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![[Post New]](/templates/default/images/icon_minipost_new.gif) 3 Feb 2008 22:28:47 IST
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plz explain ur answers....
1.To prevent magnesium from oxidation in electrolytic extraction process....
(a)some calcium flouride is added
(b)some chlorides are added
(c)metal is taken out by spoons
(d)the whole process is done in an atmosphere of coal gas
2.Mark the incorrct statement..(plz mention what is lithopone)
(a)lithopone is cheap and possess good covering power
(b)lithopone is yellow pigment
(c)lithopone is prepared by mixing barium sulphide and zinc sulphate
(d)lithopone is a mixture of barium sulphate and zinc sulphide
3.which of the alkaline earth metal is the strongest reducing agent
(a)Ca (b)Sr (c)Ba (d)Mg
4.Mgcl2.6H2O when heated gives
(a)magnesium oxychloride
(b)magnesium dichloride
(c)magnesium oxide
(d)magnesium chloride
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3 Feb 2008 22:35:42 IST
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c bro, i only know d ansrs of 3. and 4.
d ansr 4 d 3rd one is (c) Ba
cz it can easily give itz electrons in comparison 2 all d odr elements.... given in the options....
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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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3 Feb 2008 22:41:27 IST
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c dude.... d ansr is magnesium hydroxychloride... if only heated...
d compound is formed due to high hydration energy of Mg....
but when magnesium hydroxychloride is heated dn MgO and HCl are formed.... so (c) can be d ansr....
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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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4 Feb 2008 19:01:15 IST
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the answer to first ques is d
whenever Mg is oxidised carbon from coal reduces it to metal and gets oxidised to CO2
3rd ques
ans is as given by svj29 and the xplanation is quite right
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