| S. No. | Acid | Product |
| 1 | Acetic acid | vinegar |
| 2 | Formic acid | ant bite |
| 3 | Citric acid | lemon, orange |
| 4 | Lactic acid | curd |
| 5 | Oxalic acid | spinach |
| 6 | Ascorbic acid | citrus fruit |
| 7 | Tartaric acid | tamarind, grapes |
Copper name was derived from its birth place Cyprus.
Mercury is the only metallic element that is in liquid form. Its also known as quicksilver.
Radium was discovered by Marie Curie and Pierre Curie in 1898.
Antoine Henry Becquerel discovered the phenomenon of radioactivity in 1896 in Paris. He left an unexposed photographic plate near Uranium salt K2UO2(SO4)2 (potassium uranyl sulfate) and later found it to be exposed by some invisible rays.
Match stick was made by dipping pine wood in sulfur. Modern match box was made 200 years ago. Antimony trisulphate, Potassium Chlorate and white phosphorus with gum and starch was made to stick in wood. Due to inflammable property nowadays antimony trisulphate and potassium sulphate are used in match stick
Global warming
Our earth is protected by harmful ultraviolet rays of sun by a protective layer of ozone (O3). Due to pollutants like SO2 and NO2 and chlorofluoro carbon a hole is formed in the ozone layer of atmosphere. Harmful ultraviolet rays of atmosphere penetrate earth causing a rise in temperature. Due to rise in temperature the snow starts to melt. Water level of sea and the average temperature of mother earth rise.
Layers of atmosphere
- Troposphere – All weather condition like rain frost etc take place upto13 km
- Stratosphere -consists of ozone which protect from ultraviolet ray
- Mesosphere – a layer of 80 Km, burns all mentors and meteorites
- Ionosphere – a 80-400 km layer, helps in transmission of mobile, TV rays.
- Exosphere – A thin layer made of hydrogen and helium. Not much is known of this layer
Learn basic chemistry 