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a
Glass & Cement --- Man made silicate
b
Silicagel --- drying agent
c
Carbon monoxide --- strong oxidising agent
d
To control the odour in air conditioning system --- Activated charcoal
answer is C.
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Detailed Solution
Glass & Cement are - manmade silicatesSilicagel is used as drying agent [used for removal of moisture]Carbon monoxide is acting as strong reducing aqentEg : 3CO+Fe2O3→10000C3CO2+2Fe ZnO+CO→Zn+CO2Activated charcoal is used to control the odour in air conditioning system. [Activated charcoal is acting as adsorbent]