Chemistry PUC II year Practical Viva questions ( Most important)
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1)N a test to detect an alcoholic-OH group.
Ans: Ceric ammonium nitrate test.
2)M one reagent used to test alcohol.
Ans: Lucas reagent or Ceric ammonium nitrate.
3) Whappens when ceric ammonium nitrate is added to alcohol?
Ans: Pink or red colour is obt,iined.
4) Which organic compound is identified by using ceric ammonium nitrate?
Ans: Alcohol.
5)What colour is seen when ceric ammonium nitrate is added to alcohol? Ans: Pink or red colour.
6. What is Lucas reagent?
Ans: A mixture of anhydrous ZnCI, & conc. HCI is called Lucas reagent.
7. Name the reagent used to distinguish between primary, secondary & tertiary alcohols.
Ans: Lucas reagent test.
8. What happens when primary alcohol is treated with Lucas reagent? Ans: White turbidity appears only on heating.
9. What happens when secondary alcohol is treated with Lucas reagent? Ans: White turbidity appears after 5-10 minutes.
10. What happens when tertiary alcohol is treated with Lucas reagent? Ans: White turbidity appears immediately.
11. Which alcohol immediately forms turbidity with Lucas reagent? Ans: Tertiary alcohol.
12. Which alcohol forms turbidity with Lucas reagent after 5 minutes? Ans: Secondary alcohol.
13. Which alcohol do not form turbidity when treated with Lucas reagent at room temperature?
Ans: Primary alcohol.
14. Which organic compound gives violet colur with neutral FeCI3 solution?
Ans: Phenol. 15.
How do you detect phenol?
Ans: Neutral FeCI3 test or phthalein fusion test is used to detect phenol.
16. Which organic compound anwers phthalein fusion test?
Ans: Phenol.
17.Name the product obtained in phthalein fusion test.
Ans: Phenophthalein.
18. Mention the reagents used in phthalein fusion test.
Ans: Phenol + phthaleic anhydride + conc. H2S0.4
19. Which colour is obtained when phenol undergoes phthalein fusion test?
Ans: Pale pink colour.
20. What for is 2,4-DNPH reagent used?
Ans: 2,4-DNPH is used to detect carbonyl group (aldehyde or ketone).
21. Which organic compound/functional group is identified in 2,4-DNPH test? A :Aldehyde or ketones (carbonyl group).
22. What happens when an aldehyde or a ketone is heated with 2,4-DNPH? Ans: Crystalline orange precipitate is formed.
23. Mention one test for aldehyde. Ans: 2,4-DNPH test or Toilet's reagent test.
24. What is Tolien's reagent test?
Ans: Toilet's reagent test is used to detect aldehyde. A silver mirror is obtained when an aldehyde is heated with Toilet's reagent.
25. Which organic compound gives a silver mirror when heated with Tolien's reagent?
Ans: Aldehyde.
26. What is esterification test?
Ans:It is a confirmatory test for carboxylic acids & alcohols. When a carboxylic acid is heated with an alcohol in presence of conc. H2SO4, an ester having fruity smell is formed.
27. Which organic compound answers esterification test?
Ans: Carboxylic acid or alcohol.
28. Mention one simple test to identify a carboxylic acid.
Ans: Sodium bicarbonate test or litmus paper test.
29. What happens when a carboxylic acid is treated with NaHCO3 solutic 7 Ans: Brisk effervescence takes place with the liberation of CO2 gas.
30. Which organic compound answers carbylamine test?
Ans: Primary amines.
31. How do you perform carbylamine test?
Ans: Primary amine on heating with chloroform & alcoholic KOH or NaOH gives carbylamine (isocyanides) having foul smell.
32. What happens when a primary amine is heated with chloroform & alc.KOH solution?
Ans: Carbylamine is obtained.
33. Explain Azo dye test.
Ans: Azo dye test is used to detect aromatic primary amine. When aromatic primary amine is treated with dilute HCI, sodium nitrite & 13-naphthol in NaOH ,n at 0-5° C gives orange red dye.
34. What colour is seen in Azo dye test?
Ans: Orange red.
35. Which organic compound answers Azo dye test?
Ans: Aromatic primary amine.
36. What is Tollen's reagent?
Ans: Ammoniacal silver nitrate (AgNO3) is called Toilet's reagent.
37. What is Litmus paper test?
Ans: It is used to detect carboxylic acid. A carboxylic acid turns blue litmus paper into red.
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