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![[Post New]](/templates/default/images/icon_minipost_new.gif) 23 Jan 2008 02:20:20 IST
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which fumes in air? a. BeCl2 b.MgCl2 c.CaCl2 d.BaCl2 when Na is heated in moist air, the product obtained is: 1. Na2O 2. NaOH 3. Na2CO3 4. NaO... plz ansr wid soln rates assured.....
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ans of 2nd one will be 2
Na + H2O > NaOH + H2
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23 Jan 2008 02:52:29 IST
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Ans of 1 st will be MgCl2 as Mgcl2 has weak covalent character it decomposes in moist air to form HCl which gives fume
Please do rate if i m correct or else tell me
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23 Jan 2008 02:57:56 IST
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well sry d ansr 4 d 1st one is given as BeCl2 n 4 d 2nd one is given as Na2O...i 2 thought the same bt d ansrs given r different...
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23 Jan 2008 03:04:48 IST
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The second answer is quite obvious and logical.
See the reduction potential of Na is much much less than that of H, hence it cant oxidise H as so the answer given by Rakesh is wrong.
Probability of formation of Na2CO3 is very less as when the ques is saying moist air, it demands some reac between Na,H2O,O not CO2
And formation of a simple oxide is much more favourable than that of a peroxide(NaO).
Hence the answer is Na2O.
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23 Jan 2008 03:10:03 IST
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u cn't count out NaOH like dat only...u knw when Na is exposed to air dn 1st it forms Na2O and then when it reacts with H2O it forms NaOH and when it comes in cntct with CO2 dn it forms Na2CO3...
i'm sure about d above data...but its for air.......
NOT 4 moist one...and if the air is moist dat is dere is more cntent of H20 so NaOH cn't be neglected dere shud be sum rsn....
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PROGRESS ISN'T MADE BY EARLY RISERS OR HARD WORKERS, BUT BY LAZY PEOPLE TRYING TO FIND EASIER WAY TO DO THE SAME.....SO BE LAZZZZYY!!!! |
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23 Jan 2008 03:13:11 IST
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I counted out NaOH becoz in the reaction it was forming H2, means it was oxidising H which is not possible.
I didnot do that without reason. I applied redox and electrochem there.
Reactivity series-
Li
Khud dekh lo Na kitna peechhe hai H ke. It cant oxidise H.
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The quality of a person's life is in direct proportion to their commitment to excellence, regardless of their chosen field of endeavor.
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23 Jan 2008 03:20:15 IST
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sorry in 1st one my reason is correct but i made a mistake as per fajan rule Be cl is more covalent as size of Be less than mg
Sorry
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23 Jan 2008 03:20:43 IST
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arre yeh series likhi kyon nahi aayi?
Li
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The quality of a person's life is in direct proportion to their commitment to excellence, regardless of their chosen field of endeavor.
It is during our darkest moments that we must focus to see the light.
Check out my blog at:
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23 Jan 2008 03:22:23 IST
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Hadd hai yaar. Do baar likhi, ek bhi baar poori nahi aayi. Kaisa bekar system hai goiit ka. Li < K < Ba < Ca < Na < Mg < Al < Zn < Fe < Ni < Sn < Pb < H
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Check out my blog at:
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