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Which of the following metal salts gives a red and opaque borax bead in the reducing flame (in cold)?

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Which of the following metal salts gives a red and opaque borax bead in the reducing flame (in cold)?
A. `Ni`
B. `Fe`
C. `Cu`
D. `Mn`
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Correct Answer - C
`Na_(2)B_(4)O_(7) oversetDeltato2NaBO_(2)+B_(2)O_(3)`
`CuO+B_(2)O_(3)overset(Delta)toCu(BO_(2))_(2)`
`2Cu(BO_(2))_(2)+4NaBO_(2)+2Coverset(Delta)to2Cu("red and opaque")+2Na_(2)B_(4)O_(7)+2CO uarr`
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