Chemistry MCQs

Page No. 9

The most appropriate method for separating a large quantity of a mixture of nonvolatile, nonpolar organic compounds would be__________?


aDistillation


bExtraction


cGas chromatography


dColumn chromatography


View Answer Column chromatography

The law which states that the amount of gas dissolved in a liquid is proportional to its partial pressure is___________?


aDalton’s law


bGay Lussac’s law


cHenry’s law


dRaoult’s law


View Answer Henry’s law

The molecules of which gas have highest speed?


aH2 at -73oC


bCH4 at 300 K


cN2 at 1,027oC


dO2 at 0 K


View Answer H2 at -73oC

The metallurgical process in which a metal is obtained in a fused state is called__________?


asmelting


broasting


ccalcinations


dfroth floatation


View Answer smelting

The number of d-electrons in Fe2+ (Z = 26) is not equal to that of____________?


ap-electrons in Ne(Z = 10)


bs-electrons in Mg(Z = 12)


cd-electrons in Fe(Z = 26)


dp-electrons in CI(Z = 17)



Which of the following phenomenon is considered responsible for Global Warming?


aGreenhouse effect


bFire in coal mines


cDry farming


dMonsoon


View Answer Greenhouse effect

The heat energy produced when the human body metabolises 1 gram of fat is__________?


a30 KJ


b1 KJ


c39 KJ


d29 KJ


View Answer 39 KJ

The Latin word formica means ant. The name formic acid is derived from this Latin word because__________?


athis acid, in ancient times, was used to eliminate ant-hills


bthis corrosive acid is secreted by ants to drive away their enemies


cthis acid was first obtained by the distillation of ants


dants are attracted by the odour of this acid



The octane number of zero is assigned to____________?


a2-methyl octane


bn-heptane


ciso octane


d3-methyl octane


View Answer n-heptane

The mass of P4O10 that will be obtained from the reaction of 1.33 gram of P4 and 5.07 of oxygen is___________?


a2.05 gram


b3.05 gram


c4.05 gram


d5.05 gram


View Answer 3.05 gram

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