Chemistry
The main use of salt in the diet is to

make the taste of food better
increase the solubility of food particles in water
ease the process of cooking
produce in small amounts the hydrochloric acid required for the digestion of food

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Chemistry
Why is water not suitable for putting out a petrol fire ?

The heat required for combustion of petrol is very low
Water, being heavy, slips below petrol which thus remains in contact with air and burns
The oxygen content of water is isolated by petrol and thus it helps in burning
Petrol is too inflammable to be extinguished by water

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