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841. Washing soda is the common name for :
A. Calcium carbonate
B. Calcium bicarbonate
C. Sodium carbonate
D. Sodium bicarbonate
Explanation:
842. Which of the following statements is/are ture ? 1. The process of oxidation leads to a gain of electrons2. The process of oxidation leads to a loss of electrons3. The process of reduction leads to a gain of electrons4. The process of reduction leads to a loss of electrons.
A. 1 only
B. 1 and 4
C. 2 and 3
D. 4 only
Explanation:
843. Which synthetic fibre is known as artifical silk ?
A. Cotton
B. Rayon
C. Terylene
D. Nylon
Explanation:
844. The gas which had leaked out of Union Carbide factory in Bohopal was :
A. sulphur dioxide
B. methyl cyanide
C. carbon monoxide
D. methyl isocynate
Explanation:
845. The quantum theory was first enunciated by :
A. Niel Bohr
B. Albert Einstein
C. Max Planck
D. Max Born
Explanation:
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