Consider the following reactions \({\mathrm{Na}}_{2}{\mathrm{B}}_{4}{\mathrm{O}}_{7}\overset{\Delta }{\to }2\mathrm{X}+\…

Consider the following reactions

\({\mathrm{Na}}_{2}{\mathrm{B}}_{4}{\mathrm{O}}_{7}\overset{\Delta }{\to }2\mathrm{X}+\mathrm{Y}\)

\({\mathrm{CuSO}}_{4}\text{ }+\text{ }\mathrm{Y}\text{ }\overset{\mathrm{Non}−\mathrm{Luminous}\text{  }\mathrm{flame}}{\to }\mathrm{Z}+{\mathrm{SO}}_{3}\)

\(2\mathrm{Z}+2\mathrm{X}\text{ }+\text{ }\mathrm{Carbon}\text{ }\overset{\mathrm{Luminous}\text{  }\mathrm{flame}}{\to }2\mathrm{Q}\text{  }+\text{ }{\mathrm{Na}}_{2}{\mathrm{B}}_{4}{\mathrm{O}}_{7}+\mathrm{CO}\)

The oxidation states of Cu in Z and Q, respectively are:

[JEE Main 2026, 28 Jan (Shift 2)]