The Negative Charges Associated with Smectite Clay Crystals Are Due

question 38

Multiple Choice

The negative charges associated with smectite clay crystals are due mostly to _____.

• A)isomorphous substitution of Mg for Al in the octahedral sheet
• B)substitution of Al for Mg in the tetrahedral sheet
• C)high pH associated with the formation of the mineral
• D)substitution of Si for Al in the tetrahedral sheet
• E)OH groups on the external surface of the crystal

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