E-StoreHome » Ask & Discuss » Institutes & Courses » About IITs and JEE « Back to Discussion
About IITs and JEE
please post here all the mistakes u can find in various jee keys. let me start off
the question to find the no of unpaired electrons in the brown ring complex(assertion reason)
i feel that the reason is wrong. no key mentions this. but the NO group is chargeless and Fe is in +2 oxidation state rather thn in +1 state, dont u agree?
Comments (24)
a lot of the soln.s of the narayana tutorials are pretty much questionable......one such debatable Q is tht of the potential of the earth......i feel tht the reason is right and it explains the assertion....pot. at surface of the earth= KQ/R.....the first thng tht comes to ur mind speaking of earth as a spear is its huge radius and thus the pot. at the surface of the earth is practically =0 nd thts why i feel the answer shud hav been A) instead of B)........
i hav not understood the soln. to the coordination compound assertion reasoning.....(the optical isomerism walla)......wud be great if some one comes ahead and explains the soln....
even i feel that the answer shud be A......nd even the chem. teacher of my insti. said it shud be A).....but BT has a different view pt....he says tht there cud be optical activity evn if there is an axis of symetry......
yaar lets hav some views on the potential of the earth wala Q......wat do u guys feel abt it........
in match matrix in phy,
the graph of displacement vs. time for 2d motion can hav an y intercept, while in some solution the answer is the one with y intercept as zero.
in the question it is not mentioned that the displacement is measure from the inertial position of the body
if u remember when u solve a question of this type-
a body starts from origin goes north-west by 10m and then 5 m towarsds west.. find the displacement of the body FROM THE ORIGIN?
it is always mentioned from where u hav to clac the displacement (like here it is mentioned from the origin). which means that displacement will change when measure from diffrent point. (hope u get my point)
hence the graph can also have some intercept
in chem the CMC question in , which makes more lather..............
in my opinion the ans should be B which has R-SO3H attached to it (it is a cationic detergent) while the option A is R'-NR2 (which is anionic).
in ncert it is written that anionic detergent r used for medical purpose while cationic detetgent r used in toothpaste. henc from practical knowledge v can conclude that tooth paste form lather easily than those used in medical purpose.
the answer to the brown ring ques in A/R section, question on the OS of Fe
NO indeed replaces a water ligand, but by doing so, it is oxidized to a nitrosyl ligand, NO+. So, you get the compound [Fe(H2O)5NO]2+, but in this compound there is no NO ligand, but a NO+ ligand. The iron has oxidation state +1 in this complex, which is quite remarkable! Normally, iron has oxidation state +2 or +3.
On dilution, the nitrosyl complex is destroyed. It hydrolyses. The NO+ entity is not stable in water and is quickly converted to NO2- and/or HNO2. Iron in oxidation state +1 is not stable in water and so, the nitrite is reduced to gaseous NO.
Preparing for IIT-JEE ?
Arihant Revision Package for IIT JEE - Books, Practice Tests + Rank Predictor
@ INR 1,995/-
For Quick Info
Find Posts by Topics
Physics.
TopicsMathematics.
Chemistry.
Biology
Institutes
Parents
Board
Fun Zone
|
|
|
|
|
| 35,229,755 Engineering Questions Attempted |
6,69,530 Visitors Monthly |
79 Engg. Exam Covered |
826 Students Currently Online |
Connect with Us  |
 |
i am also having a doubt in the same question ...