PPSC Chemistry Full Book Test With Answers

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PPSC Chemistry Full Book Test

Sr. # Questions Answers Choice
1 Un-like s -block elements d-block elements form which compounds as well ionic compounds Co valent compound Co ordinate compounds None of above
2 Ten elements Sc (Z = 21) to Zn (Z = 30) fill their 4s orbitals first and then 3d orbitals are called elements. of. 3 d series. 4d Series 5d Series None of above
3 Elements in which differentiating electron enters the (n-1) the d-orbitals of the (n-1) the main shell are called elements. s- block p-block d-block f-block
4 Carbon in wrought iron is present as Silicon carbide Iron carbide or comentite Graphite Partly as iron carbide and partly as graphite
5 Stainless steel contains. Fe + Cr+ Ni Fe + Ni + Cu Fe + Cr+ Cu Cu + C + Ni
6 If Steel is heated to a temperature well below red heat and to then cooled slowly the process is called. Annealing Quenching Tempering Nitriding
7 In extraction of iron, the furnace charge consists of iron ore, coke and limestone. The function of limestone is to act as. An oxidation agent A reducing agent Flux Slag
8 Molten iron withdrawn from the blast furnace is called. Wrought iron Pig iron Bessemer iron Stainless steel
9 In the forth floatation process for the purification of ores, the ore particles float because. They are light Their surface is not easily vetted by water They bear electrostatic charge They are insoluble
10 The number used in cancer therapy is. Fe Co Ni Rn
11 Transition elements, in general exhibit the following properties, except one Name that property. Variable oxidation state Natural radioactivity Tendency to form complexes Formation of alloys
12 Which of the following statements false about transition metals. They form complexes They show variable valency All transiting metal compounds are paramagnetic They form coloured ions
13 Which one of the following ions is colourless. Cu+ Co2+ Ni2+ Fe3+
14 Gold dissolves in aqua regia forming AuCl Au(NO3)3 AuCl3 HAuCl4
15 Which of the following is soluble in water. AgF AgCl AgBr Ag I
16 Which of the following alloys contains Cu and Zn Bronze Brass Gun metal Type metal
17 The rusting of iron is catalyzed by which of the following. Fe H+ O2 Zn
18 Which of the following is not correct. Rusting of iron can be stopped by increasing the concentration of CO2 in water Rusting of iron is electrochemical in nature. Rusting of iron takes place in moist air Rusting of iron produces hydrated iron (III) oxide
19 Finely divided iorn combines with CO to give Fe(CO)3 Fe2 (CO)9 F33(CO)12 Fe(CO)6
20 In the metallurgy of iron, when limestone is added to the blast furnaced, the calcium ion ends up in Slag Gangue Metallic calcium Calcium carbonate
21 Pick out incorrect statement about K2Cr2O7 It oxidizes acidified solution H2SO4 to S It oxidizes KI to I2 It oxidizes HCl to Cl2 It gives oxygen, when treated with cold conc. H2SO4
22 Pick out the incorrect statement about K2Cr2O7 It is thermally stable It dissolves in alkali to form chromate It oxidizes acidified FeSO4 solution to Fe2(SO4)3 It is used as cleansing agent for glassware. etc. When mixed with cold con. H2SO4
23 The yellow colour of chromates changes to orange red on acidification, due to the formation of. Cr3+ Cr2O3 Cr2O7<sup>2-</sup> Cro3
24 Which one of the following oxides is basic. MnO Mn2O3 MnO2 Mn2O7
25 The first ionization energies of the elements of the first transition series. (Ti _____ Cu) Increases as the atomic number increases decreases as the atomic number increases Do not show any change as the addition of electrons takes place in the inner (n-1) d -orbitals. Increases from Ti to Mn and then decreases from Mn to Cu
26 Which one of the following statements is not true. Transition metals form alloys Transition metals form complexes Zn, Cd and Hg are transition metals K2[PtCl6] is a well known compound but corresponding nikel compound is not knonwn
27 Pick out the incorrect statements for transition metals. They have low melting and boiling points 5d-element have higher energies than 3d or 4 d elements Zr and Hf have almost identical atomic and ionic radii They form interstitial compounds.
28 The atomic number of Potassium is 19 and that of manganese is 25. Although the coloured of MnO4 is dark violet yet the K+ is colourles.. This is due to the fact that Mn is a transition element while K+ is not [MnO4]is negatively charged while K+ has a positive charge The effective atomicnumebr of Mn is [MnO4] is 26 while for K+ the atomic number is 18 The Mn in a high positive oxidation state allows charge transfer transitions
29 Pick out the incorrect statement for transition metals. Cu+ is not a transition metal ion Transition metals do not exhibit variable oxidation states Transition metal ions are coloured Transition metals and majority of their compounds are paramagnetic
30 The electronic configuration of chromium is 4s1, 3d5, The elements tungsten (W) belongs to the same group and has atomic number 74.The configuration of its valence shell is. 5s1, 4d5 6s1, 5d5 6s1, 5d6 6s1, 5d4
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