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NEET UG Principles Related to Practical Chemistry — practice questions — page 4

Explore 97 free Principles Related to Practical Chemistry questions in NEET UG Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Principles Related to Practical Chemistry questions and exercises with answers

Showing questions 91–97 of 97.

After a Tollens' test, the silver mirror is removed by adding:Read the answer and worked solution →What is seen when a carboxylic acid is added to sodium hydrogencarbonate solution?Read the answer and worked solution →A carboxylic acid warmed with ethanol and conc. H2SO4 gives a sweet smell due to:Read the answer and worked solution →Which amines give the carbylamine test with chloroform and alcoholic KOH?Read the answer and worked solution →How is the toxic carbylamine destroyed after the test?Read the answer and worked solution →In the azo dye test, benzenediazonium chloride couples with beta-naphthol to give:Read the answer and worked solution →At what temperature is aniline diazotised in the azo dye test?Read the answer and worked solution →

Worked practice questions

After a Tollens' test, the silver mirror is removed by adding:

  1. Sodium hydroxide
  2. Conc. hydrochloric acid
  3. Dilute nitric acid
  4. Ammonium hydroxide
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Correct answer: C. Dilute nitric acid

Dilute nitric acid dissolves metallic silver as silver nitrate.

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What is seen when a carboxylic acid is added to sodium hydrogencarbonate solution?

  1. A violet colour
  2. Brisk effervescence
  3. A silver mirror
  4. No visible change
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Correct answer: B. Brisk effervescence

Carboxylic acids are strong enough to release carbon dioxide from hydrogencarbonate.

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A carboxylic acid warmed with ethanol and conc. H2SO4 gives a sweet smell due to:

  1. An ether
  2. An ester
  3. An aldehyde
  4. An alkene
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Correct answer: B. An ester

Acid catalysed esterification of the carboxylic acid with ethanol produces a sweet smelling ester.

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More Chemistry topics

Amines and BiomoleculesChemical KineticsAldehydes, Ketones and Carboxylic AcidsEquilibriumRedox ReactionsHydrocarbonsChemical Bonding and Molecular StructureSolutions