November 5, 2018

Chemistry One Liner For WBCS Preliminary Exam

1)Anthracite coal produces most heat per unit.
2)Wet wood will become use less soon after exposing in the open air.
3)Baryllium sulphate is less soluble in water due to high inflammable energy.
4)Cement is made hard with dehydration.
5)Energy is always released when a chemical bond is formed.
6)Maximum iron ore is found in Fe2O3 state.
7)‘’All the four quantum numbers of two electrons in an atom are not the same’’ it is the law of Exclusion principle of pauli.
8)Sodium Benzoate is used for preservation of food grains.
9)Commercial nitric acid is coloured because it contains dissolved Nitrous oxide.
10)Fertiliser having high nitrogen content is Urea.Chemical Formula CH4N2O.
11)The three elements most needed in common fertilizers are Nitrogen, Potassium and Phosphorous.
12)Oxygen that keeps us alive come from carbon dioxide.
13)Carbon dioxide gases is present under pressure in soft drinks.
14)Type metal does not expand on going from liquid state to solid state.
15)Boyle’s law holds good for any gas at low line temperature and hight pressure.
16)Chemical that is used in making artificial rain is silver nitrite.
17) Uranium is commonly used in nuclear for producing electricity by nuclear fission.
18)Table salt gets moist during rainy season because sodium chloride contains hygroscopic impurities like magnesium chloride.
19)Graphite is used as a lubricant in heavy machines.
20)The plastic material commonly used for making
gear wheels is Polystyrene.
21)The anode in a dry cell consists of cadmium.
22)Sodium iodide is used to iodise common salt.
23)Curie” is unit of Radioactivity.
24)The enzyme that converts glucose to ethyl alcohol is Maltase.
25)J. Robert Oppen Heimer had developed Hydrogen Bomb.
26)The source of sun’s energy is the process of thermionic emission.
26)Nitric acid is the acid used in lead storage cells.
27)Electron microscope was introduced by Knoll and Ruska. In 1931
28)A gas thermometer is more sensitive than a liquid thermometer because a gas expands more than a liquid.
29)Crooks glass is used for sun glasses.
30) ‘Milk of Magnesia’ is a suspension of magnesium hydroxide.

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