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Q.

${Na}_{2} B_{4} O_{7} \cdot 10 H_{2} O \overset{Heat}{⟶} X + {NaBO}_{2} + H_{2} O, X + {Cr}_{2} O_{3} \overset{Heat}{⟶} \begin{matrix} Y \\ (Green coloured) \end{matrix}$
X and Y are:

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a

${Na}_{3} {BO}_{3} and Cr {({BO}_{2})}_{3}$

b

$B_{2} O_{3} and Cr {({BO}_{2})}_{3}$

c

$B_{2} O_{3} and {CrBO}_{3}$

d

${Na}_{2} B_{4} O_{7} and Cr {({BO}_{2})}_{3}$

answer is C.

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Detailed Solution

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${Na}_{2} B_{4} O_{7} \cdot 10 H_{2} O \overset{}{\to_{- 10 H_{2} O}^{∆}} {Na}_{2} B_{4} O \overset{}{\to 2 {NaBO}_{2}} + B_{2} O_{3}$
$3 B_{2} O_{3} + {Cr}_{2} O_{3} \overset{heat}{⟶} 2 \underset{\underset{(Green coloured))}{(Y)}}{Cr {({BO}_{2})}_{3}}$

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