Complete the following chemical equations :Z + 3 LiAiH4 → X + 3 Lif + 3AIF33X + 3O2 → B2 O3 + 3H2O

Z is BF3 which on reaction with a strong reducing agent like LiAlH4 gives B2H6 (X) which on oxidation yields borate.Thus, the reactions are:

Q35 of 50 Page 138

Complete the following chemical equations :
Z + 3 LiAiH₄ → X + 3 Lif + 3AIF₃

3X + 3O₂ → B₂ O₃ + 3H₂O

Z is BF₃ which on reaction with a strong reducing agent like LiAlH₄ gives B₂H₆ (X) which on oxidation yields borate.

Thus, the reactions are:

Explain the following :

(i) Gallium has higher ionisation enthalpy than aluminium.

(ii) Boron does not exist as B3+ ion.

(iii) Aluminium forms [AlF₆]^3- ion but boron does not form [BF₆]^3- ion.

(iv) PbX₂ is more stable than PbX₄.

(v) Pb⁴⁺ acts as an oxidising agent but Sn²⁺ acts as a reducing agent.

(vi) Electron gain enthalpy of chlorine is more negative as compared to fluorine.

(vii) Tl (NO₃)₃ acts as an oxidising agent.

(viii) Carbon shows catenation property but lead does not.

(ix) BF₃ does not hydrolyse.

(x) Why does the element silicon, not form a graphite like structure whereas carbon does.

Identify the compounds A, X and Z in the following reactions :

(i) A + 2HCL + 5H₂O → 2NaCI + X

X → HBO₂ → Z

Match the species given in Column I with the properties mentioned in Column II.

Match the species given in Column I with properties given in Column II.