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NCERT Class XI Chemistry The p-Block Elements Solutions

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Question : 31 of 38
Marks: +1, -0
Write balanced equations for :
(i) BF3+LiH\mathrm{BF}_3 + \mathrm{LiH} →
(ii) B2H6+H2O\mathrm{B_2H_6} + \mathrm{H_2O} →
(iii) NaH+B2H6\mathrm{NaH} + \mathrm{B_2H_6} →
(iv) H3BO3\mathrm{H_3BO_3} →Δ\xrightarrow[]{ \Delta }
(v) Al + NaOH →
(vi) B2H6+NH3\mathrm{B_2H_6} + \mathrm{NH_3} →
Solution:  
(i) 2BF3+6LiH2\mathrm{BF}_3 + 6\mathrm{LiH} → N2H6+6LiF\mathrm{N_2H_6}+6\mathrm{LiF}
(ii) B2H6+H2O\mathrm{B_2H_6} + \mathrm{H_2O} → 2H3BO3+6H22\mathrm{H_3BO_3}+6\mathrm{H_2} ↑
(iii) 2NaH+B2H62\mathrm{NaH} + \mathrm{B_2H_6} → 2Na+[BH4]−2\mathrm{Na}^{+}[\mathrm{BH}_4]^{-}
(iv) 2H3BO32\mathrm{H_3BO_3} →Δ\xrightarrow[]{ \Delta } B2O3Boric oxide+3H2O\underset{\text{Boric oxide}}{\mathrm{B_2O_3}}+3\mathrm{H_2O}
(v) 2Al + 2NaOH + 6H2O6\mathrm{H_2O} → 2Na[Al(OH)4]+3H2Sod. tetrahydroxoauminate (III)\underset{\text{Sod. tetrahydroxoauminate (III)}}{2\mathrm{Na}[\mathrm{Al(OH)}_4]+3\mathrm{H_2}}
(vi) B2H6+NH3\mathrm{B_2H_6} + \mathrm{NH_3} → 2BH3⋅NH32\mathrm{BH_3} \cdot \mathrm{NH_3}
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