PPSC Chemistry Full Book Test With Answers

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PPSC Chemistry Full Book Test

Sr. # Questions Answers Choice
1 Which of the following has maximum number of unpaired electrons. Fe3+ Fe2+ Co2+ CO3+
2 Of the molecules, SF4 Xe F4 and CF4 which have square planar geometry. SF4 , Xe f4 and CF4 SF4 only CF4 only XeF4 only
3 Which of the following is not known. KrF6 XeF6 XeO3 KrF2
4 Xenon reacts best with The most electropositive elements The most electronegative elements The hydrogen halides Non metals
5 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
6 Which one of the following is not formed when an electric discharge passes through helium. HeH+ HeH2+ He2+ He2-
7 The state of hybridization of Xe in Xe F6 are sp2 sp3 sp3 d dsp3
8 The geometry of Xe F2 is Triangular planar Square planar Linear Trigonal bipyramidal
9 Xe reacts directly with O2 Cl2 F2 Br2
10 The noble gases which does not I do not form any clathrates is. He Ne Argpm Both He and Ne
11 Which of the following has highest ionization energy. Oxygen Argon Barium Caealum
12 The noble gas which was discovered first in the sun and then on the earth is. Helium Neon Argon Xenon
13 Helium is used in weather balloons and airships instead of H2 becuse it is. Lighter than hydrogen Incombustible More abundant than hydrogen Radiactive
14 The oxidation number Xe in XeOF2 is 0 +2 +4 +3
15 Helium oxygen mixture is used by deep sea divers in preference to nitrogen oxygen mixture, because. Helium is much less soluble in blood than nitrogen Nitrogen is much less soluble in blood than helium Due to high pressure deep under the sea, nitrogen and oxygen react to give poisonous nitric oxide. Nitrogen is highly soluble in wateer
16 The noble gas used or treatment of cancer is Helium Argon Radon Krypton
17 The oxidation state of Pt in Xe+ [Pt F6] is +4 +5 +6 None of these
18 The first noble gas compound was XeO3 XeF4 XeF6 Xe +[PtF6]
19 Noble gases are used in discharge tubes to give different colours. Raddish orange glow is due to. Ar Ne Xe Kr
20 Pick out the incorrect statement for Xe F6 XeF6 is hydrolyzed practically to form XeOF4 It reacts with SiO2 to form Xe F4 On complete hydrolysis, it forms XeO3 It acts as F acceptor when treated with alkali metal fluoride, but cannot act as F donor to form complexes.
21 Pick out the incorrect statement for XeF4 XeF4 disproportionate violently with water It is used as fluorinating agent It has octahedral structure for geometry It oxidizes I to I<sub>2</sub>
22 Which is incorrect statement for Xe F2. It has linear structure. It is hydrolyzed rapidly in aqueous solution of a base It oxidizes Cl and I to Cl2 and I 2 respectively It cannot act as F donor
23 The 'shape' of molecule ." Xe F6 is. Pentagonal bipyramidal Regular octahedral Distorted octahedral Square planar
24 Compounds formed when noble gasses get entrapped in the cavities of crystal lattices of certain organic and inorganic compounds are called. Interstitial compounds Hydrates Clathrates Picrates
25 Which of the following statements is not correct about noble gases. Their ionization energies are very high Their electron affinities are nearly zero They do not form any chemical compounds They are not easily liquefied
26 The increase in boiling points of noble gases from He to Xe is due to the Decreases in ionization energy Increases in polarizability Increase in electron affinity Increase in atomic volume
27 Noble gases are sparingly soluble in water owing to. Dipole -dipole interactions Dipole -induced dipole interactions Hydrogen bonding Induced dipole -instantaneous dipole interactions
28 Which one of the following noble gas is obtained by radioactive disintegrastion Kr Br Rn Xe
29 For the respiration of sea divers mixture is used. He &amp; O2 Ar &amp; O2 Ne &amp; O2 Kr &amp; O2
30 Helium is used for The preservation of food Filling electrical transformer Pressuring agent in rockets All of above
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