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  • Identify P, Q and R from the reactions given below, which involves the conversion of borax to boron in the crystalline form. <img alt="\mathrm{\text { Borax } \stackrel{\text { HCl }

Identify P, Q and R from the reactions given below, which involves the conversion of borax to boron in the crystalline form.

\mathrm{\text { Borax } \stackrel{\text { HCl }}{\longrightarrow} P \stackrel{\Delta}{\longrightarrow} Q \stackrel{R}{\Delta} \text { Boron }}
 

Option: 1

\mathrm{\mathrm{H}_3 \mathrm{BO}_3, \mathrm{~B}_2 \mathrm{O}_3, \mathrm{AC}}


Option: 2

\mathrm{\mathrm{H}_2 \mathrm{BO}_4, \mathrm{~B}_2 \mathrm{O}_3, \mathrm{C}}


Option: 3

\mathrm{\mathrm{H}_2 \mathrm{~B}_4 \mathrm{O}_7, \mathrm{~B}_2 \mathrm{O}_3, \mathrm{AC}}


Option: 4

\mathrm{\mathrm{H}_2 \mathrm{~B}_4 \mathrm{O}_7, \mathrm{~B}_2 \mathrm{O}_3, \mathrm{Mg}}


Answers (1)

best_answer

\mathrm{ \mathrm{Na}_2 \mathrm{~B}_4 \mathrm{O}_7+2 \mathrm{HCl}+5 \mathrm{H}_2 \mathrm{O} \rightarrow 2 \mathrm{NaCl}+4 \mathrm{H}_3 \mathrm{BO}_3 (P)}

On cooling, crystals of \mathrm{\mathrm{H}_3 \mathrm{BO}_3} are obtained on heating P above\mathrm{ 200^{\circ} \mathrm{C}}

\mathrm{4 \mathrm{H}_3 \mathrm{BO}_3 \rightarrow 2 \mathrm{~B}_2 \mathrm{O}_3+6 \mathrm{H}_2 \mathrm{O}}

\mathrm{\mathrm{H}_3 \mathrm{BO}_3 \stackrel{100^{\circ} \mathrm{C}}{\longrightarrow} \mathrm{HBO}_2 \stackrel{100^{\circ} \mathrm{C}}{\longrightarrow} \mathrm{H}_2 \mathrm{~B}_4 \mathrm{O}_7 \stackrel{\text { srong }{\triangle}}{\longrightarrow} \mathrm{B}_2 \mathrm{O}_3(Q)}

\mathrm{\mathrm{B}_2 \mathrm{O}_3+\underset{(R)}{2 \mathrm{Al}} \rightarrow 2 \mathrm{~B}+\mathrm{Al}_2 \mathrm{O}_3}

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chirag

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