Which of the following is not a method of preparing oxygen?

1.	Which of the following is not a method of preparing oxygen?
Answer» <html><body><p> Decomposition of manganese dioxide</p><br/><br/><p>One of the two <a href="https://interviewquestions.tuteehub.com/tag/chemical-914796" style="font-weight:bold;" target="_blank" title="Click to know more about CHEMICAL">CHEMICAL</a> methods starts from <a href="https://interviewquestions.tuteehub.com/tag/natural-575613" style="font-weight:bold;" target="_blank" title="Click to know more about NATURAL">NATURAL</a> manganese dioxide and converts it <a href="https://interviewquestions.tuteehub.com/tag/using-7379753" style="font-weight:bold;" target="_blank" title="Click to know more about USING">USING</a> dinitrogen tetroxide and water to manganese nitrate solution. Evaporation of the water <a href="https://interviewquestions.tuteehub.com/tag/leaves-1070823" style="font-weight:bold;" target="_blank" title="Click to know more about LEAVES">LEAVES</a> the crystalline nitrate <a href="https://interviewquestions.tuteehub.com/tag/salt-1193804" style="font-weight:bold;" target="_blank" title="Click to know more about SALT">SALT</a>. At temperatures of 400°C, the salt decomposes, releasing N2O4 and leaving a residue of purified manganese dioxide.</p></body></html>

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