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Chemical compounds can be broadly classified into three categories Acids,Bases and Salts. ACIDS The word acid is derived from a Latin word 'acere' or 'acidus' meaning'sour'. All acids have one property in common that is they all are sour in taste. Most people think that acids are fuming corrosive dangerous liquids. However all acids are not like this.e.g.vinegar contains acetic acid and it is used to preserve the food.(pickles). Classification of acids    ORGANIC ACIDS: The acids produced by the plants and animals are known as organic acids. Eg.acetic acid, oxalic acid, tannic acid etc. MINERAL ACIDS: These are prepared in laboratories and are corrosive in nature. Eg. Hydrochloric acid, Sulphuric acid and Nitric acid. PROPERTIES OF ACIDS 1. They have a sour taste. 2. They are corrosive in nature. Most acids especially the strong ones can burn our skin and react with many materials are corrosive liquids and also destroy paper and clothes.

Every living organism is made up of small  basic  units called 'cell'. A cell is called as a basic structural and functional unit of an organism. The cells are the building blocks of a body. The size of a cell is very very small starting from 0.5 microns to 1 micron . The smallest cell is a bacterial cell which is 0.5 micron whereas the biggest cell is an ostrich egg cell which is 18cm×17cm.  Every cell has its own particular structures called organelles which are very very important because each carry out their own specific function. A typical cell consists of the following organelles: NUCLEUS: The central dark black color spot present in the cell is called nucleus.  It is also called as "CONTROL ROOM OF THE CELL".  It has all genetic material which can be either DNA or RNA . This genetic material is responsible for passing the characters from parents to children. The nucleus is also involved in cell division. CYTOPLASM: The fluid present inside the cell which holds