Be sure to answer all parts Consider the conversion of

Consider the resonance hybrid of the formate ion HCO shown below Which of the following best represents the charge of each oxygen in this structure 1 O 2 3 1 1 2 2 3 1 2 1 3 C 0 H C

The magnetic moment of NiX41 ion is found to be zero Then the ion is X monodentate anionic ligand Question Type Single Correct Type 1 sp hybridized 2 spd2 hybridized

22 Fe 3 is more stable than Fe 2 the reason is are I 1st and 2nd I P difference is less than 11 0 eV III 2nd and 3rd IP difference is less than 11 0 eV The correct answer is 1 Only I 2 Only II II Core of Fe 3 is more stable IV IP of Fe 3 is high 3 I II and IV 4 II and I

71 The electrical resistance of 0 08 M caustic soda solution is 5 x 10 when placed in a column of diameter 2 cm and length 50 cm T conductivity of the solution is Take the value of n 3 A B 300 S cm 1 300 S cm CO300 Sam D O1 300 S cm 66822

Q6 Calculate the lines n spectrum produced in Paschen series when electron gets De excited from 5th shel and what will be the region of the spectrum 1x2 2

in heating an organic compound strongly with metallic sodium one frequently observes the formation of a blck material which is insoluble in water What might this black substance be and why is it formed

The molecular orbitals of 1 3 butadiene not in proper order are given below f1 f2 f3 f4 are the 2p orbitals on carbon atoms 0 372f1 0 602f2 0 602f3 0 372f4 V2 0 602f 0 372f2 0 372f3 0 602f4 V3 0 372f1 0 602f2 0 602f3 0 372f4 V4 0 602 1 0 372f2 0 372f3 0 602f4 The correct order of the orbitals with increasing energy is A C V1 V2 V3 V4 V3 V4 V1 V2 B D W3 V2 V4 V1 V4 V3 V2 V1

Variable valency is exhibited by ans Transitional elements Representative elements None of the above Inert gas

What do these line mean i The H H bo nd dissociation enthalpy is the highest for a single bond between two atoms o f any element ii It is because of this fal ctor that the dissociation of dihydrogen into its atoms is only 0 081 around 2 000K which increases to 95 5 at 500 OK iii Also it s relatively inert at room t emperature due to the high H H bond e nthalpy

Uza Which of the following is are correct A vander Waal s radius of iodine is more than its covalent radius B All isoelectronic ions belong to the same period of periodic table C First ionisation energy of Be is more than that of C D Electron affinity of N as well as noble gases is negative How many nodal suface can be present in the molecular orbital formed by the overlap of sand p x ax the molecular axis A 2 D None of these B 1 C 3 Which of the following show intramolecular hydrogen hor 57