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Which of the following is capable of absorbing excess moisture from the air?

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in Construction & Building Materials by (190k points)
Which of the following is capable of absorbing excess moisture from the air?

(a) Silica gel

(b) Charcoal

(c) Salts of calcium or ammonia

(d) Activated alumina

I got this question in final exam.

This is a very interesting question from Systems and Essentials of Air Conditioning System topic in portion Air Conditioning, Thermal Insulation, Stones & Ferrous Metals of Construction & Building Materials

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Right option is (c) Salts of calcium or ammonia

The explanation is: Absorbents like salts of calcium or ammonia are capable of absorbing excess moisture from the air. However, the adsorbents like silica gel and activated alumina allow moisture to stay only at the surface.

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