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1616. Superphosphate fertilizer is perpared by the reaction between
A. Calcium phosphate and Sulphuric hydroxide
B. Sodium phosphate and Sodium nitrate
C. Magnesium phosphate and Sodium nitrate
D. Sodium sulphate and Phosphoric acid
Explanation:
1617. A super conductor is characterised by
A. zero permeability
B. low permeability
C. high permeability
D. infinite permeability
Explanation:
1618. Consider the following statements about antigens : 1. They induce the formation of antibodies. 2. They provide immunity. 3. They are formed only within the body.Of these statements, the correct ones are
A. 1 and 2
B. 2 and 3
C. 1 and 3
D. 1, 2 and 3
Explanation:
1619. The major ingredient of leather is
A. carbohydrate
B. collagen
C. polymer
D. nucleic acid
Explanation:
1620. In a refrigerator, cooling is produced by
A. the ice which deposits on the freezer
B. the sudden expansion of a compressed gas
C. the evaporation of a volatile liquid
D. None of these
Explanation:
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