Chemistry Adda

Class 10th
Metals and Non-metals
Quick revision

Wa­ter turns sol­id at 20 de­grees, if it con­tains meth­ane. They must be mixed to­geth­er at high pres­sure. Then wa­ter and meth­ane some­times form gaseous hy­drate, which at a tem­per­a­ture of up to 20 de­grees re­sem­bles packed snow.
मेथेन होने पर पानी 20 डिग्री पर ठोस हो जाता है। उन्हें उच्च दबाव पर एक साथ मिलाया जाना चाहिए। फिर पानी और मीथेन कभी-कभी गैसीय हाइड्रेट बनाते हैं, जो 20 डिग्री तक के तापमान पर पैक्ड बर्फ जैसा दिखता है।

Q:-Can you freeze air ?
Ans:-Yes, you can. Air is mainly a mixture of nitrogen gas (N2) and oxygen gas (O2). Their freezing points are -210 °C and
-219 °C respectively, so below -220 °C, air would freeze. This has been achieved by using liquid helium. Helium, however, is the only known gas that does not freeze. Helium liquefies at -270 °C.