Call me

Have a Query? We will call you right away.

+91

E.g: 9876543210, 01112345678

We will give you a call shortly, Thank You

Office hours: 9:00 am to 9:00 pm IST (7 days a week)

What are you looking for?

Syllabus

what are

ISOELECTRONIC SPECIESand give examples.a block of mass 'm' is placed on a smooth wedge of inclination of theta.the whole system is accelerated horizontally so that the block does not slip on the wedge.The force exerted by the wedge on block has a magnitude.

Why is Fe

^{3+ }ion more stable than Fe^{2+}ion?^{16}Hz, emits photoelectrons with twice kinetic energy as did photo electrons when the same metal is irradiated by light of frequency 2*10^{16}Hz. Find the threshold frequency of the meatl?drawbacks of j j thomson atomic models

(1) 52.2 kcal/mol (2) 93.4 kcal/mol

(3) 63.4 kcal/mol (4) 100 kcal/mol

What will be total spin of Fe3+ ion? As its have 3 valence electrons ...spin shoud be 3 x 1/2 but ans. is 5x1/2...how is it possible.please give suitable explanation and common method to find total spin for ions?

explain pauli's exclusion principle

_{e}=9.11x10^{-31}KgWhat's is hunds rule of maximum multiplicity Explain with many example and how is it different from the other

Why is electron gain enthalpy of chlorine is more than fluorine?

Q.) Which transition of Li

^{2+ }is associated with same energy change as n=6 to n=4 transition in He^{+}.(I) n=3 to n=1 (II) n=8 to n=6 ( III) n=9 to n=6 (IV) n=2 to n=1

Calculate the energy associated with the 1st orbit of He+. What is the radius of the orbit?

Pls give the answer in steps..!

a) 9,1

b)10,1

c) 10,2

d) 4,-4

Could you please explain what's spin multiplicity?

calculate mass of photon with wavelength 3.6 A

^{.}?In a sample of H- atom, electron makes transition from 5

^{th}exited state upto ground state, producing all possible types of photons. Then number of lines in the infrared region are :(A) 4

(B) 5

(C) 6

(D) 3

why electon cannot exist in the nucleus?

(A)n=3 of H-atom

(B)n=4 of C5+ ion

(C)n=6 of Be3+ ion

(D)n=3of He+ ion

Answer is (B)

No Links Please !!

Please solve and explain !!

ratio of e/m of electron and alpha particle is

the first emission line in the atomic spectrum of hydrogen in the balmer series appears at-

1. 5R/36 /cm 2.3R/4/cm 3.7R/144/cm 4.9R/400/cm

what is the maximum number of electrons which can be accommodated in an atom in which the highest principal quantum number values is 4?

Calculate the wave number for the longest wavelength transition in the Balmer series of atomic hydrogen.

With solution

What is the derivation of the radius of the n

^{th}orbit in bohr's model?the formula is R

_{n}= (4Ï€Îµ_{0})n^{2}h^{2 }/ 4Ï€^{2}me^{2}Write the electronic configuration of (i) Mn4+, (ii) Fe3+ (iii) Cr2+ and Zn2+ Mention the number of

unpaired electrons in each case.

r is

In an atom two electrons move around the nucleus in circular orbit of radii R and 4R. The ratio of time taken by them to complete one revolution is

(a)1:8 (b)4:1 (c)1:4 (d)8:7

^{x+}(atomic number M=25) is root of 15 Bohr Magneton. The number of unpaired electrons and the value of X respectively are? Also please explain Magnetic Moment?Why do half filled and completely filled orbitals have extra stability?

Calculate the wavelength of first and last line in the Balmer series of Hydrogen spectrum.

Calculate the wave number of the spectral lines of shortest wave length appearing in the balmer series of hydrogen spectrum. given , R=1.09 * 10 to the power of 7 m-1.

state Heisenberg's Uncertainty principle?

Give any 5 differences between ORBIT ORBITALS

^{+ }is -871.6 x 10^{-20 }J.the energy of the electron in the first orbit of hydrogen would be ?The mass of an electron is 9.1x10

^{-31}kg.If its kinetic energy is 3.0x10^{-25}J.CALCULATE ITS WAVELENGTH........Cl------> Cl+?+ e-?by the energy liberated from the following process:

? Cl + e -----> Cl-?for 6 x1023atoms

given that electron affinity of chlorine is 3.61 eV and ?ionization energy of chlorine is 17.422 eV.

Light of wavelength 5000 A falls o n a metal surface of work function 1.9 eV . Find (a ) the energy of photons (b) kinetic energy of photoelectrons . [1eV = 1.6 * 10 (-19) J ] please answer fast

a) 2pi x

b) 6pi x

c)9x

d)x/3

why are bohr's orbits called stationary states?

calculate the mass and charge of one mole of electron?

Find (a) the total number and (b) the total mass of neutrons in 7 mg of

^{14}C.(Assume that mass of a neutron = 1.675 × 10

^{–27}kg).a) 20 x 10

^{14}Hzb) 10 x 10

^{14}Hzc) 5 x 10

^{14 }Hzd) 1 x 10

^{14}HzExplain and derive schrodinger wave equation for hydrogen and hydrogen like species.

With what velocity should an alpha particle travel towards the nucleus of a copper atom so as to arrive at a distance 10

^{-13}m from the nucleus of a copper atom?Calculate the mass of a photon of sodium light having wavelength 5894 A

^{0}& velocity as 310^{8 }ms^{- 1}Calculate energy of one mole of photons

what are the frequency and wavelenght of a photon emitted during a transition from n=5 state to n=2 state in the hydrogen atom

_{3s}=(1/81(3π)^{1/2})(1/a_{0})^{3/2}[27- 18r/a_{0}+ 2r^{2}/a_{0}] e^{r/3 a0}The above mentioned orbital (3s) has two nodes at 1.99a_{0}and xa_{0}. What is the approximate value of x? (a) 9 (b) 7 (c) 6 (d) 2what is the difference between 2O and O

_{2}how many nodal planes are there in dz

^{2 }orbital ??? ( most of the authors wrote 2 , bt sme renowned experts wrote ZERO ) so m confused between zero n two ???DIFFERENCE BETWEEN WAVE AND PARTICLE NATURE? IN BRIEF

What is photoelectric effect?

An element has electronic configuration [Ar] 3d4 in its +3 oxidation state.What will be the electronic configuration of its atom?

How many photons of light having a wavelength 400 nano meter are necessary to provide 1 joule of energy?

calculate the no. of protons in 10g of CaCO

_{3}. N_{A}=6.02* 10^{23.}correct set of quantum number for unpaire electron in chlorine

Two particles A and B are in motion. If the wavelength associated with particle A is 5x10^-8m, calculate wavelength associated with B if its momentum is half of A

a) 2s, 2p?x, 3d?xy?

b) 3s, 2p?z,?3dz2?

c) 2s, 2p?z,?3d?x2?- y2?

d) 3s, 3p?x,?3d?yz

The kinetic energy of a subatomic particle is 5.85x10^-25 J. Calculate the frequency of the particular wave.

In a Bohr's model of atom when an electron jumps from n=1 to n=3, how much energy will be emitted or absorbed?

a) 2.15*10

^{-11}ergb) 0.1911*10

^{-10}ergc) 2.389*10

^{ -12 }ergd) 0.239*10

^{-10}ergWhat is black body radiation?difference between notation of 'l' and 'L'.

A 100 watt bulb emits monochromatic light of wavelength 400 nm. Calculate

the number of photons emitted per second by the bulb.What are planck's postulates..??

Electromagnetic radiation of wavelength 242 nm is just sufficient to ionise the sodium atom. Calculate the ionisation energy of sodium in kJ mol

^{–1}.what is the difference between absorption and emission spectrum

how many nodal planes are there for principle quantum number n=3. plz explain in detail.

What are quantum numbers?

calculate the wavelength , frequency nd wavenumber of a light wave whose period is 2.0 x 10

^{-10}