|
Author
|
Message
|
![[Post New]](/templates/default/images/icon_minipost_new.gif)
29 Dec 2007 15:59:54 IST
|
|
|
Ok from inorganic
Element A burns in nitrogen to give an ionic compound B.
Compound B reacts with water to give C and D.
A solution of C becomes milky on bubbling CO2. Identify A, B , C and D
JEE 1997
answer to this qs....
see A jo hai...its burns in nitrogen and it gives B...and its also given ki B is an Ionic compound..
so B must be a metal nitride...
and also its given that B reacts with water to give 2 products i.e C and D
so 1 of these must be ammonia and 1 mst be a metal hydroxide
as C becomes milky
so we all know its Calcium hydroxide
so we can find A is Ca and B is Ca3N2
|
I always like to walk in rain as no one can see me crying there :(
frnds are like diamonds , if u hit them , they don't break but they slip frm ur hands
-----It is better to be hated for what you are than to be loved for what you are not.----
*****wen love and skill work together--expect a masterpiece*****
|
this reply:
20 points
(with 4
in
4
votes
)
[?]
|
|
You have to be logged on to rate
|
|
|
29 Dec 2007 16:02:03 IST
|
|
|
OOPS FORGOT TO GIVE THE RXNS...
3Ca + N2 ---(on heating)---> Ca3N2 (B)
Ca3N2 + H2O ----> Ca(OH)2 + 2NH3
Ca(OH)2 + CO2 ---->CaCO3 + H2O
(the rxns are nt balanced...u can do it urself)
cheers
|
I always like to walk in rain as no one can see me crying there :(
frnds are like diamonds , if u hit them , they don't break but they slip frm ur hands
-----It is better to be hated for what you are than to be loved for what you are not.----
*****wen love and skill work together--expect a masterpiece*****
|
this reply:
15 points
(with 3
in
3
votes
)
[?]
|
|
You have to be logged on to rate
|
|
|
29 Dec 2007 16:15:51 IST
|
|
|
1 4m me....
calculate the volume of sulphuric acid..(conc = 0.95 and density = 1.85 g/cm3) and calculate the mass of water mst be taken to prepare 100 cm3 of sulphuric acid (conc = 0.15 and density = 1.10 g/cm3)?????
|
I always like to walk in rain as no one can see me crying there :(
frnds are like diamonds , if u hit them , they don't break but they slip frm ur hands
-----It is better to be hated for what you are than to be loved for what you are not.----
*****wen love and skill work together--expect a masterpiece*****
|
this reply:
15 points
(with 3
in
3
votes
)
[?]
|
|
You have to be logged on to rate
|
|
|
29 Dec 2007 16:18:43 IST
|
|
|
thnx for the answers but plz dont post any answers right now from now on
plz post them later
|
this reply:
0 points
(with 0
in
0
votes
)
[?]
|
|
You have to be logged on to rate
|
|
|
29 Dec 2007 16:24:09 IST
|
|
|
7 Bromo -1,3 ,4-cycloheptatriene exists as ionic species in aqueous soln while 5 bromo-1,3 cyclopentadiene doesnt ionise in presence of Ag+(aq)
Explain
JEE 2004
|
this reply:
5 points
(with 1
in
1
votes
)
[?]
|
|
You have to be logged on to rate
|
|
|
29 Dec 2007 16:26:02 IST
|
|
|
T/F
easy one...
In an Electric feild , beta particles are more deflected than alpha particles inspite of alpha particles having greater charge..?
|
I always like to walk in rain as no one can see me crying there :(
frnds are like diamonds , if u hit them , they don't break but they slip frm ur hands
-----It is better to be hated for what you are than to be loved for what you are not.----
*****wen love and skill work together--expect a masterpiece*****
|
this reply:
10 points
(with 2
in
2
votes
)
[?]
|
|
You have to be logged on to rate
|
|
|
29 Dec 2007 16:40:41 IST
|
|
|
A ketone A , which undergoes haloform reactionm gives compound B on reduction. B on heating with sulphuric acid gives compound c , ehich forms mono ozonide D. D on hydrolysis in presence of Zn dust gives only acetaldehyde, Identify A B and C
write down the reactions involved
JEE 1989
|
this reply:
10 points
(with 2
in
2
votes
)
[?]
|
|
You have to be logged on to rate
|
|
|
29 Dec 2007 16:45:36 IST
|
|
|
CMMON Guys post more
|
this reply:
0 points
(with 0
in
0
votes
)
[?]
|
|
You have to be logged on to rate
|
|
|
29 Dec 2007 16:57:42 IST
|
|
|
if the radiator of an automobile contains 12L of water how much wld the freezing point be lowered by addition of 5 kg of prestone(glycol) ? how many zerone(methyl alcohol)
wld be required to produce the same result ? Assume 100% purity.
|
"your future depends on what u do in present"
|
this reply:
12 points
(with 2
in
3
votes
)
[?]
|
|
You have to be logged on to rate
|
|
|
29 Dec 2007 17:10:39 IST
|
|
|
Compound X(formula C5H8O) does not react appreciably with Lucas Reagent at room temperature but gives a precipitate with ammonical silver nitrate with excess of Me Mg Br, 0.42 g of X gives 224 ml of CH4 at STP. Treatment of X with H2
in presence of Pt catalyst followed by boiling with excess HI, gives n pentane. Suggest structure for X and write the eqn involved
|
this reply:
15 points
(with 3
in
3
votes
)
[?]
|
|
You have to be logged on to rate
|
|
|
29 Dec 2007 17:33:21 IST
|
|
|
calculate the % error in the hydronium ion concentration made by neglectin the ionixation of water in a 1.0 x 106-6 M NaOH solution
|
"your future depends on what u do in present"
|
this reply:
5 points
(with 1
in
1
votes
)
[?]
|
|
You have to be logged on to rate
|
|
|
29 Dec 2007 18:18:49 IST
|
|
|
You are given marbles of diameter 10mm. They are to be placed such that their centres are lying in a square bond by four lines each of length 40mm.
What will be the arrangement of marbles in a plane so that maximum number of marbles can be placed inside the area.
Sketch the diagram and derive the expression for number of molecules per unit area.
|
"It does not do to dwell on dreams and forget to live, remember that." ~Albus Dumbledore, Sorcerer's Stone.
"It is our choices, Harry, that show what we are, far more than our abilities." ~Albus Dumbledore, Chamber of Secrets.
"Understanding is the first step to acceptance, and only with acceptance can there be recovery." ~Albus Dumbledore, Goblet of Fire.
"Do not pity the dead Harry, pity the living, and above all, those who live without love." ~Albus Dumbledore, Half Blood Prince. |
this reply:
15 points
(with 3
in
3
votes
)
[?]
|
|
You have to be logged on to rate
|
|
|
29 Dec 2007 18:32:33 IST
|
|
|
A current of 15.0 A is applied to plate nickel in NiSO4 bath. Both Ni and H2 are formed at the cathode.
the current efficiency with respect to formation of Ni is 60%.
(a) how many g of Ni is plated on the cathode per hour ? (b) Wht is the thickness of the plating if the cathode consists of a sheet of metal 4 cm square wch is coated on both cases ? the density of Ni is 8.9 g/cm3
(c) wht volume of H2 (STP) is formed per hour ?
|
"your future depends on what u do in present"
|
this reply:
10 points
(with 2
in
2
votes
)
[?]
|
|
You have to be logged on to rate
|
|
|
29 Dec 2007 18:51:18 IST
|
|
|
GUYS KEEP IT UP!!!!!!!!!!!
CMMON MORE..............
|
this reply:
0 points
(with 0
in
0
votes
)
[?]
|
|
You have to be logged on to rate
|
|
|
29 Dec 2007 19:14:44 IST
|
|
|
Apurv has started this forum, I congratulate and thanks him for doing so. I also started a chem QBANK long ago but neither could I post some questions in it nor I got very good response for that. But I am happy that people are responding well to this forum. Well Guys, I wanted to give an advice for this forum as I did in Physics and Maths QBANKs. Please don't post the solutions to the questions here. Post ur question along with the answer but not solution. Everyday many new people join GOIIT, they also have right to do these questions. But when they will find the solution of the question in front of them, they will not solve the question willingly and whole heartedly. I told the same in physics and maths QBANKs. We want these QBANKs to serve as online books of good questions. So please if U think my point is right, then please don't post the solutions here. Those who want the solution can contact the author of that particular question.
|
Tarin Bansal
3rd year undergraduate
B.E. (Hons.) Electronics & Instrumentation
BITS-Pilani Goa Campus
Check out - www.theideacauldron.com |
this reply:
5 points
(with 1
in
1
votes
)
[?]
|
|
You have to be logged on to rate
|
|
|
29 Dec 2007 19:23:37 IST
|
|
|
THANKS TARIN
i came to know that u had started one after i cliked the submit button for my first post
SORRY FOR THAT .......:(
plz u also contribute
and guys Tarin is right
i had already pointed out
plz dont post the soln here a different thread will be taken up for that
|
this reply:
5 points
(with 1
in
1
votes
)
[?]
|
|
You have to be logged on to rate
|
|
|
29 Dec 2007 19:38:57 IST
|
|
|
A mixture of 239Pu and 240Pu has specific activity of 6.0 x 10^9 dis/s.
the half lifes of the isotopes are 2.44 x 10^4 and 6.58 x 10^3 y , Calculate the isotopic composition of this sample.
|
"your future depends on what u do in present"
|
this reply:
15 points
(with 3
in
3
votes
)
[?]
|
|
You have to be logged on to rate
|
|
|
29 Dec 2007 19:48:42 IST
|
|
|
PLEASE POST THE ANSWERS ALONG WITH THE QUESTION so that people can check their answers after solving the question.
|
Tarin Bansal
3rd year undergraduate
B.E. (Hons.) Electronics & Instrumentation
BITS-Pilani Goa Campus
Check out - www.theideacauldron.com |
this reply:
0 points
(with 0
in
0
votes
)
[?]
|
|
You have to be logged on to rate
|
|
|
29 Dec 2007 19:53:54 IST
|
|
|
oops srry..
heres the ans fr abv ques...
% of (239)Pu = 39
% of (240)Pu = 61
|
"your future depends on what u do in present"
|
this reply:
5 points
(with 1
in
1
votes
)
[?]
|
|
You have to be logged on to rate
|
|
|
29 Dec 2007 21:17:07 IST
|
|
|
i think others shud try n post the answers...
give a period of 2 days.......if no solution is posted n 2 days by any one
then the author can post the solution......
but no rates shud be given for the person who post a solution of his own qs....
|
<div style="font-family:arial,sans-serif;font-size:11px;">
|
this reply:
5 points
(with 1
in
1
votes
)
[?]
|
|
You have to be logged on to rate
|
|
|
|
|
Moderation Team
Community Discussion Question:
![[Up]](/templates/default/images/icon_up.gif "[Up]"){kind=icon}
