NAT II Physical Science Chemistry With Answers

NAT II Physical Science Chemistry

Sr. # Questions Answers Choice
1 Water (H2O) is liquid while hydrogen sulphide (H2S) is a gas because Water has higher molecular weight Hydrogen sulphide is a weak acid Sulphure has high electronegativity than oxygen Water molecules associate through hydrogen
2 The valence orbital configuration of an element with atomic number 23 is 3d<sup>5</sup> 3d<sup>3</sup>, 4s<sup>2</sup> 3d<sup>3</sup>, 4s<sup>1</sup>, 4p<sup>1</sup> 3d<sup>2</sup>, 4s<sup>2</sup>, 4p<sup>1</sup>
3 Which quantum number is sufficient to describe the electron is hydrogen <div><span style="background-color: rgb(255, 255, 248); color: rgb(34, 34, 34); font-family: &quot;Times New Roman&quot;; font-size: 24px; text-align: center;"><i>ι</i></span></div> n m s
4 When electrons revolve in stationary orbits, There is no change in energy level They vecome stationary They are gaining kinetic energy There is increase in energy
5 The symbol of the element whose atoms have the outer most electronic configuration 2s2sp3is N Li P Na
6 The number of electrons in the M shell of the element with atomic number 24 is 24 12 13 8
7 The maximum number of electrons in a subshell for whichι = 3 is 14 10 8 4
8 The ratio of the ionization energy of H and Be3+is 1 : 1 1 : 3 1 : 9 1 : 16
9 The mass of the neutron is of the order of 10<sup>-23</sup>kg 10<sup>-24</sup>kg 10<sup>-26</sup>kg 10<sup>-27</sup>kg
10 The credit of discovering neutron goes to Rutherford Langmuir Chadwick Austen
11 With increasing principle quantum number, the energy difference between adjacent energy levels in H atom Decreases Increases Remain constant Decreses for low value of Z and increases for higher value of Z.
12 The ratio of close packed atoms to tetrahedral holes in cubic close packing is 1 : 1 1 : 2 1 : 3 2 : 1
13 Potassium crystallizes with a Orthogonal lattice Cubic lattice Triclinic Ortho rhombic lattice
14 How many kinds of space lattices are possible in a crystal? 23 7 230 14
15 In a crystal a≠b≠c, a =γ= 90° andβ≠90°. It is Monoclinic Rhombic Trigonal Tetragonal
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