How do I differentiate radio buttons?

If I have multiple questions on form using radio buttons, how do differentiate the set of choices for EACH question?

Not sure I follow the question. Radio buttons permit only one choice from the group. They should all have the same name attribute value.

    <fieldset>
      <legend>Choose a color</legend>
      <label><input type="radio" name="color" value="red"> Red</label>
      <label><input type="radio" name="color" value="green"> Green</label>
      <label><input type="radio" name="color" value="blue"> Blue</label>
    </fieldset>
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