IOC LAB: exam questions

avatar
Created by
kaisquare

Subdecks (2)

Cards (53)

  • Sodium Bromide formed during the preparation of Lassaigne’s extracts reacts with Silver Nitrate to form a pale yellow precipitate of silver bromide which is sparingly soluble in NH3OH.
  • An amine is generally a functional group with a nitrogen atom having a lone pair
  • The acid solution should be made neutral before performing the test with Ferric Chloride solution by adding a 5% Sodium Carbonate solution gradually to 5.0 ml of ferric chloride until a faint precipitate of ferric hydroxide is produced.
  • A halogen is unstable and must be prepared in the reaction solution by mixing AgNO3 with acid
  • Primary ammonia Amines form stable ammonium salts at zero degrees.
  • The 2,4-dinitrophenylhydrazine (DNPH) test is a test for the presence of aldehydes and ketones.
  • The reaction of Acetic Acid with Sodium Carbonate (Na2CO3 ) produce effervescence due to liberation of carbon gas atoms.
  • Bromine imparts orange color and Iodine imparts violet color in carbon disulphide layer Insoluble acids dissolve in both NaOH and NaHCO3 solution
  • Formic acid or methanoic acid is the simplest aliphatic acid.
  • Yellow-white precipitate is the visual evidence when ketone was added using iodoform test.
  • The solution will be clear or transparent in color when phenolphthalein was added to stearic acid.
  • Amines are widely used in developing chemicals for crop protection, medical and purification.
  • Ammonium gas is a compound of nitrogen and hydrogen, it is a colorless gas with a distinct pungent smell.
  • The formation of a sweet-smelling compound indicates the presence of esters group in the given organic compound.
  • Sodium cyanide is converted to sodium ferrocyanide on treatment with ferrous sulphate.
  • The formation of a purple ring is seen as a visual evidence when carbohydrates are added to molisch reagent.
  • The iodine test which involves the reaction of Iodine with ketones, typically results in yellow color.
  • Schiff's test will give a positive test result for aldehydes.
  • A test for phenolic group is the litmus test.