PPSC Chemistry Full Book Test With Answers

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PPSC Chemistry Full Book Test

Sr. # Questions Answers Choice
1 In which pair of species, the Lewis formula contain same number of Lone pairs and bond pairs but they are not iso electronci. O2 B2 SO2, O3 PCl3, BF3 SOCl2, COCl2
2 In the Lewis formula of which of the following species, the number of single double and dative bonds are equal. N2O3 HNO3 SO2 SOCl2
3 The total number of bond pairs around sulphur and total number of lone pairs around oxygen atoms in the Lewis structure of sulphate ion are respectively. 4, 12 8,12 12,4 6 ,12
4 Which of the following element has six electrons in the valence shell but cannot exhibit a maximum co valency of six. Sulphur Oxygen Selenium Both A and B
5 Which element out of the following can ehibit a maximum con valency of seven. Chlorine Sulphur Fluorine both Cl and F
6 The Lewis formula of SOCl2 the total number of bond pairs and lone pairs of electrons around sulphur are. 2,1 2 ,2 3 ,1 3 ,0
7 In which pair of species, the Lewis formulae contain same number of ion pairs and bond pairs but they are not isoelectronic. O2, N2 SO2, O3 PCl3 , BF3 SOCl2, COCl3
8 In the Lewis formula of which of the following species, the number of single double and dative bonds are equal N2O5 HNO3 SO2 SOCl2
9 In the electronic structure of acetic acid,the total number of shared and unshaped pair of electrons are respectively. 16 ,8 8 ,4 12 ,8 8 ,12
10 Pi bond is formed By the overlapping of atomic orbitals on internuclear axis By transference of electrons By sidewise overlapping to half filled p orbitals By overlapping of s-orbitals with p orbitals
11 Which of the following is an example of super octet molecules. C1F3 IF7 PCl5 All the three
12 For covalent bond to form between two atoms A and B Transference of electrons must take place from A to B A pair of electrons of A is shared by both A and B A and B contribute equal no. of electrons for mutual sharing by A and B One of the atom A or B must already have octet of electrons.
13 The force responsible for dissolution of ionic compounds in water are Hydrogen bonds Ion dipole forces Ionic bonds Van Der Waal forces
14 Which element among the following cannot exhibit variable electronvalency <sub>29</sub>Cu <sub>50</sub>Sn <sub>25</sub> Mn <sub>38</sub> Sr
15 Which of the following configuration of an ionic species represents psedue noble gas configuration. ns2 ns2 np6 ns2 np6 nd 10 ns2 np3
16 The electrolysis of molten metal hydride will produce dihydrogen gas. At cathode At anode At both the electrodes At none of the electrodes
17 Which name is associated with the rules which help in predicting the portability of anion. Soddy Slater Fajan Linus pauling
18 Which halide of cesium will be highly ionic in nature. K+ Ag+ Rb+ Ca+
19 Which of the following parameter is not involved in calculations based on Born Haber Cycle. Ionization enthalpy Electron gain enthalpy Electronegativity Bond dissociation energy
20 The carbonate of which of the following will have highest lattice energy. Barium Magnesium Calcium Strontium
21 Among sodium phosphate, sodium sulphate and sodium chloride the solubility in water increases as. Chloride &gt; Phosphate &gt; Sulphate Sulphate &gt; Pohosphate&gt; Chloride Chloride &gt; Sulphate &gt; Phosphate Phosphate &gt; Chloride &gt; Sulphate
22 The electronic configuration of sodium (Z=11) 1s2, 2s2, 2p4 1s2, 2s2, 2p6, 3s2 , 2p5 1s2, 2s2, 2p6, 3s1 1s2, 2s2, 2p6, 3s2
23 Which among the following hydride is ionic in nature. Ammonia Protium oxide Calcium hydride Sulphane
24 Ionic compounds in general possess both High melting point and non -directional bonds High melting points and low boiling poinits Directional bonds and low boiling points High solubility in polar and non -polar bonds.
25 Solid sodium chloride does not conduct electricity be cause. In solid NaCl, no ions are present Solid NaCl is covalent in nature In solid NaCl, there is no mobility of ions In solid NaCl, there are no electrons.
26 Ionic reactions mainly take place in. Aqueous solutions and organic solvents of high polarity Non aqueous solvents of low polarity Gaseous state Solid state
27 Which of the following halide has lowest melting point. NaCl NaF NaBr NaI
28 Which of the following has the highest melting point. NaCl KCl MgO BaO
29 Among the solvents given below, with dielectric constant (E) given in parentheses which has highest solubility of KCI? Benzene (E=O) Carbon disulphide (E = O) Methanol (E =32) Acetone (E = 2)
30 Which of the following will exhibit variable electro Valency due to intert pair effect. Fe Sn K Both Fe and Sn
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