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