NAT II Physical Science Chemistry With Answers

NAT II Physical Science Chemistry

Sr. # Questions Answers Choice
1 If the solvent is inflammable for heating purpose we use Ice bath Water bath Wire gauze Thermostat
2 Which one is not usually used for the crystallization? Acetone Acetic acid Sulphuric acid Chloroform
3 Which one is the property of an ideal solvent? Should be expensive It should react chemically with the solute Impurities should crystallize along with the solute Should be safe to use
4 Gooch Crucible used to filter the solution of H<sub>2</sub>SO<sub>4</sub> HCI KMnO<sub>4</sub> Both B &amp; C
5 Gooch crucible is used for the filtration of precipitates having High Solubility High concentration High ignition temperature Low Temperature
6 By using the fluted filter paper rate of filtration is Increased Decreased Filtration is constant Having no effect
7 During the folding of filter paper the apex form angle of about 80° 60° 180° 90°
8 The pore size of filter paper depends upon Nature of the medium Temperature of the medium Size of particles Mass of the particles
9 Which of the following process is used to separate insoluble particles from liquids? Seperation Filtration Crystallization Condensation
10 Which of the following is directly related to Qualitative analysis? Identification Separation Measurement Calculation
11 If NAis Avogadro's number, then number of valence electrons in 4.2 g of nitride ions N3-is 2.4 N<sub>A</sub> 4.2 N<sub>A</sub> 1.6 N<sub>A</sub> 3.2 N<sub>A</sub>
12 2 g of oxygen contains number of atoms equal to that in 0.5 g of hydrogen 4 g of sulphur 7 g of nitrogen 2.3 g of sodium
13 The total number of protons in 10 g of calcium carbonate is (N0= 6.023 x 1023) 1.5057 x 10<sup>24</sup> 2.0478 x 10<sup>24</sup> 3.0115 x 10<sup>24</sup> 4.0956 x 10<sup>24</sup>
14 The number of oxygen atoms in 4.4 g of CO2 is approximately 1.2 x 10<sup>23</sup> 6 x 10<sup>22</sup> 6 x 10<sup>23</sup> 12 x 10<sup>23</sup>
15 The number of atoms contained in 11.2 L of SO2at S.T.P are 3/2 x 6.02 x 10<sup>23</sup> 2 x 6.02 x 10<sup>23</sup> 6.02 x 10<sup>23</sup> 4 x 6.02 x 10<sup>23</sup>
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