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I have read somewhere.. the maximum covalecy that an atom can show is the total no. of orbitals it has. Weather filled or unfilled... And so in case of Boron its 1 + 3 = 4 how can we find the max. covalency of an element like ...
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More is the hydration enthalpy of an ion, more vigorously will it dissolve in water. Why is it so? ...
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A line is drawn through a fixed point P (m,n) to the circle x2 + y2 = r2 at A and B. Find PA x PB. ...
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find the eqn. of those tangents to the circle x2 + y2 - 2x - 4y - 4 = 0 which are parallel to the line 3x - 4y - 1 = 0 ...
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Arrange the following in increasing order of dehydration *Image* ...
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if D = diag(a1 , a2 , a3 , ...... an), where ai ≠0 for all i = 1,2....,n, then show that D-1 = diag(a1-1 , a2-1 , a3-1 , .......... an-1). ...
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Two rods of different materials with coefficients of linear expansion α1 and α2 respectively; Young's moduli Y1 & Y2 respectively; of initial lengths l1 and l2 respectively are joined at one end. the free ends are fixed to ...
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Can someone tell me, how is the equation of a plane passing through the line of intersection of two planes u = 0 and v = 0 given by, u + ∂v = 0 where, '∂' is a scalar quantity?? ...
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please remove this new look.... i think this has resulted in loss of users from targetIIT.... some demerits i feel are... 1. we can't see recent posts... 2. neither an option for latex 3. looks so bad.. 4. a bit complex to us ...
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using the method of integration for bodies having continuous distribution of mass.... we use... Xcm = 1/M ∫x.dm we all know this (not sure)... but here's what is annoying me... on finding the COM of a ring... we set y = r s ...
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can i join only chemistry from edudigm? ...
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cosider these two reactions, *Image* My question is why in the case of chlorination the major product formed is different than the one formed in the bromination..? ...
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Prove that f(x) = [x2] - [x]2 is discontinuous for all integral values of x except only at x = 1. ...
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suppose f:R->R is a differentiable function and f(1) = 4, then find the value of lim ∫(frm 0 to 4){ 2t/x-1 dt}. x->1 ...
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find domain of sin-1 { x2 + 1/2x } m not able to find it... please help me...!! ...
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let, f( x+y/2 ) = f(x)+f(y)/2 for all real x and y and f'(0) exists and equals -1 and f(0) = 1, find f(2) ...
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while solving a question i got stuck here..!! (a0xn + a1x(n-1) + a2x(n-2) + ............... + an)(a0/xn + a1/x(n-1) + a2/x(n-2) + ............... + an) = (a0xn + a1x(n-1) + a2x(n-2) + ............... + an) + (a0/xn + a1/x(n-1 ...
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if f(x - 1) + f(x + 1) = √3 f(x) then prove that f(x) is periodic with period 12` ...
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The value of lim (n -> ∞) [sum (r varies 1 to n) {1/2r}], where [.] -> G.I.F is ................ ...
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2. Triangle ABC is divided into four parts by straight lines from two of its vertices. Area of three triangular parts are 8 , 5 and 10. what is the area of remaining part? *Image* . ...
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greater is the s-character .................... is the bond energy... (A) Greater (B) lower (C) both (D) none of these ...
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i m too weak at Chemistry... actually something because of which i won't be selected in JEE is just this chemistry... especially the organic part... our chem. teacher was going good with chem but got transferred from our FIIT ...
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if the range of tan-1 (3x2 + bx + c) is [0,pi/2) then relate b and c. ...
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1) Let f : R -> (0,pi/2] then find the set of val. of a for which f(x) = cot-1 (x2 - 2ax + a + 1) is surjective ..... !! sorry for the irrelevant title....!! ...
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prove that locus of moving points such that the sum of squares of distances of any point from two fixed points is always a constant is a circle. can someone prove it without using co-ordinate geometry... i mean using plane ge ...
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Let AN be any line drawn through A in a Triangle ABC. Let BM, CN perpendiculars are drawn from B and C to AN and let D be the mid-point of BC, prove that MD = ND. ...
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sum till infinite terms of the series cot-1 3 + cot-1 7 + cot-113 + ....... is (A) pi/2 (B) cot-1 1 (C) tan-1 2 (D) none of these my approach this is something we have to find *Image* now how to approach (2) sin-1 sin 12 + co ...
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Let f(x) be a function such that on putting any value of x we get the equation of a hyperbola which is conjugate of the hyperbola having x as eccentricity. then find, f(f(f(f(x))) ...
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log |x| |x - 1| > 0 , x E R ...
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|x|2 - |x| - 2/2|x| - |x|2 - 2 > 2 holds if and only if (A) - 1 < x < -2/3 or 2/3 < x < 1 (B) -1 < x < 1 (C) 2/3 < x < 1 (D) x > 1 or x < -1 or -2/3 < x < 2/3 ...
