3. Can we insert excel charts or tables into PPT slide at desired slide?
You can convert an Excel chart to image using Aspose.Cells API, and then insert this image in the presentation file using Aspose.Slides API. Please refer to these help topics: Convert an Excel Chart to Image, Add an Image in the Table Cell and Creating a Table on PowerPoint Slide
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4. Arabic texts supported?
Aspose APIs can manipulate multilingual documents. The Arabic language is also supported.
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5. Themes supported for slides similar to MS PPT?
Aspose.Slides API has support of MS PPT themes. You can also load and manipulate PPT presentations. Please check this help topic to open a PPT using Aspose.Slides for Java API: Opening a Presentation