1. What is the colour of the powder collected in a watch glass ? (i) White (ii) Grey (iii) Black (iv) Brown - Sarthaks eConnect | Largest Online Education Community
![Catalysts | Free Full-Text | A Hands-on Guide to the Synthesis of High-Purity and High-Surface-Area Magnesium Oxide Catalysts | Free Full-Text | A Hands-on Guide to the Synthesis of High-Purity and High-Surface-Area Magnesium Oxide](https://pub.mdpi-res.com/catalysts/catalysts-12-01595/article_deploy/html/images/catalysts-12-01595-ag.png?1670489267)
Catalysts | Free Full-Text | A Hands-on Guide to the Synthesis of High-Purity and High-Surface-Area Magnesium Oxide
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Amazon.com: Magnesium Oxide Powder | 400mg | 8 Ounces (227 g) | Vegetarian, Non-GMO, and Gluten Free Supplement | by Horbaach : Health & Household
![a) Dark brown color change Synthesized MgO-NPs from Camellia-sinensis... | Download Scientific Diagram a) Dark brown color change Synthesized MgO-NPs from Camellia-sinensis... | Download Scientific Diagram](https://www.researchgate.net/publication/347399476/figure/fig2/AS:1132436180205570@1647005233049/a-Dark-brown-color-change-Synthesized-MgO-NPs-from-Camellia-sinensis-with-b-MgO-NPs.jpg)