Chemistry
Suspension particles have the size between

10–5 – 10–7cm
10–1 – 10–2 cm
10–8 – 10–10cm
10–2 – 10–4 cm

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Chemistry
Peptization is a process of

Protection of colloidal solution
Precipitation of colloidal particles
Purification of colloids
Dispersing precipitates into colloidal solution

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

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