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Chapter 11 The p Block Elements Solutions

Question - 31 : - Writebalanced equations for:

Answer - 31 : -

Question - 32 : - Giveone method for industrial preparation and one for laboratory preparation of COand C02 each.

Answer - 32 : -

Question - 33 : - Anaqueous solution of borax is
(a)neutral (b) amphoteric (c) basic (d) acidic

Answer - 33 : -

Boraxis a salt of a strong base (NaOH) and a weak acid (H3BO3),therefore, it is basic in nature, i.e., option (c) is correct.

Question - 34 : - Boricacid is polymeric due to
(a)its acidic nature (b) the presence of hydrogen bonds
(c)its monobasic nature (d) its geometry

Answer - 34 : -

Boricacid is polymeric due to the presence of H-bonds. Therefore, option (b) iscorrect.

Question - 35 : - Thetype of hybridisation of boron in diborane is
(a)sp (b) sp2(c)sp3(d) dsp2

Answer - 35 : -

In B2H6, B is sp3-hybridized.Therefore, option (c) is correct.

Question - 36 : - Thermodynamicallythe most stable form of carbon is
(a)diamond(b) graphite (c) fullerenes (d) coal 

Answer - 36 : -

Thermodynamicallythe most stable form of carbon is graphite, i.e., option (b) is correct.

Question - 37 : - Elementsof group 14
(a)exhibit oxidation state of +4 only (b) exhibit oxidation state of +2 and +4
(c)form M2-andM4+ ion (d) form M2+ and M4+ ions.

Answer - 37 : -

Dueto inert pair effect, elements of group 14 exhibit oxidation states of +2 and+4. Thus, option (b) is correct.

Question - 38 : - Ifthe starting material for the manufacture of silicons is RSiCl3 write the structureof the product formed.

Answer - 38 : - Hydrolysis of aikyltrichlorosilanes gives cross-linked silicons.

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