(ii) Radius ratio is the ratio of the radius of ………… to that of ………….
(iii) Mercury from cinnabar is obtained from………….. while pyrolusite is concentrated by…………
(iv) Calcination is the heating of metal ore below its…………..in…………..of air.
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3.Radius ratio is the ratio of radius of cation to the ratio of the radius of anion. Usually cation is smaller than anion. Hence, the radius ratio is less than one.
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