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The p-Block Elements — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryThe p-Block Elements5 Marks
Question
i. Explain:
1. $\mathrm{CCl}_4$ doesn't hydrolyse unlike $\mathrm{SiCl}_4$.
2. Ga has a lower atomic radius compared to Al.
ii. Write balanced equations for:
a. Silicon dioxide is treated with hydrogen fluoride.
b. Boric acid is added to water.
iii. Diborane reacts with $\mathrm{NH}_3$ followed by heating.
✓

Answer

  1.  
  1. It is because 'C' does not have d-orbitals.
  2. It is due to poor sheilding effect of d-electrons present in Ga as a result of which effective nuclear charge increases.
  1.  
  1. $\text{SiO}_2\ +\ 6\text{HF}\ \xrightarrow{\ \ \ \ \ \ \ \ }\ \text{H}_2\text{SiF}_6\ +\ 2\text{H}_2\text{O}$
  2. $\text{H}_3\text{BO}_3\text{}\ +\ \text{H}_2\text{O}\ \xrightarrow{\ \ \ \ \ \ }[\text{B(OH})_4]^{-}\ +\ \text{H}^+$
  1. $ 3\text{B}_2\text{H}_6\ +\ 6\text{NH}_3\ \xrightarrow{\ \ \ \Delta\ \ \ }\ 2\text{B}_3\text{N}_3\text{H}_6\ +\ 12\text{H}_2\\ ^\text{Diborane}\ \ \ \ \ ^\text{Ammonia}\ \ \ \ \ \ \ \ \ \ \ \ \ \ ^\text{Borazole}\ \ \ \ \ \ \ \ \ ^\text{Hydrogen}$

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