Question 21 : Dehydrogenation of isopropanol produces
1. acetone
2. propyl alcohol
3. formaldehyde
4. trichloroethylene
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Question 22 : Most commonly used rubber vulcanising agent is
1. sulphur
2. platinum
3. alumina
4. bromine
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Question 23 : The type of high refractive index glass used in optical instruments is __________ glass.
1. flint
2. pyrex
3. none of these
4. crookes
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Question 24 : Free alkali in a toilet soap is __________ that in a laundary shop.
1. more than
2. less than
3. same
4. none of these
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Question 25 : Oxidation of ortho-xylene in presence of __________ catalyst is done to produce phthalic anhydride on commercial scale.
1. nickel
2. vanadium
3. iron
4. alumina
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Question 26 : Cumene is the starting material for the production of
1. isoprene
2. phenol and acetone
3. benzoic acid
4. styrene
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Question 27 : Glycerine is not used in the
1. manufacture of pharmaceuticals.
2. none of these.
3. conditioning and humidification of tobacco.
4. manufacture of explosive.
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Question 28 : Styrene butadiene rubber (SBR) is
1. a synthetic monomer.
2. a synthetic polymer.
3. a natural rubber.
4. another name of silicone rubber.
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Question 29 : Raw materials used for producing __________ cement does not contain iron oxide.
1. slag
2. white
3. waterproof
4. pozzolan
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Question 30 : Polycaprolactum is commercially known as
1. nylon-66
2. dacron
3. nylon-6
4. rayon
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