Granite is almost impervious _____ acid-rain damage.
Tripura Public Service Commission - 2025,
Answer: C
The blank takes to: Granite is almost impervious to acid-rain damage.
Impervious means not allowing something to pass through or not affected by it, and it is always followed by to: impervious to water, impervious to criticism.
Impervious by, with and of are not idiomatic; the adjective is fixed with to, just as its near-synonyms immune to and resistant to are.
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