CLASS : XIth SUBJECT : CHEMISTRY DATE : DPP No. : 5 1 (a) H2S + H2SO4⟶SO2 + 2H2O + S 3 (a) The reducing property of the hydrides of VA group increases from NH3 to BiH3 NH3
PH3>AsH3>SbH3>BiH3 Thermal stability of VA group hydrides deceases from NH3 to BiH3 NH3>PH3>AsH3>SbH3>BiH3 Bond angle of VA group hydrides decreases from NH3 to BiH3. NH3>PH3>AsH3>SbH3>BiH3 4 (d) The deficiency of iodine in diet causes goitre. 5 (b) 3-OH groups are present hence, it is tribasic 6 (d) The solubility increases with increase is mol. wt. 7 (b) It is a fact. 8 (c) He is obtained during radioactive decay. 9 (d) Zero group element show less chemical activity because this group element have 8 electrons in outermost orbit 10 (a) 2FeCl3 + H2S⟶2FeCl2 + 2HCl + S O P HO OH OH Topic :-THE P-BLOCK ELEMENTS-2 Solutions
11 (c) HPO3 + H2O⟶H3PO4 12 (d) O3 forms ozonides with each molecule having C=C bond or C≡C bond. 13 (d) Argon is found abundantly in the atmosphere. 14 (d) SO2 +2CuCl2 +2H2O KCNS Cu2Cl2 White + H2SO4 +2HCl 15 (a) CO + Cl2⟶COCl2 16 (d) This is a method to separate noble gases. 17 (c) It is a reason for the given fact. 18 (c) NCl3 + 3H2O⟶NH3 + 3HOCl 19 (b) HNO3 is strongest oxidant among all. 20 (a) Larger is the bond length, easier is its dissociation and more is acidic nature in halogen acids.
ANSWER-KEY Q. 1 2 3 4 5 6 7 8 9 10 A. A A A D B D C D A C Q. 11 12 13 14 15 16 17 18 19 20 A. C D D D A D C C B A 
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