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Which of the following on heating with `K_(2)Cr_(2)O_(7)` and conc. `H_(2)SO_(4)` with organge red color vapours ?

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Which of the following on heating with `K_(2)Cr_(2)O_(7)` and conc. `H_(2)SO_(4)` with organge red color vapours ?
A. NaCl
B. `ZnCl_(2)`
C. `Hg_(2)Cl_(2)`
D. `AgCl`
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Correct Answer - A,B
`Hg_(2)Cl_(2)` is covalent and AgCl is insoluble in water 1 and so cannot give chromyl chloride test.
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`K_(2)Cr_(2)O_(7)`, on heating gives
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