21. Pentane and 2-methyl butane have the same
A. Boiling point
B. Melting point
C. Percentage composition
D. Structural formula
✅ The correct answer is option C.
Chemistry
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22. The important monomers of acrylic resins are
A. Vinyl chloride
B. Styrene
C. Methylmethacrylate
D. Hexamethylenediamine
✅ The correct answer is option C.
23. The type of filtering media used for filtration depending upon
A. Nature of reactants
B. Nature of crucible
C. Nature of product
D. Nature of precipitate
✅ The correct answer is option D.
24. Organic compounds that are essentially nonpolar and exhibit weak intermolecular forces have
A. Low melting points
B. Low vapour pressure
C. High boiling points
D. High electrical conductivity
✅ The correct answer is option A.
25. Polyester resins are the product of the reaction of
A. Dihydric alcohol and dicarboxylic aromatic acids
B. Polyamines with aliphatic dicarboxylic acids
C. Styrene in the presence of a catalyst
D. Epichlorohydrin with diphenol propane
✅ The correct answer is option A.
26. A safe and more reliable method for drying the crystal is
A. Hot air currents
B. folds of filter paper
C. oven
D. Vacuum desiccator
✅ The correct answer is option D.
27. The first organic compound was synthesized in laboratory by
A. Wohler
B. Kolbe
C. Berzelius
D. Berthelot
✅ The correct answer is option A.
28. Industrial materials and thermal power stations are coated with
A. Polyester resins
B. Epoxy paints
C. Polyamide resins
D. Polyvinyl chloride
✅ The correct answer is option B.
29. According to vital force theory
A. Organic compounds can be synthesized from inorganic compounds
B. organic compounds cannot be synthesized from inorganic compounds
C. organic compounds can be synthesized by animals
D. organic compounds can be synthesized by plants
✅ The correct answer is option A.
30. Carbohydrates are polyhydroxy compounds of
A. Glucose
B. Glyceraldehydes
C. Oligosaccharides
D. Aldehydes and ketones
✅ The correct answer is option D.