Tiêu đề DPP-4 SOLUTION.pdf ✅

CLASS : XIth SUBJECT : CHEMISTRY DATE : DPP No. : 4 1 (a) 3CaO+2NH3⟶3Ca+N2+3H2O ∴ N2gas is evolved when CaO reacts with NH3. 2 (a) Bartlett prepared first compound of Xe as Xe+[PtF6 ]― , a red orange crystalline solid. Xe + PtF6⟶Xe+[PtF6 ]― 3 (a) P2O5 is very good dehydrating agent. 5 (a) Na2 SO3 reacts with hot and dil, H2SO4 to give SO2 gas which decolourise bromine water Na2SO3+ H2SO4⟶ Na2SO4+SO2+H2O Br2+ H2O⟶2HBr+[O] SO2+[O]⟶SO3 decolourisation of bromine water 6 (c) (NH4 )2Cr2O7⟶N2 + Cr2O3 + 4H2O 7 (c) (NH4 )2 SO4 + H2O⟶NH4OH + H2SO4 8 (c) Fluorine due to its very high electronegativity oxidises sulphur to its highest oxidation state and thus, forms SF6 where S shows its maximum coordination number 9. (a) B in BCl3 is sp 2 -hybridised; N in NCl3 has sp 3 -hybridisation with one lone pair of electron. 10 (b) Cl2O has sp 3 -hybridized oxygen atom with two lone pairs. 11 (d) Excitation energy of F(2p-electrons) is more than excitation energy of iodine (5p-electrons). 12 (d) Topic :-THE P-BLOCK ELEMENTS-2 Solutions