Consider the following reactions Na _2 B_4 O _7 \stackrel{∆}{\\xrightarrow } 2 X+Y CuSO _4+Y \stackrel{\text{ Non-Luminous flame }{\\xrightarrow }} Z+ SO _3 2 Z+2 X+ Carbon \stackrel{\text{ Luminous flame }{\\xrightarrow }} 2 Q+ Na _2 B_4 O _7+C O The oxidation states of Cu in Z and Q , respectively are : [28 Jan 2026 Shift 2]

JEE Main 28 Jan 2026 Shift 2 Paper Solved Paper

Section: Chemistry

Question : 55 of 75

Marks: +1, -0

Consider the following reactions
Na2B4O7

∆

‌───────▶‌

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 :

[28 Jan 2026 Shift 2]

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