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The natural sources of oxalic acid, lactic acid and methanoic acid respectively are :
- (a)tomato, curd, ant-sting
- (b)tomato, orange, nettle-sting
- (c)orange, milk, ant-sting
- (d)orange, sour milk, nettle-sting
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(A) / tomato, curd, ant-sting (1 Mark)