CBSE Questions for Class 11 Medical Chemistry Structure Of Atom Quiz 10 - MCQExams.com

The Bohr radius of the fifth electron of phosphorus (atomic number = 15) acting as dopant in silicon (relative dielectric constant = 12) is 
  • 10.6$$\ { A^0 }$$
  • 0.53$$\ {   { A ^0} }$$
  • 21.2$$ { A^0 }$$
  • None of these
Ratio of series limit of Brackett and Pfund series of hydrogen ato spectrum is
  • $$\dfrac{1}{4}$$
  • $$\dfrac{4}{9}$$
  • $$\dfrac{9}{16}$$
  • $$\dfrac{16}{25}$$
The radius of $$He^+$$ ion is $$x\ \mathring{A}$$  in its ground state. The radius of $$Li^{2+}$$ ion in the ground state ($$ \mathring{A}$$ ) is:
  • $$\dfrac{2x}{3}$$
  • $$\dfrac{3x}{2}$$
  • $$\dfrac{2}{3x}$$
  • $$\dfrac{3}{2x}$$
The heaviest subatomic particle of an atom is___
  • neutron
  • positron
  • proton
  • electron
$$M^{3+}$$ (mass number $$56$$) contains $$30.4\%$$ more neutrons than electrons. Thus, atomic number of the ion is.
  • $$23$$
  • $$24$$
  • $$25$$
  • $$26$$
Which one of the following is considered as the main postulate of Bohr's model of atom
  • Protons are present in the nucleus
  • Electrons are revolving around the nucleus
  • Centrifugal force produced due to the revolving electrons balances the force of attraction between electron and protons
  • Angular momentum of electron is an integral multiple of $$\dfrac{h}{2\pi}$$
Which one of the following species will give  a series of spectral lines similar to that of $$Mg^{2+}$$?
  • $$Al^{3+}$$
  • $$Na$$
  • $$Mg^+$$
  • $$F$$
Identify the incorrect statement among the following:
  • $$4f$$ and $$5f$$ orbitals are equally shielded
  • d-Block elements show irregular and erractic chemical properties among themselves.
  • $$La$$ and $$Lu$$ have partially filled d-orbitals and no other partially filled orbitals.
  • The chemistry of various lanthanoids is very similar.
Equivalent electric current created by electron of a H-atom in its ground using Bohr's model is nearly
  • $$2.14\times {10}^{-35}A$$
  • $$4.48\times {10}^{-30}A$$
  • $$24\times {10}^{-30}A$$
  • $$70\times {10}^{-35}A$$
In hydrogen atom, the electron is making $$6.6\times 10^{15}rev/s$$ around the nucleus in an orbit of radius $$0.528A^0$$. The equivalent magnetic dipole moment is :
  • $$1\times 10^{-15}Am^2$$
  • $$1\times 10^{-10}Am^2$$
  • $$1\times 10^{-23}Am^2$$
  • $$1\times 10^{-27}Am^2$$
According to Bohr's theory radius of $$n^{th}$$ shell is given as $$\dfrac {1}{r_{n}}\propto Z^{y}$$ ($$Z$$ is atomic number). Here $$'y'$$ is:
  • $$-1$$
  • $$1$$
  • $$2$$
  • $$-2$$
The number of electrons having $$n+s=2.5$$ in sulphide ion is :-
  • $$3$$
  • $$4$$
  • $$6$$
  • $$8$$
A $$p -$$orbital can accommodate upto:
  • Four electrons
  • Six electrons
  • Two electrons
  • Eight electons
The radius of the orbit of an electron in a Hydrogen-like atom is $$3{ a }_{ 0 }$$, where $${ a }_{ 0 }$$ is the Bohr radius. Its orbital angular momentum is $$\frac { 3h }{ 2\pi  } $$. It is given that h is Planck's constant and R is Rydberg constant. The possible wavelength, when the atom de-excites is :
  • $$\dfrac { 4 }{ 5R } $$
  • $$\dfrac { 4 }{ 9R } $$
  • $$\dfrac { 1 }{ 2R } $$
  • $$\dfrac { 9 }{ 32R } $$
Any $$nf-$$ orbital can accommodate upto:-
  • $$14$$ electron
  • Six electrons
  • Two electrons with parallel spin
  • Two electrons with opposite spin
The velocity of the electron in 3rd orbit of hydrogen atom in $$cms^{-1}$$
  • $${ 4.88\times 10 }^{ 4 }$$
  • $${ 2.44\times 10 }^{ 8 }$$
  • $${ 7.29\times 10 }^{ 7 }$$
  • $${ 2.44\times 10 }^{ 12 }$$
In a hydrogen like sample electron is in 2nd excited state,the energy of the 4th state of this sample is -13.6 eV,then the incorrect statement is:
  • Atomic number of element is 4.
  • 3 different types of spectral lines will be observed if electrons make transition upto ground state from the 2nd excited state.
  • A 25 eV photon can set free the electron from the 2nd excited state of this sample
  • 2nd line of Balmer series of this sample has same energy value as 1st excitation energy of H-atom
Which one of the following complex ions is expected to absorb visible light? 
  • $$[Cu(NH_3)_4]^+$$
  • $$[Cu(NH_3)_4]^{+2}$$
  • $$[Zn(H_2O)_6]^{+2}$$
  • $$[Zn(H_2O)_6]^{+3}$$
A stationary $$He^+$$ ion emitted a photon corresponding to the first line of the Lyman series. The photon liberates a photo electron from a stationary hydrogen atom in ground state. The kinetic energy?
  • $$10.2 eV$$
  • $$13.6 eV$$
  • $$20.4 eV$$
  • $$27.2 eV$$
The maximum number of electrons that can be contained in 
  • $$\text{4f  subshell}$$
  • $$3^{rd}\ \text{shell}$$
  • $$\text{Both (A) and (B)}$$
  • $$\text{Neither (A) nor (B)}$$
The electron present in penultimate orbit of coinage metal atom are:-
  • 8
  • 18
  • 2
  • 32
Consider the electronic configuration $$1s^{2}\ 2s^{2}\ 2p_{x}^{2}$$
  • It violates Aufbau principle.
  • It violates Hund's rule
  • It violates Pauli's exclusion principle.
  • It is correct.
If the velocity of an electron moving in first Bohr's orbit of hydrogen has to be reduced to$$7.27\times 10^{5}ms^{-1}$$ it should be shifted from its existing position by
  • $$4.23\mathring{A}$$ away from nucleus
  • $$4.23\mathring{A}$$ towards nucleus
  • $$4.76\mathring{A}$$ away from nucleus
  • $$4.76\mathring{A}$$ towards nucleus
In Bohr series of lines of hydrogen spectrum, third line from the red end corresponds to which one of the following inner orbit jumps of electron for Bohr's orbit in atom of hydrogen 
  • $$4\rightarrow 1$$
  • $$2\rightarrow 5$$
  • $$3\rightarrow 2$$
  • $$5\rightarrow 2$$
The $$71^{st}$$ electron of an element $$X$$ with an atomic number of $$71$$ enters into the orbital:
  • $$4f$$
  • $$6p$$
  • $$6s$$
  • $$5d$$
The electron in hydrogen atom is in the first Bohr's orbit (n=1). The ratio of electronic transition energies, $$ \Delta E(n=1\rightarrow n=3)\  to \ \Delta E(n=1\rightarrow n=2)\  is $$:
  • 32/27
  • 16/27
  • 32/9
  • 8/9
Electronic transition in $${\text{H}}{{\text{e}}^{\text{ + }}}$$ would emit light in which region when $${{\text{e}}^{\text{ - }}}$$ jumps from fourth orbit to second orbit :
  • UV
  • Visible
  • IR
  • No spectral region cab be defined
The first three radius ratio of Bohr orbits
  • $$1:0.5:0.5$$
  • $$1:2:3$$
  • $$1:4:9$$
  • $$1:8:27$$
The ratio of the radii of the first three Bohr orbit in H atom is 
  • $$1:\dfrac { 1 }{ 2 } :\dfrac { 1 }{ 3 } $$
  • $$1:2:3$$
  • $$1:4:9$$
  • $$1:8:27$$
How many carbon atoms are present in palmitic acid?
  • $$16$$
  • $$20$$
  • $$18$$
  • $$12$$
Imagine an atom made up of proton and a a hypothetical particle of double the mass of the electron but having the same charge as the electron. Apply the Bohr atom model and consider all possible transitions of this hypothetical particle to the first excited level. The longest wavelength photon that will be emitted has wavelength $$\lambda $$ (give in term of the Rydberg constant R for the hydrogen atom) equal to
  • 9/5 R
  • 36/5 R
  • 18/5 R
  • 4/ R
The effective atomic number of Mn,in $$Mn_{2}(CO)_{10}$$is _____.
  • 36
  • 38
  • 32
  • 34
If the Thomson model is correct what should be the observation in the $$\alpha  - ray$$ scattering  experiment 
  • All the $$\alpha - ray$$ should pass through the gold foil
  • Only few $$\alpha - ray$$ should pass through the gold foil
  • 98% of $$\alpha - ray$$ should get reflected back
  • Both B & C
 In a Bohr's model of an atom, when an electron jumps from n = 1 to n = 3, how much energy will be emitted?
  • $$2.15\times10^{-11}$$ ergs
  • $$2.389\times10^{-12}$$ ergs
  • $$0.239\times10^{-10}$$ ergs
  • $$0.1936\times10^{-10}$$ ergs
The distance between $$3^{rd}$$ & $$2^{nd}$$ Bohr orbit $$He^{+}$$ is 
  • $$2.645\ A^o$$
  • $$1.322\ A^o$$
  • $$0.2645\ A^{o}$$
  • $$None\ of\ these$$
According to Bohr's model, if the kinetic energy of an  electron in $$2^{nd}$$ orbit of $$He^{+}$$ is $$x$$, then what should be the ionisaion energy of the electron revolving in $$3^{rd}$$ orbit of $$m^{5+} ions>$$
  • $$X$$
  • $$4X$$
  • $$x/4$$
  • $$2X$$
The atomic number of an element represents :
  • number of neutrons in the nucleus
  • number of protons in the nucleus
  • atomic mass of element
  • valency of element
Neutrons is a fundamental particle carrying 
  • A charge of + 1 unit and a mass of 1 unit
  • no charge and a mass of 1 unit
  • no charge and no mass
  • a charge of - 1 and a mass of 1 unit
If an electron moves away from nucleus, its potential energy:
  • decreases
  • not changes
  • increases
  • none of these
$$E_n=-\dfrac{313.6}{n^2}$$, if the value of $$E_i=-34.84$$ to which value '$$n$$' corresponds:
  • $$2$$
  • $$4$$
  • $$1$$
  • $$3$$
$$\dfrac { weight\quad of\quad one\quad atom\quad of\quad an\quad element }{ Its\quad atomic\quad weight } =x.$$
$$\dfrac { weight\quad of\quad one\quad molecule\quad of\quad a\quad compound }{ Its\quad molecular\quad weight } =y.$$
Then, x : y is
  • $$1:\frac { 1 }{ 12 } $$
  • $$2:1$$
  • $$1:2$$
  • $$1:1$$
Which of the following pairs is not correctly matched 
  • Effective ato,ic number of Pt in $${ \left[ { PtCl }_{ 6 } \right] }^{ 2- }$$
  • Absorption peak for $${ \left[ { Cr }^{ m }{ \left( { NH }_{ 3 } \right) }_{ 6 } \right] }^{ +3 }=21680{ cm }^{ -1 }$$
  • Crystal field stabilization energy of $${ d }^{ 2 }$$ in weak ligand field $$=\left( - \right) 0.8{ \Delta }_{ 0 }$$
  • Example of weak ligand field for $${ d }^{ 5 }$$ configuration $${ d }^{ 5 }$$
The energy of electron in the excited state of hydrogen atom is $$-0.85 eV$$. If 'h' is Plank's constant, the angular momentum of electron in the excited state is :
  • $$\dfrac{4h}{2 \pi}$$
  • $$h$$
  • $$\dfrac{3 h}{2 \pi}$$
  • $$\dfrac{h}{\pi}$$
How many spectral line of balmer series present in visible region?
  • $$5$$
  • $$4$$
  • $$2$$
  • $$3$$
The average atomic mass of a sample of an element X is 16.2u. What are the percentage of isotope $$^{16}_8X$$ and $$^{18}_8X$$ in the sample respectively?
  • $$90$$%, $$10$$%
  • $$80$$%, $$20$$%
  • $$10$$%, $$90$$%
  • $$20$$%, $$80$$%
General electronic configuration of  outermost and penultimate shell is  $$(n-1)s^{2}(n-1)p^{6}(n-1)d^{x}ns^{2}$$  If n = 4 and x = 5,  then number of protons in  the nucleus will be :- 
  • > 25
  • < 24
  • 25
  • 30
The process of successive addition of protons to the nucleus followed by an addition of the same number of electrons to the available orbitals in the sequence of increasing energy to obtain the electronic configuration of many electron atom is known 
  • Pauli's exclusion principle
  • Hund's rule
  • Heisenberg's uncertainty principle
  • Aufbau principle
Which of the following has the correct combination considering List-I and List-II
  • $$(III),(S)$$
  • $$(IV),(Q)$$
  • $$(III),(P)$$
  • $$(IV),(U)$$
What are isotopes of an element?
  • Atoms of a different element with a different number of neutrons
  • Atoms of a different element with a different number of protons
  • Atoms of the same element with a different number of neutrons
  • Atoms of the same element with a different number of protons
Twenty molecular of $$SO_3$$ will weight as much as _____ molecular of oxygen.
  • $$100$$
  • $$50$$
  • $$15$$
  • $$8$$
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