Question

an student took hcl in conoial flask & was plased on a white title​

Answer 1

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• A student took HCl in a conical flask and was placed on a white tile with cross mark. When seen through the flask the mark was visible. On adding some sodium thiosulphate in the flask the cross marked disappeared when seen through the flask.

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hope it's helpful for you¯\_(ツ)_/¯

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@ magicalworld75 ❤️

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