Q.

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

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a

i and ii

b

i, ii and iii

c

iii only

d

i and iii

answer is D.

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Detailed Solution

(i) Boron reacts with concentrated HNO3​ to form nitric oxide and boric acid.B+HNO3+H2O→H3BO3+NO(ii) Boron reacts with fused Sodium Hydroxide to form Sodium Borate and Hydrogen. B+6NaOH→2Na3BO3+3H2(iii) Boron reacts with SiO2 to form Si and B2​O3  4B+3SiO2→3Si+2B2O3
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