Study Material for Railways Group D, ALP, SSC Exams, Insurance Exams and other Competitive Exams – Chemistry Notes
Railway Recruitment Board has scheduled Group D Exam from 17th September 2018. To help you with your preparation we are providing Railway Group D Study Material and Notes. Here you can get notes for General Science, Current Affairs, General Knowledge, Reasoning and Quantitative Aptitude. The study material provided here will help to cover major topics for Railways Group D, ALP, SSC Exams, Insurance Exams and other Competitive Exams. You can also download PDF of the study material provided here.
Important Elements and Their Symbols
⦁ Aluminium – Al
⦁ Argon – Ar
⦁ Arsenic – As
⦁ Barium – Ba
⦁ Beryillium – Be
⦁ Boron – B
⦁ Bromine – Br (Liqiud non – metal)
⦁ Cadmium – Cd
⦁ Carbon – C
⦁ Cesium – Cs
⦁ Chlorine – Cl
⦁ Chromium – Cr
⦁ Cobalt – Co
⦁ Fluorine – F
⦁ Gallium – Ga
⦁ Gold – Au
⦁ Helium – He
⦁ Hydrogen – H
⦁ Iodine – I
⦁ Iron – Fe
⦁ Lithium – Li
⦁ Magnesium – Mg
⦁ Manganese – Mn
⦁ Mercury – Hg
⦁ Nickel – Ni
⦁ Oxygen – O
⦁ Potassium – K
⦁ Silicon – Si
⦁ Silver – Ag
⦁ Sodium – Na
⦁ Sulphur – S
⦁ Tin – Sn
⦁ Tungsten – W
⦁ Vanadium – V
⦁ Zinc – Zn
Important Terms
⦁ Calcination – Process of heating the concentrated ore in absence of air.
⦁ Roasting – The process of heating ore in excess air.
⦁ Smelting – Process by which roasted ore is mixed with coke and heated.
⦁ Quenching – Heating steel to bright redness and then suddenly cooling down in water or oil.By this process steel becomes extraordinarily hard and brittle.
⦁ Tempering – By Controlled heating of quenched steel its brittleness can be removed without affecting its hardness.
⦁ Annealing – Steel is heated to a temperature below red hot and the cooled turns it soft and the process is called annealing.
Alloys
⦁ Magnesium – Aluminium and Magnesium
⦁ Duralumin – Aluminium , Copper, Magnesium and Manganese
⦁ Brass – Copper and Zinc
⦁ Bronze – Copper and Tin
⦁ Gun metal – Copper , Tin aand Zinc
⦁ Coinage alloy – Copper and Nickel
⦁ Solder – Lead and Tin
⦁ Stainless Steel – Iron Carbon Chromium and Nickel
⦁ Tungsten Steel – Iron, Tungsten, Chromium, and Carbon.
Natural Acids
⦁ Acetic acid – Vinegar
⦁ Amino acid – Protien
⦁ Ascorbic acid – Vitamin C
⦁ Citric acid – Lemon / citrus fruit
⦁ Hydrocholric acid – Digestive juices
⦁ Lactric acid – Milk
⦁ Malic acid – Unripe apples / fruits
⦁ Tannic Acid – Tea
⦁ Uric Acid – Urine
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