CBSE Questions for Class 11 Medical Chemistry Structure Of Atom Quiz 7 - MCQExams.com

An isotope of helium is represented by the symbol $$_{ 2 }^{ 3 }{ He }$$. How many protons, neutrons and electrons are there in an atom of the isotope?
  • $$1$$ proton, $$2$$ neutrons, $$1$$ electron
  • $$1$$ proton, $$3$$ neutrons, $$2$$ electrons
  • $$2$$ protons, $$1$$ neutron, $$2$$ electrons
  • $$2$$ protons, $$3$$ neutrons, $$2$$ electrons
Which of the following statements is not true?
  • All forms of matter have volume
  • All forms of matter have colour
  • All forms of matter have mass
  • Matter can be living or non-living
 How many moles of electron weighs one kilogram?
  • $$6.023 \times 10^{23}$$
  • $$\dfrac{1}{9.108} \times 10^{32}$$
  • $$\dfrac{6.023}{9.108} \times 10^{54}$$
  • $$\dfrac{1}{9.108 \times 6.023} \times 10^{8}$$
__________is the nuclear process that transmutes uranium-238 into thorium-234.
  • Gamma decay
  • Nuclear fusion
  • Alpha decay
  • Positron emission
  • Nuclear fission
A sample of water is vaporized and tested in a mass spectrometer. There are $$3$$ isotopes of hydrogen, $$^{1}H, ^{2}H$$ and $$^{3}H$$. There are $$2$$ isotopes of oxygen, $$^{15}O$$ and $$^{16}O$$.
How many peaks would be expected to be found on the mass spectrum?
  • $$3$$
  • $$4$$
  • $$5$$
  • $$6$$
Beer's Law allows the measurement of the progress of a reaction by measuring the change of which of the following?
  • Temperature
  • Surface Area
  • Concentration
  • All of the above
Identify the error(s) in the orbital notation diagram for oxygen in the in the image $$a$$.
527400_05af4b4ba63d431282c3cd160b778c99.png
  • The electrons are not drawn with the appropriate spins
  • This is not a picture of oxygen. It is nitrogen
  • The electrons are not filled out according to Aufbau's Principle
  • The electrons are not filled out according to Hund's Rule
Statement I: The $$5s$$ orbital is filled after the $$4d$$ orbital
BECAUSE
Statement II: The $$5s$$ orbital has a lower energy than the $$4d$$ orbital
  • Statement $$1$$ and Statement $$2$$ are correct and Statement 2 is the correct explanation of Statement $$1$$
  • Both the Statement $$1$$ and Statement $$2$$ are correct and Statement $$2$$ is NOT the correct explanation of Statement $$1$$
  • Statement $$1$$ is correct but Statement $$2$$ is not correct
  • Statement $$1$$ is not correct but Statement $$2$$ is correct
  • Both the Statement $$1$$ and Statement $$2$$ are not correct
Given there are $$3$$ isotopes of hydrogen $$(^{1}H, ^{2}H$$ and $$^{3}H$$) and $$2$$ isotopes of oxygen $$(^{15}O$$ and $$^{16}O)$$, how many peaks would be expected on a mass spectrum for the hydronium ion, $$H_{3}O^{+}$$?
  • $$6$$
  • $$7$$
  • $$8$$
  • $$9$$
What are isotopes?
  • These are the forms of the same element having the same atomic number but different atomic masses due to different nuclear structure.
  • These are the forms of the same element having the different atomic number but different atomic masses due to different nuclear structure.
  • These are the forms of the same element having the same atomic number but same atomic masses due to different nuclear structure.
  • none of these
Scientists previously thought an atom looked like plum pudding. In this model, it was assumed that protons and electrons were distributed throughout the atom almost randomly. Which of the following contributions DISPROVED the Plum Pudding Model?
  • Rutherford's Gold Foil Experiment
  • J.J. Thomson's Cathode Ray Experiment
  • Millikan's Oil Drop Experiment
  • Bohr's Model of the Atom
Which experiment was developed on the plum pudding model of the atom?
  • Gold foil
  • Cathod ray tube
  • Emission spectra of hydrogen
  • Oil drop
Maximum number of electrons that an M-shell contain is/are _____________.
  • 32
  • 2
  • 8
  • 18
Rutherford model could not explain:
  • maxwell's theory of elctrodynamics
  • line spectra of atom
  • both A and B
  • None of these
Watermelon model of atom was proposed by:
  • Rutherford
  • Thomson
  • Bohr
  • Sommerfeld
Assertion (A) : Atoms with completely filled and half-filled subshells are stable.

Reason (R) : Completely filled and half-filled subshells have the symmetrical distribution of electrons and have maximum exchange energy.
  • Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
  • Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
  • Assertion is correct but Reason is incorrect
  • Assertion is incorrect but Reason is correct
If $$n=6$$, the correct sequence for filling of electrons will be:
  • $$ns\longrightarrow \left( n-1 \right) d\longrightarrow \left( n-2 \right) f\longrightarrow np$$
  • $$ns\longrightarrow \left( n-2 \right) f\longrightarrow np\longrightarrow \left( n-1 \right) d$$
  • $$ns\longrightarrow np\longrightarrow \left( n-1 \right) d\longrightarrow \left( n-2 \right) f$$
  • $$ns\longrightarrow \left( n-2 \right) f\longrightarrow \left( n-1 \right) d\longrightarrow np$$
According to the drawback of Rutherford's structure of atom electron should fall into the :
  • space
  • outer enviroment
  • shell
  • nucleus
If $$E_P$$ and $$E_k$$ represent potential energy and kinetic energy respectively, of an orbital electron, then according to Bohr's theory:
  • $$E_k= -E_p/2$$
  • $$E_k= -E_p$$
  • $$E_k= -2E_p$$
  • $$E_k= 2E_p$$
Which of the following statement in relation to the hydrogen atom is correct?
  • $$3s,3p$$ and $$3d$$ orbitals all have the same energy
  • $$3s$$ and $$3p$$-orbitals are of lower energy than $$3d$$-orbitals
  • $$3p$$-orbital is lower in energy than$$3d$$- orbital
  • $$3s$$-orbital is lower in energy than $$3p$$-orbital
The ionization energy of $${ Li }^{ 2+ }$$ is equal to
  • $$9 hcR$$
  • $$6 hcR$$
  • $$2 hcR$$
  • $$hcR$$
The density of water and ethanol at room temperature is $$1.0$$g $$/$$mL and $$0.789$$g$$/$$mL respectively. What volume of ethanol contains the same number of molecules as are present in $$100$$mL of water?
  • $$307.8$$mL
  • $$168.7$$mL
  • $$323.9$$mL
  • $$253.3$$mL
Choose one of the following definitions that give the correct meaning of matter :
  • anything that occupies space and has mass is known as matter.
  • anything that has definite shape and volume is known as matter.
  • anything that has mass but not definite shape is known as matter.
  • anything that is intangible is known as matter.
In Bohr's model, if the atomic radius of the first orbit $${r}_{1}$$, then radius of fourth orbit will be:
  • $$4{r}_{1}$$
  • $$6{r}_{1}$$
  • $$16{r}_{1}$$
  • $$\dfrac{{r}_{1}}{16}$$
The energy liberated when an excited electron returns to its ground state can have:
  • any value from zero to infinity
  • only negative values
  • only specified positive values
  • none of the above
Positronium is the name given to an atom-like combination formed between_____________.
  • a positron and a proton
  • a positron and a neutron
  • a positron and an $$\alpha$$-particle
  • a positron and an electron
According to classical theory, if an electron is moving in a circular orbit around the nucleus:
  • it will continue to do so for sometime
  • its orbit will continuously shrink
  • its orbit will continuously enlarge
  • it will continue to do so for all the time
On Bohr stationary orbits:
  • electrons do not move
  • electrons move emitting radiations
  • energy of the electron remains constant
  • angular momentum of the electron is $$\dfrac{h}{2 \pi}$$
The fundamental particles present in equal numbers in neutral atoms (atomic number $$71$$) are____________.
  • protons and electrons
  • neutrons and electrons
  • protons and neutrons
  • protons and positrons
Any $$p$$-orbital can accommodate up to:
  • $$4$$ electrons
  • $$2$$ electrons with parallel spins
  • $$6$$ electrons
  • $$2$$ electrons with opposite spins
Which of the properties of the elements is a whole number?
  • Atomic mass
  • Atomic number
  • Atomic radius
  • Atomic volume
Atomic number of an element represents__________.
  • number of neutrons in the nucleus
  • atomic mass of an element
  • valency of an element
  • number of protons in the nucleus
Bohr advanced the ideal of
  • stationary electrons
  • stationary nucleus
  • stationary orbits
  • elliptical orbits
Krypton (Atomic number $$36$$) has the electronic configuration $$\left[Ar\right] 4{s}^{2} 3{d}^{10} 4{p}^{6}$$. The $$37$$th electron will go into which one of the following sub-levels?
  • $$4f$$
  • $$4d$$
  • $$3p$$
  • $$5s$$
According to Aufbau principle, the correct order of energy of $$3d, 4s$$ and $$4p$$-orbitals is:
  • $$4p < 3d < 4s$$
  • $$4s < 4p < 3d$$
  • $$4s < 3d < 4p$$
  • $$3d < 4s < 4p$$
After $$np$$-orbitals are filled, the next orbital filled will be:
  • $$\left(n+1\right)s$$
  • $$\left(n+2\right)p$$
  • $$\left(n+1\right)d$$
  • $$\left(n+2\right)s$$
In which of the following orbital diagrams are both Pauli exclusion principle and Hund's rule violated?
The electronic configuration of an atom/ion can be defined by which of the following?
  • Aufbau principle
  • Pauli's exclusion principle
  • Hund's rule of maximum multiplicity
  • All of the above
Which among the following is incorrect of $$_{5}{B}$$ in normal state?  
After filling the $$4d$$-orbitals, an electron will enter in:
  • $$4p$$
  • $$4s$$
  • $$5p$$
  • $$4f$$
The orbital diagram which violates the 'aufbau principle' is:
What is ratio of time periods $$\left( { { T }_{ 1 } }/{ { T }_{ 2 } } \right) $$ in second orbit of hydrogen atom to third orbit of $${He}^{+}$$ ion?
  • $$\dfrac { 8 }{ 27 } $$
  • $$\dfrac { 32 }{ 27 } $$
  • $$\dfrac { 27 }{ 32 } $$
  • $$\dfrac { 27 }{ 8 } $$
Binding energy per nucleon of three nuclei $$A$$, $$B$$ and $$C$$ are $$5.5$$, $$8.5$$ and $$7.5$$ respectively. Which one of the following nuclei is most stable?
  • $$A$$
  • $$C$$
  • $$B$$
  • Cannot be predicted
Arrangement of the following group of orbitals in which they fill with electrons :
(5f, 6p, 4p, 6s, 4d, 4f )
  • $$4p, 4d, 6s, 4f, 6p, 5f$$
  • $$6s, 4d, 4f, 5f, 4p, 6p $$
  • $$6s, 4p, 4d, 4f, 5f, 6p$$
  • $$4d, 4p, 4f, 5f, 6s, 6p$$
Which of the following sets of quanta numbers could represent the last electron added to complete the electronic configuration for a ground state atom of Br (Z = 35)? 
  • $$4, 0, 0,  - \cfrac {1}{2}$$
  • $$4, 1, 1, - \cfrac {1}{2}$$
  • $$3, 1, 1, - \cfrac {1}{2}$$
  • $$4, 1, 2,  + \cfrac {1}{2}$$
Which of the following pairs is correctly matched ? 
  • Experimental observation - (a) X-ray spectra

    Phenomenon - Charge on the nucleus
  • Experimental observation - (b) a- particle scattering

    Phenomenon - Quantized electron orbit
  • Experimental observation - (c) Emission spectra

    Phenomenon - Quantization of energy
  • Experimental observation - (d) The photoelectric effect

    Phenomenon - The nuclear atom
The ratio of kinetic energy and the total energy of the electron in the nth quantum state of Bohr's atomic model of hydrogen atom is 
  • $$-2$$
  • $$-1$$
  • $$+2$$
  • $$+1$$
In the Bohr's model of the atom:
  • the radius of $$n$$th orbit is proportional to $${ n }^{ 2 }$$
  • the total energy of the electron in the $$n$$th orbit is inversely proportional to '$$n$$'
  • the angular momentum of the electron is integral multiple of $${ h }/{ 2\pi }$$
  • the magnitude of potential energy of an electron in an orbit is greater than kinetic energy
$$0.25 g$$ of an element $$M$$ reacts with excess fluorine to produce $$0.547 g$$ of the hexafluoride $$MF_6$$. What is the element?
  • $$Cr$$
  • $$Mo$$
  • $$S$$
  • $$Te$$
Which electron,orbitals are designated by
(i) n= 2, l=1, m= 0;
(ii)n= 3, l= 2, m= 0;
(iii)n = 4, l = 2, m = 1 and
(iv) n = 5, I= 3, m =3 respectively ?
  • 2p, 3d, 4d and 5f, respectively
  • 2p, 3d, 4d and 5d, respectively
  • 2p, 3d, 4f and 5f, respectively
  • 2p, 3p, 4d and 5f, respectively
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