Title DPP-2 SOLUTION.pdf ✅

CLASS : XIth SUBJECT : CHEMISTRY DATE : DPP No. : 2 1 (d) All are facts about Hg. 2 (a) The most abundant transition metal is Fe. 3 (a) All those inner-transition elements having +2 oxidation state, changes to +3, and act as reducing agents. While those having +4 tend to change to +3 and act as oxidizing agents. Therefore, Np 4+ acts as an oxidizing agent 4 (a) Oxide of Mn in its intermediate oxidation state i.e., +4 is MnO2. This is amphoteric in character. 5 (c) Silver nitrate decomposes to silve nitrite on heating above its melting point (212°C). 2AgNO3 > 212°C 2AgNO2 + O2 On heating above 450°C (red hot), silver nitrate decomposes to metallic silver, oxide of nitrogen and oxygen. 2AgNO3 > 450°C 2Ag + 2NO2 + O2 6 (a) Cu2+ has one unpaired electron. 7 (d) ZnSO4 forms soluble zincates. 8 (d) Thermite is Fe2O3 +Al used for welding. 9 (a) Cu2O is called ruby copper. 10 (c) Np and Pu in NpO + 3 and PuO + 3 oxocations show +7 oxidation state which are not so stable 11 (a) Ammonia soda process is for manufacture of Na2CO3. Topic :- THE D-AND F-BLOCK ELEMENTS Solutions
12 (a) Steel is the most important commercial variety of iron having percentage of carbon 0.25 ― 2 (between cast iron wrought iron). 13 (c) 28Ni 2+ has two unpaired electrons, 22Ti 3+ , has one unpaired electron. 15 (a) Ionization energy increases along the period and therefore, they have lesser values than p- block and more value of IE than s-block elements. 17 (a) Cu, Ag, Au group of element are called coinage metals as these are used in minting coins. 18 (a) Cadmipone is CdS + BaSO4. 19 (c) Correct order of melting points is Mn(1246 C) < Ti(1668 C) < V ≈ Cr(1907 C) 20 (d) Actual composition of chromite ore(FeCr2O4) is FeO.Cr2O3. In FeO, the oxidation state of Fe is +2 while in Cr2O3, the oxidation state of Cr is +3.
ANSWER-KEY Q. 1 2 3 4 5 6 7 8 9 10 A. D A A A C A D D A C Q. 11 12 13 14 15 16 17 18 19 20 A. A A C A A D A A C D