The p-Block Elements

Assertion and Reason:

Directions:

(a) Assertion and reason both are correct statements and reason is correct explanation for assertion.

(b) Assertion and reason both are correct statements but reason is not correct explanation for assertion.

(c) Assertion is correct statement but reason is wrong statement.

(d) Assertion is wrong statement but reason is correct statement.

11.39. Assertion: Non-metals readily form anions, in contrast to metals whichreadily form cations. 

Reason: In general, non-metals have higher ionisation enthalpies and higherelectronegativities than the metals.

11.38. If the starting material for the manufacture of silicones is RSiCl₃, write the structure of the product formed. (Advance)

11.37. Elements of group 14
(a) exhibit oxidation state of +4 only (b) exhibit oxidation state of +2 and +4
(c) form M^2-and M⁴⁺ ions (d) form M²⁺ and M⁴⁺ ions

11.36. Thermodynamically the most stable form of carbon is
(a)diamond (b) graphite (c) fullerenes (d) coal 

11.35. The type of hybridisation of boron in diborane is
(a) sp (b) sp²(c) sp³(d) dsp²

11.34. Boric acid is polymeric due to
(a) its acidic nature (b) the presence of hydrogen bonds
(c) its monobasic nature (d) its geometry

11.33. An aqueous solution of borax is
(a) neutral (b) amphoteric (c) basic (d) acidic

11.32. Give one method for industrial preparation and one for laboratory preparation of CO and CO₂ each.

11.31. Write balanced equations for:

Write balanced equations for:

(i) BF₃ + LiH →

(ii) B₂H₆ + H₂O →

(iii) NaH + B₂H₆ →

(iv) H₃BO₃(heat) →

(v) Al + NaOH →

(vi) B₂H₆ + NH₃ →

11.30. A certain salt X, gives the following results.
(i) Its aqueous solution is alkaline to litmus.
(ii) It swells up to a glassy material Y on strong heating.
(iii) When conc.H₂SO₄is added to a hot solution of X, white crystal of an acid Z separates out.

Write equations for all the above reactions and identify X, Y and Z. (Advance)