\[C{{a}_{2}}{{B}_{6}}{{O}_{11}}+2N{{a}_{2}}C{{O}_{3}}\to X-2CaC{{O}_{3}}+2NaB{{O}_{2}}.\]The compound X in the above reaction is

\[N{{a}_{2}}{{B}_{4}}{{O}_{7}}\]

\[{{H}_{2}}{{B}_{4}}{{O}_{7}}\]

\[C{{a}_{2}}{{B}_{6}}{{O}_{11}}+2N{{a}_{2}}C{{O}_{3}}\to X-2CaC{{O}_{3

1.	\[C{{a}_{2}}{{B}_{6}}{{O}_{11}}+2N{{a}_{2}}C{{O}_{3}}\to X-2CaC{{O}_{3}}+2NaB{{O}_{2}}.\]The compound X in the above reaction is
A.	\[N{{a}_{2}}{{B}_{4}}{{O}_{7}}\]
B.	\[HB{{O}_{2}}\]
C.	\[{{H}_{3}}B{{O}_{3}}\]
D.	\[{{H}_{2}}{{B}_{4}}{{O}_{7}}\]
Answer» B. \[HB{{O}_{2}}\]

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\[C{{a}_{2}}{{B}_{6}}{{O}_{11}}+2N{{a}_{2}}C{{O}_{3}}\to X-2CaC{{O}_{3}}+2NaB{{O}_{2}}.\]The compound X in the above reaction is

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