Which of these techniques are available for isolation and purification of compound?

• A) recrystallization
• B) halogenation
• C) homogination
• D) hexagonation

The reaction that takes place in Daniel cell is

• A)
  Zn/Zn\(^{2+}\)//Cu\(^{2+}\)/Cu
• B)
  Zn/Zn\(^{2+}\)//Cu/Cu\(^{2+}\)
• C)
  Zn\(^{2+}\)/Zn//Cu\(^{2+}\)/Cu
• D)
  Zn\(^{2+}\)/Zn//Cu/Cu\(^{2+}\)

Mortar is NOT used for under water construction because

• A) it hardens by loss of water
• B) its hardening does not depend upon evaporation
• C) it requires concrete to harden
• D) it will be washed away by the flow of water

Separation of mixture of solids by physical methods can be based on differences in the following except

• A. melting point
• B. solubility
• C. particle size
• D. molar mass

The principle of column chromatography is based on the ability of the constituents to

• A) move at different speeds in the column
• B) dissolve in each other in the column
• C) react with the solvent in the column
• D) react with each other in the column

Which of the following compounds is NOT formed by the action of chlorine on methane?

• A) CH₃Cl
• B) C₂H₅Cl
• C) CH₂Cl₂
• D) CH₄Cl

Which of the following results in the fall of acid rain?

• A) Oxides of lead
• B) Particulate matter
• C) Oxides of sulphur
• D) Gaseous hydrocarbon

What is the IUPAC name of CH₃CH₂COOCH₃?

• A. Ethylethanoate
• B. Methylethanoate
• C. Methylpropanoate
• D. Propylmethanoate

Which of the following procedures will separate a mixture of sand, sodium chloride and iodine into its components?

• A) add water; filter; sublime; evaporate to dryness
• B) add water; sublime; filter; evaporate to dryness
• C) sublime; filter; add water; evaporate to dryness
• D) sublime; add water filter; evaporate to dryness

Bees inject an acidic substance when they sting. Which of the following chemical could be used to treat bee stings?

• A. CH₃COOH
• B. NaHCO₃
• C. C₂H₅OH
• D. H₂O₂