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matching......

Fri, 19 Mar 2010 21:28:04 +0530

1)SO2Cl2 Paramagnetic
2)K2HgI4+NaOH Refrigeration
3)Flourocarbons Testing NH3
4)NO H-bondidng

JEE 2010 admit card

Fri, 19 Mar 2010 21:02:02 +0530

anyone received it ?????????????????

IIT 1997

Fri, 19 Mar 2010 19:54:13 +0530

The critical temperature of water is higher than that of O₂ because the H₂O molecule has :
A. fewer electron than O₂
B. two covalent bonds
C. V-shape
D. dipole moment

Fiitjee has given two answers to this q so im not sure of the ans.

Hats Off - Deadman...

Fri, 19 Mar 2010 19:00:07 +0530

1) Which of the following will dissolve in a mixture of NaOH And H₂O₂ ?

a) Ferric Hydroxide b) Chromic Hydroxide c) Aluminium Hydroxide d) Zinc Hydroxide

2) Select the wrong statements -

a) Boron atom in the icosahedron has 5 other B atoms bonded to it, while C in diamond has only 4 nearest neighbours.
b) Thalium Tri-iodide is isomorphous with Thallium Tri-iodide.
c) In nitration mixture, Nitric Acid behaves as a base, and Vant-Hoff factor for nitration mixture is 4.
d) Dipole moment of CH₃F>CH₃Cl.

Both are multi-correct type.

a-f

Fri, 19 Mar 2010 18:47:01 +0530

**edit**
in first step only 1 eq grignard is used
****

More coffee or more milk?

Fri, 19 Mar 2010 18:17:55 +0530

I found this one really interesting, try it out:

* Start with a full cup of black coffee (no milk) and drink
one-third of it.
* Now pour into the cup an amount of milk equal to the coffee
you have just drunk, and stir well.
* Now drink a further half of the resultant mixture.
* Now pour into the cup a further amount of milk equal to the
mixture you have just drunk and stir well again.
* Now drink one-sixth of the resultant mixture.
* Now pour into the cup a further amount of milk equal to the
mixture you have just drunk, stir well, and finally, drink the
whole cup of liquid.
Have you drunk more milk or more coffee in total?

P.S. : Pls give a justification for your answer or tell if you're guessing!

again contradictory answers

Fri, 19 Mar 2010 16:38:54 +0530

AC-adiabatic

An easy logical question!

Fri, 19 Mar 2010 16:36:11 +0530

Today Amy celebrates her birthday. Two days later her twin brother Matthew celebrates his birthday. How can this be so?

Hint: Today doesn't specifically mean the current day!

assereason

Fri, 19 Mar 2010 16:19:31 +0530

1)A:o-chlorotoulene on treatment with NaNH2/NHH3 gives o and m toulidene
R: this reaction is nucleophlic aromatic substitution

2)A:Alkeenes are more reactive than alkynes in electrophilic addition reactions
R:Alkyl carbocation is less stable than vinyl carbocation

*****only ans plzzzzz

doubt in optics

Fri, 19 Mar 2010 16:14:42 +0530

A diverging lens is placed at origin of coordinate sysytem.eqn of incident ray is y=-x/2+3. The focal length of lens is 4 cm. find eqn of divergent ray...
please help....anyone..

probability

Fri, 19 Mar 2010 15:38:38 +0530

two numbers a and b are chosen from the set {1,2.......25}. the probability that a⁴-b⁴ is divisible by 5 is?

ans:2/3

ISAT/AIEEE cards

Fri, 19 Mar 2010 13:57:31 +0530

anyone recieved ISAT2010 and AIEEE2010 admit cards ??????

Alternative proof of Fermat's last theorem...

Fri, 19 Mar 2010 13:38:00 +0530

This is a brilliant brilliant proof i read today...

This is from a book called problem solving strategies... (it is a brilliant read!)

organic.. SM

Fri, 19 Mar 2010 13:24:03 +0530

Q1. The weakest base among the following is:
(a) amines (b) Amides (c) Ketones (d) Nitriles

more will be added after this question gets answerd

fjee doubts (maths miscellaneous)

Fri, 19 Mar 2010 11:18:51 +0530

Q1. Let .
If then greatest area bounded by xφ(x) and coordinate x=0 and x=5 is

(a) 16 (b) 25 (c) 8 (d) 35/2

Q2. Let a is a complex number, satisfying
then maximum value of |a-3-4i| is

(a) 2 (b) 4 (c) 5 (d) 6

Q3. A/R
Stmnt 1: The area of the triangle on the argand plane formed by the complex nos. z,iz and z+iz is 1

2|z|²

Stmnt 2: Multiplying any complex number by i rotates it by π/2 wrt itself in anticlockwise direction

(A or B???)

Q4. Let ,
then

(a) 0(b) 0 < I2 < I1 < 1

Q5. Normal of parabola y²=4x at P and Q meets at R(x₂,0) and tangents at P and Q meets at T(x₁,0), If x₂=3, then the length of latus rectum plus tangent PT will be
(a) 3 (b) 6 (c) 1 (d) 8

minimize

Fri, 19 Mar 2010 11:01:38 +0530

Find the value of a for which is minimized. (easy one) for prac.

Let f(x) be a continuous function satisfying

Find the value of k for which is maximized.

Easy one

Fri, 19 Mar 2010 10:11:10 +0530

How many litres of SO2 has to be passed through HClO3 to reduce 16.9 g of it to HCl..

Ans 13.44

point out mistake...

Fri, 19 Mar 2010 09:52:04 +0530

in an insulated vessel,0.05kg steam at 373K and 0.45kg of ice at 253K are mixed .Find final temp of the given mixture.
L(fusion)=336J/g
L(vap)=2268J/g
S(ice)=2100J/kg
S(Water)=4200/kg

ans given is 273..i am getting 262K

my soln is ::
0.05(2.268)+0.05(4200)(T-273)=0.45(2100)(20)+0.45(0.336)+0.45(4200)(T-273)

point out mistake

what ans are u getting ?

Fri, 19 Mar 2010 00:58:18 +0530

if tan(πcosθ)=cot(πsinθ)
then form eqn whose roots are cosθ and sinθ

aciidic h ??

Fri, 19 Mar 2010 00:44:42 +0530

which is most acidic H ??