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Sentence Correction: Preposition and Idiom Questions - Overview

Most consumers are uncertain as to whether the deodorizing products they use are safe for application for the skin.

This answer choice is grammatically incorrect. The correct idiom is to apply something to something, or in this case, application to the skin.

Although this answer choice corrects the original Preposition mistake by replacing for with to, it is stylistically flawed. The wordy phrase the application of such products creates redundancy.

Although this answer choice corrects the original Preposition mistake by replacing for with to, in the GMAT, the addition of the phrase or not at any point after the word whether is considered redundant.

Although this answer choice corrects the original Preposition mistake by replacing for with to, in the GMAT, the word if should be used in Conditionals only. Since in this question there is no condition, if should be replaced by whether.

Think of whether as a choice between two possibilities dealing with the same subject or as a yes/no question.

Example: I do not know whether this will work. (yes or no)

He was not sure whether he wanted banana or chocolate cake. (a choice between 2 possibilities)

Nice!

The correct idiom is to apply something to something, or in this case, application to the skin.

as to whether the deodorizing products they use are safe for application for
as to whether or not the deodorizing products they use are safe for application to
if the deodorizing products that they use are safe for application to
as to whether the deodorizing products they use are safe for the application of such products to
whether the deodorizing products they use are safe for application to