1.

For avoiding the reduction of the residual hardness, incomplete precipitation and slow reaction, The reaction is carried out at __________ temperature.(a) 30-40^oC(b) 40-50^oC(c) 50-60^oC(d) 60-70^oCI got this question during an interview.My question is taken from Lime Washing Soda Method topic in division Water of Applied Chemistry

Answer»

Right option is (C) 50-60^oC

Explanation: For AVOIDING the REDUCTION of the residual HARDNESS, INCOMPLETE precipitation and slow reaction, The reaction is carried out at 50-60^oC temperature.



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