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12. p-Block (Group 13 to 14) NM Solution (+1) Chem.pdf -...

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p-block (GROUP 13 & 14)1Group - 131.Boric acid H3BO3and BF3have the same number of elec-trons. The former is a solid and the latter is a gas. Thereason is:(a) BF3is a Lewis acid while B(OH)3is not(b) they have different geometrics(c)In BF3, Fis smaller in size than OHin B(OH)3(d) No molecular association is possible in BF3while itis possible in B(OH)3due to hydrogen bonding2.Ionisation enthalphy (-111Hin kJ mol) for the elementsof group 13 follows the order:(a) B > Al > Ga > In > Tl(b) B < Al < Ga < In < TlBorax bead test is responded by:(b) heavy metals(c) light metals(d) metals which form coloured metaboratesConceptual3.On the addition of mineral acid to an aqueous solutionof borax, the following compound is formed:(a) boron hydride(b) orthoboric acid(c) metaboric acid(d) pyroboric acid]4.Which of the following compounds is formed when bo-ron trichloride is treated with water?(a) H3BO3+ HCl(b) B2H6+ HCl(c) B2O3+ HCl(d) None of theseAns.(a)Sol.BCl3+ H2B(OH)3+ HCl5.The hardest compound of boron is:EXERCISE - 1 : BASIC OBJECTIVE QUESTIONSAns.(b)Sol.Conceptual6.When strongly heated, orthoboric acid leaves a residueof:Ans.(c)Sol.10014033224723CH BOHBOH B OB O7.Boric acid is prepared from borax by the action of :78.Borax bead test is responded by:(a) divalent metals(b) heavy metals(c) light metals(d) metals which form coloured metaboratesAns.(d)Sol.Conceptual9.Borazole, B3N3H6is related to benzene as:Sol.
p-block (GROUP 13 & 14)2Borazole10.Reactivity of borazole is higher than that of benzenebecause:
Sol.Conceptual[Note: In benzene,-electrons are delocalised over thering which give stability to benzene ring.]

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