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Can anyone pls. tell me whether the values of constants and mass
numbers will be provided or not in WBJEE?

It is Lithium since it has the highest value of hydration energy which in turn is a measure of it's ability to undergo dissociation when placed in water.

I still can't get it ! Pls. solve it for me. I know I am troubling you but pls. do it for your brother!

A certain oscillation results from the addition of coherent oscillations of the same direction y=a cos [

t + (k-1)

] where k is the number of oscillations[k=1,2,3,....,N] and

is the phase difference between kth and (k-1)th oscillations. The amplitude of resultant oscillation will be
a) (a sin (N/2))/(sin (

/2))
b) a sin (

/2)
c) a sin (n

/2)
d) none

Pls. show the steps

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Sorry, you are right!

KMnO4+KI+H20------>KOH+Mn02+KI

Thus the oxidation number of Mn changes from +7 to +4.Won't the answer be 3 ?

How many electrons are formed in oxidation of KMnO4 in basic medium?
a)1
b)2
c)5
d)3

Please do care to show the steps!

Pls. send it to me at agnit_thebest@yahoo.com

Let k=1(degree) then 2sin2k+4sin4k+6sin6k+...........+180sin180k is equal to:-
a) 90 cos k
b) 90 tan 89k
c) 90 tan k
d) 90cot 89 k

Please explain the steps and hurry!!!

Arihant,O.P Aggarwal and J.D Lee!

This is so because the electronegativity comes into play in inductive effect. There is negative inductive effect due to chlorine being highly electronegative but we should also consider resonance effect in which chlorine donates electrons. When the 2 effects clash it is the resonance effect which will predominate.

Both have the hybridisation sp3.

Yes I think the correct answer is H-C-C-H
II II
O O

Very helpful, wonderful and and gives hope to all!!!

I think its 1/2.