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The surface area available for the nth layer is equal to the coverage of ____________

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The surface area available for the nth layer is equal to the coverage of ____________

(a) (n-1)th layer

(b) (n+1)th layer

(c) nth layer

(d) none of the mentioned

The question was asked in an interview for internship.

My doubt stems from B. E. T. Adsorption Isotherm in division Criteria of Purity and Characterisation of Materials of Engineering Chemistry I

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Best answer
The correct option is (a) (n-1)th layer

Best explanation: The surface area available for the nth layer is equal to the coverage of (n-1)th layer. By application of the BET theory, it is possible to determine the inner surface of hardened cement paste.

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