NAT II Biological Science Chemistry With Answers

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NAT II Biological Science Chemistry

Sr. # Questions Answers Choice
1 Which metal is protected by a layer of its own oxide? Al Ag Au Fe
2 Which is the most amphoteric? Na<sub>2</sub>O MgO Al<sub>2</sub>O<sub>3</sub> CaO
3 Aluminothermy used for on the spot welding of large iron structure is based upon the fact that As compared to iron, aluminium has greater affinity for oxygen As compared to aluminium, iron has greater affinity for oxygen Refraction between aluminium and oxygen is endothermic Reaction between iron and oxygen is endothermic.
4 Which of the following mineral does not contain Al? Cryolite Mica Feldspar Fluorspar
5 Which one of the following has the lowest boiling point? B Al Ga Ti
6 Which of the following is different from the other three oxides? MgO SnO ZnO Cr<sub>2</sub>O<sub>3</sub>
7 Bleaching action of bleaching powder is due to the liberation of O<sub>2</sub> OCl<sup>-</sup> Cl<sub>2</sub> Cl<sup>-</sup>
8 Dolomite has the composition KCL.MgCL<sub>2</sub>.6H<sub>2</sub>O Na<sub>3</sub>AIF<sub>6</sub> CaCO<sub>3</sub>.MgCO<sub>3</sub> CaCL<sub>2</sub>.MgCl<sub>2.</sub>6H<sub>2</sub>O
9 The wire in the flash bulbs is made up of Mg Ba Cu Ag
10 Portland cement is manufactured by using Limestone, clay and sand Limestone, gypsum and sand Limestone, gypsum and alumina Limestone, clay and gypsum
11 Magnesium keeps on burning in N<sub>2</sub> CO<sub>2</sub> N<sub>2</sub>O N<sub>2 </sub>as well as CO<sub>2</sub>
12 Calcium cyanamide on treatment with steam under pressure gives NH3and Calcium carbonate Calcium hydroxide Calcium oxide Calcium bicarbonate
13 The formula to calcium cyanamide is Ca(CN)<sub>2</sub> CaC<sub>2N</sub> CaNCN CaCHNH<sub>2</sub>
14 Setting of Plaster of Paris involves Oxidation with atmospheric Combination with atmospheric CO<sub>2</sub> Dehydration Hydration to yield another hydrate
15 Setting of cement is an Exothermic reaction Endothermic reaction Neither exothermic nor endothermic None
16 Which of the following compounds has the lowest anion to cation size ratio? LiF NaF Csl CsF
17 Which of the following alkali metal hydroxides is the strongest base? LiOH NaOH KOH CsOH
18 The formula of nitre is KNO<sub>3</sub> NANO<sub>2</sub> NaCl Na<sub>2</sub>CO<sub>3</sub>
19 Among alkali metal salts, the lithium salts are the poorest conductors of electricity in aqueous solution because of Easy diffusion of Li<sup>+</sup>ions Lower ability of Li<sup>+</sup>ions to polarize water molecules Lowest charge to radius ratio Higher degree of hydration of Li<sup>+</sup>ions
20 Sodium metal cannot be stored under Benzene Kerosene oil Alcohol Toluene
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