C a 2 B 6 O 11 + N a 2 C O 3 F u s e d − −− → ( A ) + ( B ) + C a C O 3 ( A ) + C O 2 → ( B ) + N a 2 C O 3 Solution ( B ) + C o n c . H C I → N a C I + A c i d ↓ H 2 O ( C ) S t r o n g l y − −−−− → h e a t e d ( D ) Acid ( C ) ( D ) + C u S O 4 H e a t e d − −−−− → i n f l a m e Blue coloured ( E ) compound compound (E) is - Options: A . &nbspCu2O B . &nbspCuS C . &nbspCuSO3 D . &nbspCu(BO2)2

Ca2B6O11+Na2CO3Fused−−−→(A)+(B)+CaCO3(A)+CO2→

Question

C a_{2} B_{6} O_{11} + N a_{2} C O_{3} F u s e d - -- \to (A) + (B) + C a C O_{3} (A) + C O_{2} \to (B) + N a_{2} C O_{3} Solution (B) + C o n c . H C I \to N a C I + A c i d ↓ H_{2} O (C) S t r o n g l y - ---- \to h e a t e d (D) Acid (C) (D) + C u S O_{4} H e a t e d - ---- \to i n f l a m e Blue coloured (E) compound compound (E) is -

Options:

A . Cu2O

B . CuS

C . CuSO3

D . Cu(BO2)2

Answer: Option D
:
D
Compound (A) is -

N a B O_{2}

Compound (B) is -

N a_{2} B_{4} O_{7}

Compound (C) is -

H_{3} B O_{3}

Compound (D) is -

B_{2} O_{3}

Compound (E) is -

C u (B O_{2})_{2}

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