The following conditional tags marked with blue just before and after to show the widget in a specific page in Blogger. For instance, if you want:
Showing the widget in a specific page
<b:if cond='data:blog.url == "URL of the page"'></b:if>
<!-- Here Is Your Content that you want to show on specific page -->
</b:if>
Hiding the widget in Specific Page / Particular Page
<b:if cond='data:blog.url != "URL of the page"'></b:if>
<!-- Here Is Your Content that you want to hide on specific page -->
</b:if>