Consider the following reactions
Carbon 
The oxidation states of Cu in Z and Q , respectively are :
Text Solution
Verified by ExpertsD
The given reactions describe the Borax Bead Test.
When borax ( 
) is heated, it first loses water and then melts to form a transparent glassy bead consisting of sodium metaborate ( 
) and boric anhydride ( 
).
In the non-luminous (oxidizing) flame, 
reacts with 
to form copper(II) metaborate ( 
), which is blue in color.
In 
, the oxidation state of Cu is +2.
In the luminous (reducing) flame, the copper(II) metaborate is reduced by carbon to copper(I) metaborate ( 
), which is colorless/red.
In 
, the oxidation state of Cu is +1.
Therefore, the oxidation states of 
in 
and 
are +2 and +1 respectively.
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