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 statement is not true for carbon. Its forms compounds with multiple bonds Its ionization energy is very high It undergoes catanation It shows inert pair effect
2 The most stable oxidation state shown by lead is. +2 , +4 +2 only +3 , +4 +4 only
3 Inert pair effect is best shown by Si Z Sn Pb
4 Which of the ionic possesses highest bond energy. C-C Si -Si Ge - Ge Sn -Sn
5 The metallic character of group 14 elements Decreases from top to bottom Increases from top to bottom Does not change gradully Has no significance
6 Catenation is a process of. Formaton of cations Deposition of cations Formation of long chain of identical atoms Formation of covalent bond
7 Elements of group 14 Exhibit oxidation state of -4 Exhibit oxidation state of +4 From M3+ and M4+ ions Form M4- and M4+ iona
8 Elements of group 14 have the electronic configuration of their outer shell as ns2 np3 ns2 np2 ns2 np6 ns2
9 Which of the following compounds would be most ionic to charcter. PbCl4 PbCl2 SnCl4 SnCl2
10 Which of tetra chloride is resistant to hydrolysis. CCl4 SiCl4 GeCl4 SnCl4
11 Pick out the incorrect statement The geometry around 'N' atom in trimethylamine is pyramidal The geometry around N atom in trisilylamine is planar The nitrogen atim is trimethylamine is sp2 hybridized whilst in trisilylamine it is sp2 hybridized Trisilylamine has donor properties whilst trimethylamine has no donor properties.
12 Which among the following is a false statement. SiO2 has a structure similar to that of CO2 Natural Si exists only in the combined state Si can be prepared by reducing SiO2 with Mg Si does not exist in graphite like structure, but exists only ni diamond like structure.
13 Which of the following carbides reacts with H2O to form propane. Al4C3 CaC2 SiC2 Sic
14 Graphite is a good conductor of electricity because is. Has sp2 hybridized carbon stoms Has free electrons Is crystalline Has free atoms
15 The nature of bonds in compounds of carbon and silicon is mostly Covalent Electrovalent Metallic Both A and B
16 A general trend in the properties of elements of carbon family shows that with increase in atomic number. The tendency towards concatenation increases The tendency to show +2 oxidation state increase Metallic character decreases The tendency to form complexes with convalency higher than four decreases.
17 Glass obtained by placing a layer of butyral plastic with a suitable adhesive between two layers of glass and cementing them by heat and pressure is called. Glass wool Safety glass Optical glass Jena glass
18 Any substance which has solidified from the liquid state with crystallization is known as Steel Fibre Glass Asbestos
19 Setting of cement is improved by Lime stone Clay Gypsum Water
20 In manufacturing of cement crystallization of amorphous dehydration products of clay 500 <sup>o</sup>C to 800 <sup>o</sup>C 900 <sup>o</sup>C to 1200<sup>o</sup>C 1250 <sup>o</sup>C ti 1400 <sup>o</sup>C 1000 to 1100 <sup>o</sup>C
21 In average composition of a good sample of cement the percentage of silica is. 18.5% 20.5% 22.5% 24.5%
22 Sodium silicate is used In the paint industry For fixing labels to glass In a soap industry All above
23 Sodium silicate is ued In fire proofing of wood and textiles As a preservative of eggs As a furniture polish All above
24 Is a chain silicate Olivine Tremolite Beryl Zeolite
25 Hemimorphite is an example of. Orthosilicate Pyrosilicate Cyclic silicate Meta silicate
26 Are used as water repellents Carbides Silicon Silicones Silicates
27 Carbides because of their hardness are Ionic carbides Interstitial carbides covalent carbides Any of above
28 Types of carides Ionic carides Covalent carbides Interstitial carbides All above
29 The rising world temperature will have serious effect on. Agriculture Animal production Human being All above
30 During the last two centuries, the atmospheric CO2 contents are increased by 15% 25% 35% 50%
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