Tiêu đề DPP-5 SOLUTION.pdf ✅

CLASS : XIth SUBJECT : CHEMISTRY DATE : DPP No. : 5 1 (b) Ag salts on strong heating form Ag. 2 (b) Mond’s process involves extraction of Ni. Ni + 4CO 335K Ni(CO)4 (Volatile); Ni(CO)4 450K Ni + 4CO 3 (c) 2Fe2 (SO4 )3 +3K4 [Fe(CN)6 ]⟶Fe4 [Fe(CN)6 ]3 (Prussian blue) +6K2SO4. 4 (c) German silver is an alloy of copper, zinc and nickel. It is used in utensils and resistance wire. 5 (b) Due to the formation of CuCO3.Cu(OH)2; green 6 (b) It is a reason for the given fact. 7 (a) FeSO4 is mostly used in manufacture of blue-black ink, as a mordant in dyeing and tanning industries. 8 (c) It is a trade name for CuSO4.5H2O. 9 (a) The elements having incomplete d-orbital can show variable oxidation state (because the electrons move the two levels of d itself) ∴ Zn has completely filled d-orbital. ∴ It does not show variable oxidation state. It always show +2 oxidation state. 11 (b) It is a fact. 12 (b) Ag2O ∆ 2Ag + 1 2 O2 Topic :- THE D-AND F-BLOCK ELEMENTS Solutions
13 (a) Calamine (ZnCO3 )is an ore of zinc. 14 (b) Haematite (Fe2O3) having FeO is first oxidized to Fe2O3 and then reduced to Fe by Co. 15 (b) MnO2 forms amphoteric oxide due to intermediate oxidation state 16 (d) Ir does not dissolve in aqua regia as it is much more noble than Au and Pt 17 (d) Hg has +1 oxidation state in Hg2Cl2. 18 (b) [Co(NH3 )5Cl]Cl2 ionizes to [Co(NH3)5Cl]2+ and Cl ― . These 2Cl ― react with Ag + to form white ppt. of AgCl. 19 (d) All are facts. 20 (a) K2Cr2O7 + H2SO4 + 4H2O2→K2SO4 + 2CrO5 + 5H2O
ANSWER-KEY Q. 1 2 3 4 5 6 7 8 9 10 A. B B C C B B A C A C Q. 11 12 13 14 15 16 17 18 19 20 A. B B A B B D D B D A