NAT II Biological Science Chemistry With Answers

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NAT II Biological 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
16 Bragg's law is given by equation n<span style="color: rgb(34, 34, 34); font-family: &quot;Times New Roman&quot;; font-size: 24px; text-align: center; background-color: rgb(255, 255, 248);"><i>λ</i></span>= 2<i></i><span style="color: rgb(34, 34, 34); font-family: &quot;Times New Roman&quot;; font-size: 24px; text-align: center; background-color: rgb(255, 255, 248);"><i>θ</i></span>sin<span style="color: rgb(34, 34, 34); font-family: &quot;Times New Roman&quot;; font-size: 24px; text-align: center; background-color: rgb(255, 255, 248);"><i>θ</i></span> n<span style="font-family: &quot;Times New Roman&quot;; font-size: 24px; color: rgb(34, 34, 34); text-align: center; background-color: rgb(255, 255, 248);"><i>λ</i></span>= 2 d sin<i style="text-align: center;">θ</i> 2 n<span style="font-family: &quot;Times New Roman&quot;; font-size: 24px; color: rgb(34, 34, 34); text-align: center; background-color: rgb(255, 255, 248);"><i>λ</i></span>= d sin<i style="text-align: center;">θ</i> n<span style="font-family: &quot;Times New Roman&quot;; font-size: 24px; color: rgb(34, 34, 34); text-align: center; background-color: rgb(255, 255, 248);"><i>λ</i></span>= 1/2 d sin<i style="text-align: center;">θ</i>
17 In crystal structure of sodium chloride, the arrangement of CI-ions is Fcc Both Fcc and bcc Bcc None of these
18 Crystal can be classified in to -------------- basic crystal habits 7 3 14 3
19 Ionic solids with defects, contain Equal number of cation and anion vacancies Interstitial anions and anion vacancies Cation vacancies only Cation vacancies and interstitial cations
20 Which of the following is an example of body centred cube? Magnesium Zinc Copper Sodium
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