PPSC Chemistry Full Book Test With Answers

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PPSC Chemistry Full Book Test

Sr. # Questions Answers Choice
1 Green houses are responsible for keeping our plant warm and sustaining life on the earth. CO2 & water vapours CO2 & CFC CO2 & H2O CO2 & CH4
2 The gases that are responsible for green house effect are. CO2 & CH4 CFC N2O All above
3 Tetra halides do not undergo hydrolysis C Si Sn Pb
4 Has maximum property of catenation. C Si Sn Pb
5 Allotropic form of tin White tin Grey tin Rhomic tin All above
6 Most electronegative element is. C Si Pb Sn
7 Shows a regular increase on moving down the group form carbon to lead Atomic volume Atomic radius Density All above
8 Ionization potential of carbon is. 11.2 7.8 8.1 7.3
9 The penultimate shell of carbon contains electrons. s2 s2p6 s2p6d10 s2p6d8
10 Main constituent of all inorganic matter Carbon Silicon Tin Lead
11 Group IV A consist of elements 3 4 5 6
12 In diborane (B2H6) The structure is similar to that of C2H6 All the atoms are in one plane The born atoms are linked through hydrogen bridges There is a direct boron boron bond
13 Alumina is not used as Refractory material A medium in chromatography An abrasive A White pigment
14 The aluminium alloy used to make parts of aircrafts is. Magnalium <div>Aluminium bronze</div> <div>Duralumin</div> All of the these
15 BCl3 is a planar molecule because B atom is. sp2 hybridized Sp3 hybridized sp hybridzed sp3 d hybridized
16 Mangalium is an alloy of. Al + Mg Mg + Ai + Mn Mg + Ai + Cu Mg + Ai + Cu + Mn
17 Duralumin is an alloy of. Mg + AI Ai+ Mg+Mn Mg + Ai + Cu Mg + Ai + Cu + Mn
18 Which of the following is not an alum. KAI (SO4)3 12 H2O NaAI (SO4)2 12 H2O NH4Fe (SO4)2 12H2O FeAl (SO4)2 . 12 H2O
19 Aluminothermy used for on the spot welding of large iron structures is based upon the fact that. As compared to iron, aluminium has greatest affinity for oxygen. As compared to aluminium, iron has greater affinity for oxygen Reaction between aluminim and oxygen endothermic Reaction between iron and oxygen is endothermic
20 Cryolite is used in the electrolytic extraction of aluminium to. Obtain more aluminium Reduce alumina Protective electrodes Dissolve bauxite and increase the electrical conductivity
21 Which of the following statement is true. Ferromagnetic separation is used to remove rion impurities from bauxite. Aluminium is an amphoteric element which means that it can act as an oxidizing agent and as a reducing agent Aluminium has a strong attinity for oxygen Aluminothermic reactions are endothermic
22 Which metal burns in air at high temperature with the evolution of much heat. Cu Hg Pb Al
23 Boric acid is added to glass because is. Makes the glass opalescent Reduces the coefficient of expansion Makes the glass brittle Increase refractive index of the glass.
24 The chief ore of aluminium is. Cryolite Bauxite Kaolin Carnalite
25 Which of the following hydroxide is amphoteric. B(OH)3 Al(OH)3 Ga (OH)3 In (OH)3
26 AI Cl3 acts as a strong Lewis acid, because it is. A covalent compound Readily hydrolyzed Electron deficient An ionic compound
27 The compound which does not act as Lewis acid is. BF3 AlCl3 BeCl2 SnCl4
28 Which one of the following elements shows the most stable oxidation state of +1 AI Ga In TI
29 Boron and aluminum halides are electron deficient compounds in this respect. they act as. Lewis acid Lewis base Oxidizing agent Reducing agent
30 Aluminium hydroxide is. An acid An amphoteric hydroxide A base An explosive hydroexide
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