Chemistry: Solved 165 Chemistry Questions and answers section with explanation for various online exam preparation, various interviews, Logical Reasoning Category online test. Category Questions section with detailed description, explanation will help you to master the topic.
1. Which of the following is the most used semiconductor?
Semiconductor â€“ A solid substance that has a conductivity between that of an insulator and that of most metals, either due to the addition of an impurity or because of temperature effects. Devices made of semiconductors, notably silicon, are essential components of most electronic circuits.
3. Which of the following is a polymer of chloroethene?
Correct Ans:Polyvinyl chloride (PVC)
A polymer is a substance which is made up of monomers. Here, the polymer of chloroethene is PVC. The monomer of nylon is caprolactam, terylene are ethylene glycol and terephtalic acid and the monomer of polystyrene is styrene.
Classification of elements entails the arrangement of the known elements in certain groups in such a away so that elements with similar properties are grouped together. Mendeleev is considered as the father of periodic table. He gave a law according to which the physical and chemical properties of the elements are the periodic function of their atomic masses. Base on this the periodic table was tabulated.
6. Isotones are atoms of different elements having a same number of ________?
Fundamental particles of an atom are Electron, proton and neutron. Neutron had been discovered by James Chadwick. It has zero charge and mass 1.00863 amu. Isotones are atoms of different elements having the same number of neutrons. 146<./sub>C, 157N,168O.
8. What conversion of state happens during sublimation?
Correct Ans:Solid to gaseous
Sublimation is one of the methods of separation of mixtures. During sublimation, a solid substance directly passes into its vapors, on application of heat. The vapors upon cooling give back original substance. Some example of sublimes are- Naphthalene, Iodine, Ammonium Chloride etc.
11. The process of covering water pipes made of Iron with Zinc layer to prevent corrosion is called:
Galvanization, or galvanisation is the process of applying a protective zinc coating to steel or iron, to prevent rusting. The most common method is hot-dip galvanization, in which parts are submerged in a bath of molten zinc.
16. Automobile exhaust leads to a poisonous pollutant
Correct Ans:Carbon Monoxide
Main motor vehicle emissions are NOx, Volatile organic compounds, Ozone, Carbon monoxide (CO), Hazardous air pollutants (toxics), Particulate matter (PM10 and PM2.5), Carbon dioxide (CO2) and Water vapor. Out of this Carbon monoxide is the poisonous gas.
19. Bleaching powder is prepared by passing ________.
Correct Ans:Chlorine over slaked lime
Bleaching powder is prepared by passing gas state of chlorine over dry slaked lime, this process will gives bleaching powder. Bleaching powder is prepared on a large scale by passing the chlorine gas through a solution that contains calcium hydroxide.
First NASA Goddard Space Flight Centre confirmed the presence of Methane in the atmosphere of Mars. In 2014, Mars Express Orbiter and Canada France Telescope at Hawaii further confirmed the presence of methane on Mars.
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