NAT II Biological Science Chemistry With Answers

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NAT II Biological Science Chemistry

Sr. # Questions Answers Choice
1 Rusting of iron is catalysed by Fe O<sub>2</sub> Zn H<sup>+</sup>
2 Which has largest radius? CO<sup>3+</sup> Mn<sup>3+</sup> Fe<sup>3+</sup> Cr<sup>3+</sup>
3 Which of the following metal exhibits more than one oxidation? Na Mg Fe Al
4 Which of the following transition metal ions will have definite value of magnetic moment? Sc<sup>3+</sup> Ti<sup>3+</sup> Cu<sup>+</sup> Zn<sup>2+</sup>
5 Iron, once dipped in concentrated H2SO4, does not displace copper from copper sulphates solution, because It is less reactive than copper A layer of sulphates is deposited on it An inert layer of iron oxide is deposited on it. All valence electrons of iron are consumed.
6 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>
7 Bell metal is an alloy of Cu, Zn and Sn Cu, Zn and Ni Cu and Zn Cu and Sn
8 The structure of XeF6 Distorted octahedral Pyramidal Tetrahedral None of the above
9 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.
10 The following has zero valency Na Be Al Kr
11 A clathrate may be defined as a Cage compound Liquid crystal Mixture Solid solution
12 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>
13 The spectrum of helium is expected to be similar to that of H Li<sup>+</sup> Na He<sup>+</sup>
14 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.
15 Which of the following is monoatomic? Oxygen Neon Fluorine Nitrogen.
16 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
17 The last orbit of argon would have electrons 8 18 2 6
18 Which for the following has greatest reducing power? Hl HBr HCl Hl
19 Which of the following belongs to the halogen family? Francium Polonium Radium Astatine
20 Fluorine does not show positive oxidation states due to the absence of d-orbitals s-orbitals p-orbitals None
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