to maintain electrical neutrality. Thus a hole is created and lattice site for every Ca2+ ion introduced. 

Ice cubes are added to a glass of pure water and a glass of pure alcohol. The ice would be (1) at a higher level in water (2) at a higher level in alcohol (3) at the same level in both (4) floating in alcohol and sinking in water

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Substance used to give violet colour to glass?

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Last Answer : Manganese dioxide

The substance used in glass to get blue colour?

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Last Answer : Cobalt salt

Why is glass a cheap substance?

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Last Answer : The raw materials used in manufacture of glass are cheap and available in most of the geographical areas. It does not require sophisticated technology to manufacture.

Adding which substance gives blue colour to glass? (1) Manganese oxide (2) Cobalt oxide (3) Chromium oxide (4) Iron oxide

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Last Answer : (2) Cobalt oxide Explanation: Cobalt is the strongest of the coloring oxides, giving a range of blues in most glasses. It is such a powerful colorant that only a few parts per million is needed to produce a light blue color such as the shade used for certain bottled waters.

A substance which reacts with oxygen giving heat is called a combustible substance. Which one of the following is a combustible substance? a) iron nail b)glass c)stone piece d)wood

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Tetraethyl lead (TEL) is added to petrol to (a) prevent its freezing (b) increase its boiling point (c) increase its flash point (d) increase its anti-knocking rating

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What is the effect of adding a capacitor in series with an antenna? A. The antenna’s resonant frequency will increase B. The antenna’s resonant frequency will decrease C. The antenna will be physically 5% longer than its electrical length D. A capacitor is never added in series with an antenna

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Last Answer : A. The antenna’s resonant frequency will increase

Peptizers like aromatic mercaptans (e.g. thiophenes) are added in rubber to (A) Protect rubber goods from attack by oxygen & ozone present in the atmosphere (B) Reduce its viscosity to permit easier processing (C) Reduce the time of vulcanisation and quantity of vulcanising agent (D) Increase its viscosity

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Last Answer : (B) Reduce its viscosity to permit easier processing

Mercaptans are added to liquefied petroleum gas (LPG) to (A) Reduce its cost (B) Narrow down its explosion limit (C) Assist in checking its leakage from cylinder (D) Increase its calorific value

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Last Answer : (C) Assist in checking its leakage from cylinder

Phenols are added in gasoline to (A) Improve the octane number(B) Act as an antioxidant(C) Reduce its viscosity(D) Increase its pour point

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Last Answer : (B) Act as an antioxidant

Tetraethyl lead is added to the petrol to increase its octane number, because its octane number is (A) More than 100 (B) Round about 100 (C) Between 50 and 100 (D) Less than 25

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Last Answer : (A) More than 100

Tetra-ethyl lead is added in gasoline to (A) Increase its smoke point (B) Reduce gum formation(C) Reduce the pour point(D) Increase its octane numbe

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Conditioners like finely divided peat are added to the fertiliser to (A) Counteract burning (B) Avoid caking & hardening (C) Produce bulk (D) Increase its solubility

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Last Answer : (B) Avoid caking & hardening

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Last Answer : (C) Reduce the variation in its viscosity with temperature