NAT I Engineering Chemistry With Answers

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NAT I Engineering Chemistry

Sr. # Questions Answers Choice
1 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>
2 Calcium cyanamide on treatment with steam under pressure gives NH3 and <span style="font-size: 14.44444465637207px;">Calcium carbonate</span> <span style="font-size: 14.44444465637207px;">Calcium hydroxide</span> <span style="font-size: 14.44444465637207px;">Calcium oxide</span> <span style="font-size: 14.44444465637207px;">Calcium bicarbonate</span>
3 The formula of calcium cyanamide is Ca(CN)<sub>2</sub> CaC<sub>2</sub>N CaNCN CaCHNH<sub>2</sub>
4 Setting of plaster of paris involves Oxidation with atmospheric oxygen Combination with atmosphere CO<sub>2</sub> Dehydration Hydration to yield another hydrate.
5 Setting of cement is an Exothermic reaction Endothermic reaction Neither exothermic nor endothermic None
6 Which of the following compounds has the lowest anion to cation size ratio? LiF NaF CsI CsF
7 Which of the following alkali metal hydroxides is the strongest base? LiOH NaOH KOH CaOH
8 The formula of nitre is KNO<sub>3</sub> NaNO<sub>3</sub> NaCI Na<sub>2</sub>CO<sub>3</sub>
9 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.
10 Sodium metal cannot be stored under Benzene Kerosene oil Alcohol Toluene
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