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⁞ Chemistry

General Science ➤ Chemistry ➤ 2
Question 21
Q21.  What do we call the polymer which is formed from more than one kind of monomer?
 

Answer :  Copolymer


A polymer formed from more than one kind of monomer units is called copolymer or mixed polymer. A polymer formed from only one kind of monomers is called homopolymer.
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Question 22
Q22.  Which of these is a condensation polymer of ethylene glycol and terphthallic acid?
 

Answer :  Terylene


Terylene is a condensation polymer of ethylene glycol and terphthallic acid. In condensation polymerisation, monomers combine with the elimination of a small molecule like H2O.
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Question 23
Q23.  Which is the most abundant metal in the human body?
 

Answer :  Calcium


Calcium is the most abundant metal in the human body. It is also the 5th most abundant metal in the earth’s crust.
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Question 24
Q24.  What is the common name of Ca(ClO)2?
 

Answer :  Bleaching Powder


Calcium hypochlorite is an inorganic compound with formula Ca(ClO)2. It is the main active ingredient of commercial products called bleaching powder, chlorine powder, or chlorinated lime, used for water treatment and as a bleaching agents.
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Question 25
Q25.  Which disease is caused by Nickel?
 

Answer :  Dermatitis


Nickel allergy is a common cause of allergic contact dermatitis — an itchy rash that appears where your skin touches a usually harmless substance. Nickel allergy is often associated with earrings and other jewelry. But nickel can be found in many everyday items, such as coins, zippers, cellphones and eyeglass frames.
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