PPSC Chemistry Full Book Test With Answers

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PPSC Chemistry Full Book Test

Sr. # Questions Answers Choice
1 Used in TV sets and sound movies to give ready response to electrical potential He Ne Ar Kr
2 Neon is used in neon signs for advertising purpose because. Neon lights are visible from long distance Neon light are visible though fog & mist Both A and B None of the above
3 To increase the life of filament and to low the heat conductivity a mixture in filled in electric bulb. Ar & N2 Ar & Kr Kr & N2 Xe & N2
4 Used in Geiger counter to detect radioactivity He Ne Ar Kr
5 Argon is used in filling of. Discharge tubes Luminous tube Fluorescent tubes None of above
6 Used in producing intense light in cinematography Xenon Krypton Radon Helium
7 Used in filling luminous tubes. Xenon Krypton Radon Helium
8 The noble gases are used due to having property Chomical inertness Low boiling point Any of a or b Both a and b
9 Of all the noble gaes, easily available gases are He & Ar He & Ne Ne & Ar Xe & Kr
10 In XeF2 molecules, Xe atom undergoes hybridization spd sp2 sp3 sp3d
11 Xenan hexaflouride at 47.7 oC is Colorless solid yellow solid Yellow liquid Colorless liquid
12 Explosive trioxide XeO3 is produced when XeOF4 reacts with water XeOF4 reacts with silica XeF4 reacts with water Any of above statements
13 One of the best fluorinating agent is XeF2 XeF4 XeF6 None of above
14 XeF4 is obtained, when a mixture of Xenon and fluorine in the ratio is heated in a nickle vessel at 400 oC 1 : 3 5 :1 1 :20 1 :5
15 Xenon diflouride is obtained by irradiating a mixture of xenon and fluorine with light from a high pressure. Mercury arc Tungeston arc Xenon arc None of above
16 The inert gasses AR, Ka, and Xe form solid compounds with certain organic molecules under pressure.. Halides Hydrates Clathrates All of above
17 The inert gases Ar, Kr and Ke form compounds with water at low temperature and high pressure. These compounds are called. Halides Hydrates Clathrates All of above
18 Radon is obtained only in the radioactive decay of Radium Thorium Actinium Any of above
19 Helium contents in the atmosphere by volume. 0.0005% 0.0015% 0.0001% 0.00001%
20 The noble gases are found in the atmosphere to the extent of about some percent by volume. 0.5% 1.0% 1.5% 2.0%
21 Principal constituents of noble gases is Argon Neon Xenon Helium
22 Zero group elements are called as Inert gases Rare gases Noble gases All of above
23 Zero group of the periodic table consists of. Four elements Five elements Six elements Eight elements
24 The structure of SO2 Linear Angular V-shaped Planner
25 The formula of sulphur sequioxide SO4 S2O7 S2O3 SO3
26 Electronegativity of Oygen is. 2.5 3.5 2.4 2.1
27 Group IV A consist of elements. 3 4 5 6
28 The correct increasing order of bond dissociation energy for N2, O2, F2 and Cl2 is N2 < O2 < F2 < Cl2 F2 < Cl2 < O2 < N2 F2 < Cl2 < N2 < O2 N2 < Cl2 < F2 < O2
29 Fluorine does not show variable oxidation state because of. its high electronegativity Its small sixe low dissociation energy of F-F bond Non availability of d-orbitals
30 Halogens are coloured because. They are strong oxidant Their molecules are held together by weak van der Waals forces Their atoms absorb radiations form visible range causing the excitation of valence electrons to higher energy of levels Their molecules absorb light radiation forming the oxcited state.
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