PPSC Chemistry Part III Inorganic Chemistry Online Test With Answers

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PPSC Chemistry Part III Inorganic Chemistry Online Test

Sr. # Questions Answers Choice
1 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
2 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
3 The yellow colour of chromates changes to orange red on acidification, due to the formation of. Cr3+ Cr2O3 Cr2O7<sup>2-</sup> Cro3
4 Which one of the following oxides is basic. MnO Mn2O3 MnO2 Mn2O7
5 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
6 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
7 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.
8 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
9 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
10 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
11 Which of the following has maximum number of unpaired electrons. Fe3+ Fe2+ Co2+ CO3+
12 Of the molecules, SF4 Xe F4 and CF4 which have square planar geometry. SF4 , Xe f4 and CF4 SF4 only CF4 only XeF4 only
13 Which of the following is not known. KrF6 XeF6 XeO3 KrF2
14 Xenon reacts best with The most electropositive elements The most electronegative elements The hydrogen halides Non metals
15 Which one of the following is not correct. Ar is used in electric bulbs Kr is obtained during radioactive decay Boiling point of H2 is lowest among all noble gases. Xe forms Xe OF4
16 Which one of the following is not formed when an electric discharge passes through helium. HeH+ HeH2+ He2+ He2-
17 The state of hybridization of Xe in Xe F6 are sp2 sp3 sp3 d dsp3
18 The geometry of Xe F2 is Triangular planar Square planar Linear Trigonal bipyramidal
19 Xe reacts directly with O2 Cl2 F2 Br2
20 The noble gases which does not I do not form any clathrates is. He Ne Argpm Both He and Ne
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