(i) Tannin
(ii) Calcium oxalate
(iii) Silica
(a) i and ii
(b) i and iii
(c) ii and iii
(d) i, ii and iii
Answer-(d) i, ii and iii
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(i) Tannin
(ii) Calcium oxalate
(iii) Silica
(a) i and ii
(b) i and iii
(c) ii and iii
(d) i, ii and iii
Answer-(d) i, ii and iii