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  1. Because of lanthanoid contraction,which of the following pairs of elements
  2. Biochemical oxygen Demand ,(BOD) is a measure of organic material present in water
  3. The process associated with sodium carbonate manufacture is known as….process
  4. The pH of solution containing 0.10 M sodium acetate and 0.03 M acetic acid is
  5. Which one of the following esters gets hydrolysde most easily under alkaline