CBSE Questions for Class 11 Medical Chemistry Structure Of Atom Quiz 1 - MCQExams.com

The magnetic field at the center of a hydrogen atom due to the motion of electron varies with the principal quantum number as
  • $$n^{5}$$
  • $$n^{3}$$
  • $$1/n^{5}$$
  • $$1/n^{3}$$
The equivalent weight of a metal is 4.5 and the molecular weight of its chloride isFind the atomic weight of the metal.
  • 9
  • 12
  • 15
  • 18
Which of the following statements about the radioactivity of an element is incorrect?
  • It is a nuclear property
  • It does not involve any rearrangement of electrons
  • Its rate is affected by change in temperature and/or pressure
  • It remains unaffected by the presence of other element or elements chemically combined with it
The Bohr model for the spectra of a H- atom
  • will not be applicable to hydrogen in the molecular from.
  • Will not be applicable for a He - atom
  • is valid only at room tempreture.
  • predicts continuous as well as discrete spectral lines.
An element 'A' emits an $$\alpha$$ -particle and forms 'B'. 'A' and 'B' are
  • Isotopes
  • Isobars
  • Isotones
  • Isodiapheres
Ejection of the photoelectron from metal in the photoelectric effect experiment can be stopped by applying $$0.5\ V$$ when the radiation of $$250\ nm$$ is used. The work function of the metal is:
  • $$5.5\ eV$$
  • $$4\ eV$$
  • $$5\ eV$$
  • $$4.5\ eV$$
Which of the following has the correct combination considering $$List-I$$ and $$List-II$$?
  • $$(II),(R)$$
  • $$(II),(Q)$$
  • $$(I),(P)$$
  • $$(I),(T)$$
For which one of the following, Bohr model is not valid?
  • Singly ionised helium atom $$(He^+)$$
  • Deuteron atom
  • Singly ionised neon atom $$(Ne^+)$$
  • Hydrogen atom
Assertion: Atoms are not electrically neutral.
Reason: Number of protons and electrons are different.
  • Assertion and reason both are correct statements and reason is correct explanation for assertion.
  • Assertion and reason both are correct statements but reason is not correct explanation for assertion.
  • Assertion is correct statement but reason is wrong statement.
  • Assertion is wrong statement but reason is correct statement.
  • Both assertion and reason statements are wrong.
  • 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.
  • Both Assertion and Reason are incorrect.
Which of the following electronic configurations has maximum energy ?
What would be the radius of second orbit of $${He}^{+}$$ ion?
  • $$1.058\mathring { A } $$
  • $$3.023\mathring { A } $$
  • $$2.068\mathring { A } $$
  • $$4.458\mathring { A } $$
$$X$$ and $$Y$$ are the two atomic species:

$$X$$$$Y$$
Number of Proton$$8$$$$8$$
Number of Neutron $$8$$$$10$$

Select the correct statement about $$X$$ and $$Y$$.
  • $$X$$ and $$Y$$ are isobars
  • $$X$$ and $$Y$$ have different chemical properties
  • $$X$$ and $$Y$$ have different physical properties
  • $$X$$ and $$Y$$ are the atoms of different elements
The valence electrons of magnesium is different in ........... quantum number. 
  • $$m$$
  • $$n$$
  • $$l$$
  • $$s$$
Though the three fundamental particles are present in almost all elements, one element does not have one of them. Identify the particle
  • neutron
  • proton
  • electron
  • nucleons
According to Bohr hypothesis, discrete quantity is
  • Momentum
  • Angular velocity
  • Potential energy
  • Angular momentum

Bohr Magneton value in S.I. Units is:
  • $$9.273\times 10^{-24} erg T^{-1}$$
  • $$9.273\times 10^{-24} JT^{-1}$$
  • $$9.273\times 10^{-17} JT^{-1}$$
  • $$9.273\times 10^{-10} calT^{-1}$$
Substances having same number of electrons but different mass is known as:
  • isotopes
  • isobars
  • isotones
  • allotropes
Bohrs atomic model assumes :
  • the nucleus is of infinite mass and is at rest
  • electron in a quantized orbit will not radiate energy
  • mass of the electron remains constant
  • all of the above
A proton is identical to:
  • The nucleus of helium
  • The nucleus of a hydrogen atom
  • A molecule of a hydrogen
  • An atom of hydrogen
The first model of an atom was given by _____________.
  • N. Bohr
  • E. Goldstein
  • Rutherford
  • J.J. Thomson
Electron has nearly the equal mass as that of a/an:
  • proton
  • neutron
  • positron
  • $$\alpha$$-particle
The electrons are filled in various sub levels according to the order of their energies, is known as:
  • Aufbau principle
  • Pauli's principle
  • Hund's rule
  • $$nl^{x}$$ principle
Atomic number of platinum is?
  • 68
  • 78
  • 74
  • 64
Element having atomic number 33 belongs to this group?
  • III
  • IV
  • V
  • VI
A particle deflects towards negative plate in the presence the electric field. Identify the particle?
  • Neutron
  • Electron
  • X-ray
  • Proton
Which of the following quantities can only be a whole number?
  • Atomic radius
  • Atomic number
  • Mass number
  • Equivalent weight
For an atom of a given element, the number of electrons equals to:
  • the number of protons $$+$$ number of neutrons
  • the atomic number of the element
  • the number of proton $$-$$ number of neutrons
  • the mass number of the element
When the 3d orbital is complete, the new electron will enter in:
  • 4p-orbital
  • 4f orbital
  • 4s orbital
  • 4d-orbital
Atomic number of calcium is ?
  • 18
  • 19
  • 20
  • 21
Which of the following has the same number of protons?
  • Isobars
  • Isoelectronic
  • Isotopes
  • Isotones
Who is regarded as father of modern chemistry ?
  • Ruterford
  • Einstien
  • Lavoisier
  • C.V Raman
The electronic configuration of $$He$$ is $$2$$ and that of oxygen is:
  • $$2,4$$
  • $$2,5$$
  • $$2,6$$
  • $$2,6,1$$
The relation between atomic number (Z) and atomic mass (A) for light elements is given by :
  • $$A=Z$$
  • $$A=2Z$$
  • $$2A=Z$$
  • $$A=4Z$$
Bohr proposed his atomic model based on :
  • oil drop experiment
  • planck's quantum theory
  • $$\alpha$$-ray scattering experiment
  • experiments on conduction of gases
The quantity of matter present in an object is called its ___________.
  • weight
  • volume
  • mass
  • density
Which of the following is not true for atomic number?
  • It indicates the number of protons in the nucleus
  • It is represented usually by Z
  • It is identical with the mass number
  • It is constant for a given element
Which of the following is correct for a proton?
  • It is a nucleus of deuterium.
  • It is an ionised hydrogen molecule.
  • It is an ionised hydrogen atom.
  • It is an $$\alpha$$ - particle.
Sub atomic particles of atoms are:
  • protons
  • electrons
  • neutrons
  • all of these
An αα particle is:
  • a hydrogen molecule
  • a helium nucleus
  • an electron
  • a proton
The atomic number of an element is determined by:
  • the number of electrons in one atom
  • the number of neutrons in one atom
  • the valency of the element
  • the number of protons in one atom
Identify the sub atomic particles of atoms.
  • Protons
  • Electrons
  • Neutrons
  • All of the above
The atomic number of an element is $$7$$. This implies that its nucleus contains :
  • $$7$$ electrons
  • $$7$$ protons
  • $$7$$ neutrons
  • $$7$$ protons and $$7$$ electrons
Atomic number is given by the number of _____ of an atom.
  • protons
  • neutrons
  • electrons
  • All of the above
Thomson proposed the model of an atom similar to :
  • christmas tree
  • christmas pudding
  • chocolate
  • none of the above
All the atoms of same element have same _______.
  • mass number
  • atomic number
  • atomic mass
  • All of the above
The ratio of energy to frequency of a radiation emitted by an electron is equal to :
  • wave length
  • velocity of electron
  • bohr's radius
  • planck's constant
Who suggested the distribution of electrons into different orbits of an atom?
  • E. Goldstein
  • Ernest Rutherford
  • Bohr and Bury
  • Dalton
What makes the atom of one element different from another element's atom ?
  • Number of protons
  • Number of electrons
  • Number of neutrons
  • Number of ions
Who was the first scientist to propose a model for the structure of an atom?
  • J.J. Thomson
  • Dalton
  • Ernest Rutherford
  • E. Goldstein
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