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The major ingredient of leather is

A. Nucleic acid

B. Carbohydrate

C. Collagen

D. Polymer

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  2. One fathom is equal to
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  20. When a gas is turned into a liquid, the process is called
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  22. Quartz crystals normally used in quartz clocks etc. is chemically
  23. According to Daltons atomic theory the smallest particle which can exist independently is
  24. Glass is made from the mixture of
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  28. Carbon tetrachloride fire extinguisher should not be used in closed room because it produces poisonous…
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  30. Rust is