Ozone attacks
1 Mercury and silver
2 Copper
3 Silver and iron
4 None of these
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why nitrogen is about 70%(i.e.)highest percentage in environment
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Gypsum is added to cement clinker to 1 Increase the tensile strength of cement 2 Bind the particles of calcium silicate 3 Decrease the rate of setting of cement 4 Facilitate the formation of colloidal gel
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