Consider the following reactions Na₂B₄O₇ Δ 2X + Y; CuSO₄ + Y Non-Luminous flame Z + SO₃; 2Z + 2X + Carbon Luminous flame 2Q + Na₂B₄O₇ + CO. The oxidation states of Cu in Z and Q, respectively are:

p-Block Elements: JEE Main 2026 Chemistry question

JEE Main 2026 · 28 Jan, Evening shift · Q69

JEE Main 202628 Jan, Evening shiftChemistryMediump-Block Elements95× since 2002

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}

;

\mathrm{2Z + 2X + Carbon \xrightarrow{\text{Luminous flame}} 2Q + Na_2B_4O_7 + CO}

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

JEE Main 2026 p-Block Elements Question with Solution (28 Jan Evening shift, Q69) | JEE Arc

JEE Main 2026 · 28 Jan, Evening shift · Q69

JEE Main 202628 Jan, Evening shiftChemistryMediump-Block Elements95× since 2002

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}

;

\mathrm{2Z + 2X + Carbon \xrightarrow{\text{Luminous flame}} 2Q + Na_2B_4O_7 + CO}

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