Chemistry
1-Electric bulbs are filled with Argon.
2-The purest form of iron is Wrought iron
3-The anode of a dry cell is made up of Zinc
4- Helium gas is filled in balloons because it is lighter than air
5-Non-Stick Kitchen wares are coated with Teflon
6-The isotopes used for the production of atomic energy is U-235
7-The material used in the manufacture of lead pencil is Graphite
8-Detergents are Sodium salts of sulphonic acids
9-The noble gas used in radiotherapy is Radon
10-Hydrogen Bomb is based on the principle of uncontrolled fusion reaction
11-Oxides of sulphur and carbon released during combustion of fuels dissolve in rain water to give acid rain
12-Liquefied Petroleum gas (LPG) burns with a Non-Luminous flame
13- The technique of calculating the age of fossil organisms is Radioactive Dating
14- Charcoal is used in water treatment as a Adsorbent
15-The chemical used to developing Photographic films is Silver Bromide
16- The lightest radioactive element is Tritium
17-Alcohol prepared by the distillation of wood is Methyl Alcohol
18-The process by which milk is converted to curd is called Fermentation
19-The most common cause of pollution of air is Sulphur Dioxide
20-Lignite is known as BROWN COAL
21-One carat of diamond is equal to 200mg
22-Iron is extracted from Haematite
23-Graphite is used as a moderator in nuclear reactors
24- Milk is Emulsion
25-The two metal ions that cause hardness to water are Calcium , Magnesium
26-The chemical substance present in bones and teeth Calcium Phosphate
27- The Green House Effect is produced due to the presence of excess amount of Methane
28-If the lime water is kept in the air , it turns milky due to presence of Carbon Dioxide
29-The National Chemical Laboratory (India) is located in Pune
30-Diamond is harder than graphite because of difference in layers of atoms