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1) A metallic element crystallises into a lattice containing a sequnece of layers of ABABAB.. Any packing of spheres leaves out voids in the lattice. Percentage of Empty Space (by Volume) is - a)52% b)48% c)50% d)74% Its clea ...
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Could be of some help to all --- A chemical reaction is a process in which one set of chemical substances (reactants) is converted into another (products). It involves making and breaking chemical bonds and the rearrangement ...
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Arrange the following in increasing order of extent of hydrolysis (A) PCl3 > AsCl3 > SbCl3 > BiCl3 (B) PCl3 > AsCl3 > BiCl3 > SbCl3 (C) BiCl3 > SbCl3 > AsCl3 > PCl3 (D )BiCl3 > SbCl3 > AsCl3 â ...
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Cos(α - β)=1 & cos(α + β)= 1/e ; where α,β ε [-π,π] The number of pairs (α,β) which satisfy both the equations is -- (a) 0 (b) 1 (c) 2 (d) 4 ...
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An optically active alcohol (A) [C6H10O] absorbs 2 moles of hydrogen per mole of [A] upon catalytic hydrogenation and gives a product [B].[B] is resistant to oxidation by CrO3 and does not show any optical activity.What is no ...
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Number of S-S bond present in P4S3 is ___. Can we do this if we dont know the structure ? ...
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How are u (IIT JEE 2010 aspirants) planning to spend Saturday,10th April ?? Please tell,,Fiitjee said to do 'Pranayam' and yoga, which i dont know and some say to see movies and all..so not sure..pls reply. ...
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Which species is not coloured ? (a) Ni(DMG)2 (b) [Co(SCN)4]2- (c) [Fe(H2O)5SCN]2+ (d) [Al(OH)4]- ...
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Which Nitrogen oxide does not have a coordinate bond ?? Its NO right ? ...
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Which of the following carbocation can be easily isolated ? (A) (Me)3C+ (B) *Image* + (C) Ph-CH2 + (D) H2C=CH--CH2 ...
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S1 : The reaction of o-bromoanisole gives only meta-aminoanisole on reaction with KNH2 in liquid ammonia. S2 : The above reaction is an example of elimination-addition mechanism. ...
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*Image* 2 moles of the above compound + H+ ---> ...
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S1 : A mixture of primary,secondary and tertiary amines is formed in good yield by heating carbonyl compounds with NH3 and H2 in presence of a catalyst. S2 : The eqb. constant for addition of NH3 to all carbonyl compounds are ...
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*Image* (i) CH2PPh3 (ii) CH2I2/Zn -----> ?? ...
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*Image* The above compound + Q 1. B2D6/CH3COOD Q 2. B2H6/D2SO4/D2O Q 3. B2D6/dil H2SO4 ...
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CH3 O | || CH3--C----C----NH2 + Br2/KOH/Δ -----> ?? | Br IS this the final product -- CH3 | CH3C=NH ...
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1. Which of the following statements is false ? (a) Saline hydrides are stoichiometric compounds. (b) Ionic hydrides are crystalline,non-metallic and non-conducting in solid state. (c) The melts of ionic hydride are non-condu ...
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1. Which of the following statements is not correct ? (a). Pure para hydrogen can be obtained by cooling ordinary hydrogen to about 20 K. (b). The ratio of ortho and para hydrogen at 300 K and above is 3 : 1. (c). The ratio o ...
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*Image* + (i) Hg(OAc)2/HOH/THF ---> ?? (ii) NaBH4/NaOH There will be anti addition of water or syn addition ?? ...
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S1 : For the reaction : O3 \Leftrightarrow O2 + O O + O3 \rightarrow 2O2 (slow) --------- 2O3 \Leftrightarrow 3O2 The molecularity of first step is 1 and that of second step is 2. S2 : O(g) is an intermediate and rate of reac ...
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A hypothetical reaction, 2X + Y2 ------> 2XY X + X \Leftrightarrow X2 (fast) X2 + Y2 \Leftrightarrow 2XY (slow) then the order of the reaction is A. 1 B. 2 C. 3 D. undefined ...
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CH3COCH3 + conc. HCl/Zn-Hg/D2O/Δ → ?? Are these the products --- CH3CH2CH3,CH3-CHD-CH3,CH3CD2CH3, ...
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Grams of potassium dichromate required to oxidize 24.82 g of Fe2+ in FeSO4 to Fe3+,if the reaction is carried out in acidic solution is ___ ...
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In a reaction : A + 2B \Leftrightarrow 2C,2 moles of A,3 moles of B and 2 moles of C are placed in 2 L flask and the eqb concentration of C is 0.5 mole/L.The eqb constant (K) for the reaction is (a). 0.073 (b). 0.147 (c). 0.0 ...
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A catalyst decreases the energy of activation of the reaction : A--->B,ΔH=37.012 Kcal,by 2 %. At 27 C 4 x 10-8% of the product molecules i.e B is able to cross over the potential barrier in absence of catalyst.How many ti ...
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What is the shape of I3- ? What is the geometry of I3- ? When do we write TBP and when linear,i.e in which case we consider l.p's ? ...
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Pick out the orbital(s) with maximum number of nodal planes A. 3dxy B. 4dz2 c. 4dxy D. 2px ...
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≈ Edited ≈ ...
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Among the following,the surfactant that will form micelles in aqueous solution at the lowest molar concentration at ambient conditions is A. CH3(CH2)15N+(CH3)3Br- B. CH3(CH3)11OSO3- Na+ C. CH3(CH2)6COO-Na+ D. CH3(CH2)11N+(CH3 ...
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Lyophilic sols are A. Irreversible sols B. They are prepared from inorganic compound C. Coagulated by adding electrolytes D. Self-stabilizing Should not the ans be C ?? Fiitjee has given A as Ans. ...
