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Write the principle behind the froth floatation process. What is the role of collectors in this process?
Concept: Types of Separation or Concentration of an Ore >> Froth Floatation Method
What is meant by the term “chromatography”?
Concept: Refining of Crude Metals
Outline the principles of refining of metals by the following method:
Vapour phase refining
Concept: Refining of Crude Metals
Arrange the set of compounds in order of increasing boiling points.
Bromomethane, Bromoform, Chloromethane, Dibromomethane.
Concept: Physical Properties of Haloalkanes and Haloarenes
What are ambident nucleophiles? Explain with an example.
Concept: Hydrocarbons: Alkanes >> Reactions of Haloalkanes - Nucleophilic Substitution Reactions
Write the structure of the major organic product in the following reaction:
\[\ce{CH3CH2CH2Cl + NaI ->[acetone][heat]}\]
Concept: Methods of Preparation of Haloalkanes
Write the structure of the major organic product in the following reaction:
\[\ce{C6H5ONa + C2H5Cl ->}\]
Concept: Hydrocarbons: Alkanes >> Reactions of Haloalkanes - Reaction with Metals
What happens when ethyl chloride is treated with aqueous KOH?
Concept: Hydrocarbons: Alkanes >> Reactions of Haloalkanes - Nucleophilic Substitution Reactions
How the following conversion can be carried out?
Ethyl chloride to propanoic acid.
Concept: Hydrocarbons: Alkanes >> Reactions of Haloalkanes - Nucleophilic Substitution Reactions
C–Cl bond length in chlorobenzene is shorter than C–Cl bond length in CH3–Cl.
Concept: Hydrocarbons: Alkanes >> Reactions of Haloalkanes - Nucleophilic Substitution Reactions
SN1 reactions are accompanied by racemization in optically active alkyl halides.
Concept: Hydrocarbons: Alkanes >> Reactions of Haloalkanes - Nucleophilic Substitution Reactions
What happens when
(i) PCl5 is heated ? Write the reactions involved.
Concept: Group 17 Elements - The Halogen Family >> Chlorine
Explain the mechanism of the following reaction:
Concept: Preparation of Ethers
How will you convert: Propene to Propan-2-ol?
Concept: Methods of Preparation of Alcohols
Account for the following: Fluorine does not exhibit positive oxidation state.
Concept: Group 17 Elements - The Halogen Family
Account for the following: Oxygen shows catenation behavior less than sulphur.
Concept: Group 16 Elements - The Oxygen Family
Pb(NO3)2 on heating gives a brown gas which undergoes dimerisation on cooling? Identify the gas
Concept: Group 15 Elements - The Nitrogen Family >> Oxides of Nitrogen
Draw the structures of the following molecules: (HPO3)3
Concept: Group 15 Elements - The Nitrogen Family >> Compounds of Phosphorus
What happens when: SO2 gas is passed through an aqueous solution Fe+3 salt?
Concept: Group 16 Elements - The Oxygen Family >> Sulphur Dioxide
Write the final product(s) in each of the following reactions:
Concept: Chemical Reactions of Alcohols and Phenols >> Reactions Involving Cleavage of Carbon–Oxygen (C–O) Bond in Alcohols
