A) Ni
B) Fe
C) Cu
D) Mn
Correct Answer: C
Solution :
\[N{{a}_{2}}{{B}_{4}}{{O}_{7}}\xrightarrow{\Delta }2NaB{{O}_{2}}+{{B}_{2}}{{O}_{3}}\] |
\[CuO+{{B}_{2}}{{O}_{3}}\xrightarrow{\Delta }Cu\,{{(B{{O}_{2}})}_{2}}\] |
\[2Cu\,{{(B{{O}_{2}})}_{2}}+4NaB{{O}_{2}}+2C\xrightarrow{\Delta }2Cu\] |
(red and opaque) \[+\,2N{{a}_{2}}{{B}_{4}}{{O}_{7}}+2CO\uparrow \] |
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