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Kana ram gurjar

· started a discussion

· 1 Months ago

Solve (Question:137455.0)

Please define fully

Question:

The maximum permissible colour for domestic supplies based on cobalt scale is

Options:
A) 5 ppm
B) 10 pmm
C) 20 ppm
D) 50 ppm
Solution:
Ans: (c) 20 ppm

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