First slide

Anomalous properties of Boron

Question

Which of the following statements are correct ?
i) Boron reacts with concentrated HNO₃ to form nitric oxide and boric acid
ii) Boron reacts with fused NaOH to form boric acid and hydrogen
iii) Boron reacts with SiO₂ to form Si and B₂O₃

Moderate

A

i and ii
B

i, ii and iii
C

iii only
D

i and iii

Solution

(i) Boron reacts with concentrated HNO₃ to form nitric oxide and boric acid.
$B + {HNO}_{3} + H_{2} O \to H_{3} {BO}_{3} + NO$
(ii) Boron reacts with fused Sodium Hydroxide to form Sodium Borate and Hydrogen.
$B + 6 NaOH \to 2 {Na}_{3} {BO}_{3} + 3 H_{2}$
(iii) Boron reacts with SiO₂ to form Si and B₂O₃
$4 B + 3 {SiO}_{2} \to 3 Si + 2 B_{2} O_{3}$

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