(B) Sodium borate $(Na_2B_4O_7)$ is a salt of a strong base $(NaOH)$ and a weak acid (boric acid,$H_3BO_3$).When dissolved in water,it undergoes anion

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(B) Sodium borate $(Na_2B_4O_7)$ is a salt of a strong base $(NaOH)$ and a weak acid (boric acid,$H_3BO_3$).When dissolved in water,it undergoes anionic hydrolysis.The borate ions $(B_4O_7^{2-})$ react with water to produce $OH^-$ ions,which makes the solution alkaline.Therefore,the $pH$ of the solution is $> 7$.