`Na_(2)B_(4)O_(7).10H_(2)Ooverset("Heat")rarrX + NaBO_(2) + H_(2)O, X + Cr_(2)O_(3) overset("Heat")rarrunderset(("Green coloured"))Y`
X and Y are :
A. `Na_(3)BO_(3)` & `Cr(BO_(2))_(3)`
B. `Na_(2)B_(4)O_(7)` & `Cr(BO_(2))_(3)`
C. `B_(2)O_(3)` & `Cr(BO_(2))_(3)`
D. `B_(2)O_(3)` & `CrBO_(3)`
