Jee Main
P Block Elements
JEE Main 2026 (Online) 28th January Evening Shift
MCQ+4 / -12026
Consider the following reactions
$\mathrm{Na_2B_4O_7} \xrightarrow{\Delta} 2X + Y$
$\mathrm{CuSO_4} + Y \xrightarrow{\text{Non-Luminous flame}} Z + SO_3$
$2Z + 2X + \text{Carbon} \xrightarrow{\text{Luminous flame}} 2Q + \mathrm{Na_2B_4O_7} + CO$
The oxidation states of Cu in Z and Q, respectively are :