NAT II Physical Science Chemistry With Answers

NAT II Physical Science Chemistry

Sr. # Questions Answers Choice
1 Addition of iron fillings to CuSO4solution caused precipitation of Cu owing to the Reduction of Cu<sup>2+</sup> Oxidation of Cu<sup>2+</sup> Reduction of Fe Reduction of Fe<sup>3+</sup>
2 Bell metal is an alloy of Cu, Zn and Sn Cu, Zn and Ni Cu and Zn Cu and Sn
3 The structure of XeF6 Distorted octahedral Pyramidal Tetrahedral None of the above
4 Helium-oxygen mixture is used by deep sea divers in preference to nitrogen-oxygen mixture because Helium is much less soluble in blood than nitrogen Helium is much less soluble in blood than helium Under the sea nitrogen and oxygen react to give poisonous nitric oxide Nitrogen is highly soluble in water.
5 The following has zero valency Na Be Al Kr
6 A clathrate may be defined as a Cage compound Liquid crystal Mixture Solid solution
7 Which of the following fluorides of xenon is impossible? XeF<sub>2</sub> XeF<sub>3</sub> XeF<sub>4</sub> XeF<sub>6</sub>
8 The spectrum of helium is expected to be similar to that of H Li<sup>+</sup> Na He<sup>+</sup>
9 The density of nitrogen gas prepared from air is slightly greater than that of nitrogen prepare by a chemical reaction form a compound of nitrogen due to the presence of the following in aerial nitrogen. Argon CO<sub>2</sub> Some nitrogen molecules analogous to O2 Greater amount of nitrogen molecules derived from N<sup>15</sup>isotope.
10 Which of the following is monoatomic? Oxygen Neon Fluorine Nitrogen.
11 If one litre of air is passed repeatedly over heated copper and magnesium till no further reduction in volume takes place, the volume finally obtained would be approximately 800mL 200mL 10mL Zero
12 The last orbit of argon would have electrons 8 18 2 6
13 Which for the following has greatest reducing power? Hl HBr HCl Hl
14 Which of the following belongs to the halogen family? Francium Polonium Radium Astatine
15 Fluorine does not show positive oxidation states due to the absence of d-orbitals s-orbitals p-orbitals None
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