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In $K_2Cr_2O_7$ every $C_r$ is linked to

$(a)\;2\;O-atoms \\(b)\;3\;O-atoms \\(c)\; 4\;O-atoms \\(d)\;5\;O-atoms $

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Structure of $Cr_2O_7^{2-}$ contains $ 4\;O-atoms$
Hence c is the correct answer.
answered Mar 13, 2014 by meena.p
 
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