As salespeople, we should avoid asking intrusive questions involving their personal lives (unless we have a close relationship with the client). We also must try and avoid closed-ended questions that can be answered with a simple yes or no. These questions do not give us much information and can stop a sales meeting in its tracks.
In sales, certain questions can potentially make customers uncomfortable or negatively impact the relationship. For example, aggressive or confrontational questions that put the customer on the spot can make them defensive and less willing to engage in the conversation. Another thing to stray away from is negative or critical questions. Avoid questions that might offend or criticize the customer and instead, focus on highlighting the benefits and solutions.
You need to earn the right to ask tough questions. In any conversation, you wouldn't ask something that wasn't within the realm of the conversation. Same thing in sales. Here's an Explore piece on this topic!