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Soil Mechanics and Foundation Engineering

Q1:

Pick up the correct statement from the following:

A A soil having pH value more than 7 is an acidic soil

B A soil having pH value less than 7 is an acidic soil

C A soil having pH value more than 7 is an alkaline soil

D A soil containing chemicals for the manufacture of portland cement is preferred.

ANS:B - A soil having pH value less than 7 is an acidic soil

Alkaline soils are characterized by elevated concentrations of exchangeable sodium ion (>15%), free carbonate and bicarbonate, low calcium, high pH value (8.5-10). The pH value from 7.0 to 7.5 is considered neutral. pH value over 7.5 is alkaline.

pH value less than 7.0 is acidic.

Soils with a pH of less than 5.5 are considered strongly acidic.



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