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Suppose you are using a meter scale (metalic) marked 0 to 100cm .Let the scale is graduated at 20°c & you are taking reading at 40°c . Let the scale becomes 101cm but you count it 100cm so measured reading is less than actual reading .does the roasting of cinnabar (Hgs), producemetallic mercury and not its oxideelectrons are required to discharge 3 moles of Ca++ ion
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