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Which of the following statements regarding glass is not true?

$\begin{array}{1 1}\text{Glass has no fixed melting point}\\\text{Ordinary glass is a mixture of sodium and calcium silicates and may be represented as }Na_2SiO_3,CaSiO_3\\\text{Small amounts of Co(II),Cr(III),Fe(III) and Mn(IV) compounds impart respectively blue,green,brown,violet colours to the glass}\\\text{Flint glass has a low refractive index}\end{array} $

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Answer : Flint glass has a low refractive index
Flint glass is a lead-potash-lime glass and it has high refractive index.
answered Jul 25, 2014 by sreemathi.v
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