The major chemical compound found in kidney stones is : 

(a) urea (b) calcium carbonate (c) calcium oxalate (d) calcium sulphate

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(c) The composition of kidney stone is

Calcium oxalate                – 80%

Uric acid                           – 5%

Amino acid cystine             – 2 %

Magnesium and                 – 13%

ammonium phosphate

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