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41
Use of water having dissolved oxygen in boilers promotes
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Answer: Option A
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42
Chrome tanning and vegetable tanning are done for
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Answer: Option A
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43
Refractory bricks burnt at very high temperature have got
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Answer: Option A
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44
Viscose rayon . . . . . . . .
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Answer: Option B
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45
Viscose rayon is
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Answer: Option D
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46
Viscose rayon is chemically
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Answer: Option D
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47
Vulcanisation of rubber
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Answer: Option D
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48
The biochemical treatment applied to sewage effluents is a process of
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Answer: Option C
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49
Washing of coal is done to
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Answer: Option D
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50
Wax is a
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Answer: Option B
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