Answer:
(c)
Basic
This is due to the hydrolysis as it is a salt of strong
alkali and weak acid.
\[N{{a}_{2}}{{B}_{4}}{{O}_{7}}+7{{H}_{2}}O\rightleftharpoons
CaC{{l}_{2}}+{{H}_{2}}O+C{{O}_{2}}\]
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