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Which of the following polymers are thermoplastic?
(i) Teflon
(ii) Natural rubber
(iii) Neoprene
(iv) Polystyrene
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Which of the following polymers are used as fibre?
(i) Polytetrafluoroethane
(ii) Polychloroprene
(iii) Nylon
(iv) Terylene
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Why are rubbers called elastomers?
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Amongst the following antihistamines, which are antacids?
(i) Ranitidine
(ii) Brompheniramine
(iii) Terfenadine
(iv) Cimetidine
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Both antacids and antiallergic drugs are antihistamines but they cannot replace each other. Explain why?
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What are the functions performed by histamine in the body?
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Assertion: Penicillin (G) is an antihistamine.
Reason: Penicillin (G) is effective against gram-positive as well as gram-negative bacteria.
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Account for the following:
Aniline cannot be prepared by the ammonolysis of chlorobenzene under normal conditions.
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The major product of acid catalysed dehydration of 1-methylcyclohexanol is ______.
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Write the expression of integrated rate equation for zero order reaction.
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A compound 'A' on reduction with iron scrap and hydrochloric acid gives compound 'B' with molecular formula C6H7N. Compound 'B' on reaction with CHCl3 and alcoholic KOH produces an obnoxious smell of carbylamine due to the formation of 'C'. Identify 'A', 'B' and 'C' and write the chemical reactions involved.
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Give reasons for the following:
Ammonolysis of alkyl halides is not a good method to prepare pure primary amines.
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The slope in the plot of [R] Vs. time for a zero-order reaction is ______.
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Which of the following would not be a good choice for reducing nitrobenzene to aniline?
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The following experimental rate data were obtained for a reaction carried out at 25°C:
\[\ce{A_{(g)} + B_{(g)} -> C_{(g)} + A_{(g)}}\]
| Initial [A(g)]/mol dm−3 | Initial [B(g)]/mol dm−3 | Initial rate/mol dm−3s−1 |
| 3.0 × 10−2 | 2.0 × 10−2 | 1.89 × 10−4 |
| 3.0 × 10−2 | 4.0 × 10−2 | 1.89 × 10−4 |
| 6.0 × 10−2 | 4.0 × 10−2 | 7.56 × 10−4 |
What are the orders with respect to A(g) and B(g)?
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Assertion (A): For a zero-order reaction, the unit of rate constant and rate of reaction are same.
Reason (R): Rate of reaction for zero order reaction is independent of concentration of reactant.
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Why is the boiling point of aldehydes and ketones lower than that of corresponding carboxylic acids?
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Give a chemical test to distinguish between ethanal acid and ethanoic acid.
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Amides can be converted into amines by the reaction named ______.
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