NAT II Biological Science Chemistry With Answers

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NAT II Biological Science Chemistry

Sr. # Questions Answers Choice
1 The pure crystalline substance on being heated gradually first forms turbid liquid at constant temperature and still at higher temperature turbidity completely disapp-ears. The behaviour is a characteristic of substance forming Allotropic crystal Liquid crystals Isomeric crystals Isomorphous crystals
2 The total pressure exerted by a number of non-reacting gases is equal to the sum of partial pressure of the gases under the same conditions is known as Boyle's law Charle's law Avogadro's law Dalton's law
3 The vapour density of a gas is 11.2. The volume occupied by 11.2 g of this gas at N.T.P. is 22.4 litres 11.2 litres 1 litre 2.24 litres
4 Wt. of 112 ml of oxygen at NTP on liquification would be 0.32 g 0.64 g 0.16 g 0.96 g
5 The weight of 11.2 litres of CO2at S.T.P. would be 88 g 44 g 32 g 22 g
6 The number of atoms in 0.004 g of magnesium is close to 24 2 x 10<sup>20</sup> 10<sup>20</sup> 6.02 x 10<sup>23</sup>
7 One mole of gas refers to The number of molecules in one litre of gas The number of molecules in one gram of gas The number of molecules contained in 12 grams of <sup>12</sup>C isotope The number of molecules in 22.4 litres of a gas at S.T.P.
8 The relative rates of diffusion of a gas (molecular weight = 128) as compared to oxygen is 2 times 1/4 1/8 1/2
9 The kinetic theory of gases predicts that total kinetic energy of a gaseous assemble depends on Pressure of the gas Temperature of the gas Volume of the gas Pressure, temperature, and volume of the gas.
10 Which of the following statement is correct if the intermolecular forces in liquids A, B and C are in the order A < B < C? B evaporates more readily than A B evaporates less readily than C A and B evaporates at the same rate A evaporates more readily than C
11 If the solvent is inflammable for heating purpose we use Ice bath Water bath Wire gauze Thermostat
12 Which one is not usually used for the crystallization? Acetone Acetic acid Sulphuric acid Chloroform
13 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
14 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
15 Gooch crucible is used for the filtration of precipitates having High Solubility High concentration High ignition temperature Low Temperature
16 By using the fluted filter paper rate of filtration is Increased Decreased Filtration is constant Having no effect
17 During the folding of filter paper the apex form angle of about 80° 60° 180° 90°
18 The pore size of filter paper depends upon Nature of the medium Temperature of the medium Size of particles Mass of the particles
19 Which of the following process is used to separate insoluble particles from liquids? Seperation Filtration Crystallization Condensation
20 Which of the following is directly related to Qualitative analysis? Identification Separation Measurement Calculation
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