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__________ are used as corrosion inhibitor for iron & steel in aqueous solutions.

A. Phosphates

B. Chromates

C. Sulphates

D. Bi-carbonates

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  20. Salt cake is chemically represented by
  21. Teflon is
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  23. Penicillin is separated from fermented broth by
  24. Chloramines are used in water treatment for
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