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Cr3+ form four complexes with four different ligands which are [Cr(Cl)6]3–, [Cr(H2O)6]3+, [Cr(NH3)6]3+ and [Cr(CN)6]3–. The order of CFSE (0) in these complexes is in the order :
The geometry of Ni(CO)4 and Ni(PPh3)2Cl2 are [Manipal 2006]
[Cr(H2O)6]Cl3 (at. no. of Cr = 24) has a magnetic moment of 3.83 BM, the correct distribution of 3d- electrons in the chromium of the complex is [CBSE AIPMT 2006] (a) xz x -y , x 3d 3d ,3d (b) xy x -y , 3d ,3d 3d , yz…
The pair in which both species have same magnetic moment (spin only value) is [AIIMS 2006]
The number of possible isomers of an octahedral complex [Co(C2O4)2 (NH3)2]– is [AIIMS2006]
Among the following, the species having square planar geometry for central atom are [AIIMS2006] (i) XeF4 (ii) SF4 (iii) [NiCl4] 2– (iv) [PtCl4] 2–
In which of the following coordination entities the magnitude of o (CFSE in octahedral field) will be maximum? (At. no. Co = 27) [CBSE AIPMT2007]
Which of the following will give a pair of enantiomorphs? (en = NH2CH2CH2NH2) [CBSE AIPMT 2007]
The d-electron configuration of Cr 2+, Mn 2+, Fe 2+ and Co 2+ are d 4, d 5, d 6 and d 7 respectively. Which one of the following will exhibit minimum paramagnetic behaviour? [CBSE AIPMT 2007]
Which of the following complex ions, which is diamagnetic in nature? [CBSE AIPMT 2008]
Which of the following complexes exhibit the highest paramagnetic behaviour? (where, gly = glycine, en = ethylenediammine and bpy = bipyridyl moities) (At. no : Ti = 22, V = 23, Fe = 26, Co = 27) [CBSE AIPMT 2008]
How many electrons are present in 3d orbital of tetrahedral K2[NiCl4] complex? [Guj. CET 2008]
Which of the following complex ion is expected to absorb visible light? [CBSE AIPMT 2009]
Pseudo order reaction A B C (a) (b) (c) (d)
The rate constant ‘k for pseudo first order reaction is (a) 2.303log C C t (b) 2.303 C log t C (c) 2.303log C C t (d) C 2.303log t C Ans. (d) Sol. The rate constant ‘k’ for pseudo first order reaction is C 2.303log …
First order reaction C. Thermal decomposition of HI on gold surface
Match the terms of Column I with Column II and choose the correct option from the codes given below. Column I Column II A. Inversion of cane sugar 1. Zero order reaction B. Decomposition of N2O5
Assertion (A) The reaction mentioned in Above ques. behaves as pseudo first order reaction. Reason (R) Change in the concentration of H2O is negligible.
Consider the following equation, H CH COOC H H O CH COOH C H OH -> t = 0 0.01 mol 10 mol 0 mol 0 mol t 0 mol 9.9 mol 0.01 mol 0.01 mol I.The concentration of water does not get altered much during the course of the…
What is true about pseudo first order reaction?
The value of rate constant of a pseudo first order reaction does not
Inversion of cane sugar in dilute acid is an example of
When one reactant is present in large excess in a chemical reaction between two substances, then the reaction is known as
10g of a radioactive isotope is reduced to 1.25 g in 12 yr. Calculate the half-life period of the isotope.
Half-life period of a first order reaction is 10 min. What percentage of the reaction will be completed in 100 min?