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Q.

Which is a part of :green Chemistry”?

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a

Using ‘Triple phosphate of lime’ in place of ‘super phosphate of lime

b

Using UPS at times of power cuts

c

Replacing manual weeding by weedicides

d

Using SO2

answer is A.

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Detailed Solution

Superphosphate of lime is prepared to convert calcium phosphate (insoluble) into a soluble phosphate but it contains 2 moles of gypsum as a waste productCa3PO42+2H2SO4+5H2O→  CaH2PO42H2O.Calcium Super phosphateBut if H3PO4 is used in place of H2SO4 , the only product obtained is CaH2PO42which is water soluble.Ca3PO42+4H3PO4→3CaH2PO42Calcium triple phosphate.
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