P Block Group 13 (Boron Family) Notes, Properties & Reactions

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Q 1 :

Consider the following reactions

${Na}_{2} B_{4} O_{7} \overset{Δ}{\to} 2 X + Y$

${CuSO}_{4} + Y \overset{Non-luminous flame}{\to} Z + {SO}_{3}$

$2 Z + 2 X + Carbon \overset{Luminous flame}{\to} 2 Q + {Na}_{2} B_{4} O_{7} + CO$

The oxidation states of Cu in Z and Q, respectively are: [2026]

+2 and +2
+1 and +1
+2 and +1
+1 and +2

(3)

${Na}_{2} B_{4} O_{7} \overset{Δ}{\to} \underset{(X)}{(2 {NaBO}_{2})} + B_{2} O_{3}$

${CuSO}_{4} + B_{2} O_{3} \to_{Non-luminous flame}^{Δ} \underset{\underset{(Z)}{(Blue bead)}}{\overset{+ 2}{Cu} {({BO}_{2})}_{2}} + {SO}_{3}$

$2 Cu {({BO}_{2})}_{2} + 2 {NaBO}_{2} + C \to_{Luminous flame}^{Δ} \underset{\underset{(Q)}{Colorless}}{2 \overset{+ 1}{Cu} {BO}_{2}} + {Na}_{2} B_{4} O_{7} + CO$

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Topic Question Set

Q 1 : Consider the following reactions Na2B4O7→Δ2X+Y CuSO4+Y→Non-luminous flameZ+SO3 2Z+2X+Carbon→Luminous flame2Q+Na2B4O7+CO The oxidation states of Cu in Z and Q, respectively are: [2026]

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