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Q.

Which of the following cuts ultraviolet rays?


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a

Soda glass

b

Crookes glass

c

Pyrex

d

None of these 

answer is B.

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Detailed Solution

concept - Glass is a non-crystalline amorphous solid and inorganic material that is generally hard, brittle and transparent. Soda glass, Crooked glass, and pyrex are all types of glasses.
Soda glass or soda-lime-silica glass consists of about 70 per cent silica or silicon dioxide, 15 per cent soda ash or sodium oxide, 9 per cent lime or calcium oxide, and minor amounts of some other compounds. It is cheap, hard, and can be softened several times. Due to these properties, soda ash glass is used to make bottles, light bulbs, etc. However, it does not contain any component capable of absorbing UV radiation. So, option A is not correct.
Crooked glass is a type of glass that contains mainly cerium oxide and silicon dioxide. Cerium oxide can sharply absorb harmful UV rays from the sun. It is therefore used in the manufacture of sunglasses. So, option B is correct.
Pyrex glass is a type of borosilicate glass that consists of barium silicate and sodium silicate. It has a very high chemical resistance, which is why it is used in the manufacture of laboratory equipment. However, none of its components has the ability to cut off UV radiation. So option C is incorrect.
Hence, the correct answer is 2.
 
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Which of the following cuts ultraviolet rays?