CBSE Questions for Class 11 Medical Chemistry Structure Of Atom Quiz 6 - MCQExams.com

Elements are characterized by the ______ of their atoms.
  • electrons
  • mass
  • protons
  • shape
The mass number of nucleus is :
  • Sometimes equal to its atomic number
  • Sometimes less than and sometimes more than its atomic number
  • Always less than its atomic number
  • Always more than its atomic number
Which of the following is not an example of matter?
  • Chair
  • Air
  • Almonds
  • Touch
How can an element be defined as consisting of any mixture of atoms with a given atomic number?
  • Determines the mass of of element in the mixture
  • Determines the chemical properties of an element
  • Both A and B
  • None of the above
In Thomson's model, _________ are embedded in a positively charged 'soup'.
  • electrons
  • neutrons
  • protons
  • ions
Which of the following disproved Thomson's model?
  • The nuclear model of an atom
  • The electron model of an atom
  • The atomic model of an atom
  • None of above
____________ is an obsolete scientific model of the atom proposed by J. J. Thomson in $$1904$$.
  • Musk melon model
  • Plum pudding model
  • Christmas melon model
  • Pudding model
On the basis of composition, which of the following is a type of matter?
  • Compound
  • Solid
  • Liquid
  • Both b and c
Thomson's atomic model is also called :
  • water melon model
  • christmas pudding model
  • both a and b
  • none of above
How many orbitals are there in the second principal energy level, n = 2, of an atom?
  • $$1$$
  • $$9$$
  • $$4$$
  • $$16$$
Which sublevel can occupy a maximum of 10 electrons?
  • s
  • f
  • p
  • d
The electronic configuration $$\displaystyle { 1s }^{ 2 },{ 2s }^{ 2 },{ 2p }^{ 6 },{ 3s }^{ 2 },{ 3p }^{ 6 },{ 3d }^{ 9 }$$ represents a:
  • metal atom
  • non-metal atom
  • non-metallic anion
  • metallic cation
J.J. Thomson received noble prize in the year: 
  • $$1900$$
  • $$1906$$
  • $$1909$$
  • $$1920$$
Radioactive changes and ordinary chemical changes are different, because radioactive changes:
  • are explosive
  • gain energy
  • happens in the nucleus
  • release energy
Bohr's atom model assumes.
  • The nucleus is of infinite mass and is at rest
  • Electrons in a quantized orbit will not radiate energy
  • Mass of electron remains constant
  • All the above.
Which one contains up to ten electrons from the following?
  • $$1s$$
  • $$2s$$
  • $$3s$$
  • $$3p$$
  • $$3d$$
 Which of the following can occupy space and has mass?
  • Density
  • Weight
  • Matter
  • A solid
  • Volume
Which of the following cannot be accelerated?
  • $$\alpha$$-particle
  • $$\beta$$-particle
  • Protons
  • Neutrons
Which of the following contains up to $$10$$ electrons.
  • $$1s$$
  • $$2s$$
  • $$3s$$
  • $$3p$$
  • $$3d$$
 Thomson's atomic model suggested that the atom is:
  • not divisible
  • divisible
  • electrons revolve around nucleus
  • both A and C
Isotopes have same : 
  • atomic mass
  • atomic number
  • atomic radius
  • electronegativity
  • ionization potential
X is defined by the number of protons. What is X?
  • Cation
  • Inert Gas
  • Crystal
  • Anion
  • Element
Which element has a mass number of 20 and contains 11 neutrons?
  • Copper
  • Gallium
  • Calcium
  • Sodium
  • Fluorine
What happens when both of the orbitals in a molecule are in phase, either both positive or both negative and the electrons in the bonds are at their lowest energy level?
  • Bonding takes place.
  • The chemicals don't react.
  • The atoms don't bond.
  • Bonding doesn't take place.
  • The electrons in the atoms don't share orbitals.
Which statement below is not acceptable with the concept of isotopes?
  • Each elements is composed of atoms
  • All atoms of an element are identical
  • The atoms of different elements have different chemical and physical properties
  • The combining of elements leads to the formation of compounds
  • In a compound, the kinds and numbers of atoms are constant
Who postulated that electrons revolve in orbits around the nucleus?
  • Bohr model
  • deBroglie's wave hypothesis
  • Heisenberg's uncertainty principle
  • Dalton
  • Rutherford
If Atom $$1$$ has 19 protons and 22 neutrons and Atom $$2$$ has 20 protons and 22 neutrons, are these isotopes of the same element?
  • There is not enough information to determine this.
  • No, because they have different numbers of protons.
  • No, because they have the same number of neutrons.
  • Yes, because they have different numbers of protons.
  • Yes, because they have the same number of neutrons.
According to Bohr's model of the atom, atoms emit or absorb radiation only at certain wavelengths.Identify why is it so
  • Because the protons and electrons are distributed evenly throughout the atom
  • Because electrons can orbit the nucleus at any radius
  • Because electrons orbit the nucleus only at certain discrete radii
  • Because protons orbit the nucleus only at certain discrete radii
  • Because photons can only have discrete wavelength
 Maximum number of electrons held in the d orbitals is : 
  • $$2$$
  • $$6$$
  • $$8$$
  • $$10$$
  • $$14$$
Which of the following assumptions made by Neils Bohr regarding the hydrogen atom was NOT new and "radical"?
  • Electrons are only stable in certain orbits
  • Atoms only emit electromagnetic radiation when electrons transition to lower energy states
  • The Coulomb force is responsible for keeping the electron in orbit around the positive nucleus
  • An electron in a hydrogen atom can only orbit the nucleus if its angular momentum is some integer multiple of $$h/2 \pi$$
  • All of the above were new and "radical"
According to J.J Thomson's atomic model, negative charges are embedded in:
  • A lump of positive charge
  • A lump of neutral particles
  • A lump of small atoms
  • The nucleus
An atom with atomic number $$20$$ is most likely to combine chemically with the atom whose atomic number is___________.
  • $$11$$
  • $$16$$
  • $$18$$
  • $$10$$
An electron jumps from 3rd orbit to 2nd orbit by gaining the difference of energy of the two levels.
  • True
  • False
Every matter can be seen.
  • True
  • False
The value of first Bohr's radius of a hydrogen atom is ________.
  • $$0.529A^o$$
  • $$5.29 \times 10^{-12}$$
  • $$5.29A^o$$
  • none of these
The change in velocity when electron jumps from the first orbit to the second orbit is__________.
  • half of its original velocity
  • twice of its original velocity
  • one fourth of its original velocity
  • equal to its original velocity
An element has an atomic number $$20$$. How many electrons will be present in $$K, L, M$$ and $$N$$ shells of its atom?
  • $$2, 8, 6, 4$$
  • $$2, 8, 7, 3$$
  • $$3, 7, 7, 3$$
  • $$2, 8, 8, 2$$
An element has atomic number $$17$$ and mass number $$37$$. There are $$17$$ electrons outside the nucleus. Find the number of neutrons in it.
  • $$20$$
  • $$21$$
  • $$17$$
  • $$37$$
The atom of an element has $$10$$ electrons, $$10$$ protons and $$12$$ neutrons. Find the mass number of the element:
  • $$10$$
  • $$12$$
  • $$22$$
  • $$32$$
Multiple Answer Question 
In Bohr's model of the atom:
  • electrons revolve around the nucleus in circular orbits
  • these circular orbits or shells are stationary
  • each shell in associated with a definite amount of energy
  • all shells have equal energy level
What does Bohr's atomic theory explain?
  • About quantum numbers
  • About the shape of sub-levels
  • About nucleus
  • About stationary states
An atom has mass number $$23$$ and atomic number $$11$$. How many protons, electrons and neutrons are present in the atom?
  • $$11, 12, 13$$
  • $$11, 11, 12$$
  • $$11, 11, 13$$
  • $$11, 14, 15$$
A, B, C are three elements with atomic numbers, Z-1, Z, and Z+1 respectively. B is an inert gas.
Identify the group to which A and C belong. 
  • Alkali metal, Alkaline earth metal
  • Halogen, Alkali metal
  • Inert gas, Alkali metal
  • Halogens, Inert gas
The number of nucleons in the isotope of an atom $$_ZX^m$$ are _________.
  • m
  • Z
  • m + Z
  • m - Z
How would fingerprints on a cuvette during a visible spectrometry lab affect the concentration reading?
  • Concentration would be lower, since more light is being reflected and not detected by the spectrometry light sensor.
  • Concentration would be higher since more light is being reflected or absorbed, increasing the absorbance reading.
  • Concentration will stay the same since the fingerprints will only deflect the light slightly and not enough to affect the absorbance measurements.
  • Concentration will be increase since more light is absorbed by the solution, resulting in a decrease in the absorbance measurement.
The atomic number (Z) of an element isIn its ground state, how many electrons are present in the N shell:
  • 13
  • 2
  • 15
  • 3
How are the two atoms $$_{ 92 }^{ 235 }{ P }$$ and $$_{ 92 }^{ 238 }{ P }$$ similar?
(i) They have the same number of protons
(ii) They have the same number of neutrons
(iii) They have the same number of electrons
  • Only (i)
  • Only (i) and (ii)
  • Only (i) and (iii)
  • (i), (ii) and (iii)
Multiple Answer Question.
From Bohr's model radius of the orbit and energy of the hydrogen atom are calculated as :
  • Radius of the 1st orbit is $$0.529 ^oA$$
  • Energy of the 1st orbit is $$-13.6 \ eV$$
  • Energy of the 1st orbit is $$-21.72 \times 10^{-19}J$$
  • Radius of the 1st orbit is $$1.06 ^oA$$
Which of the following statement in relation to the calcium atom is incorrect?
  • $$3s$$ orbital is lower in energy than $$3p$$ orbital
  • $$3p$$ orbital is lower in energy than $$3d$$ orbital
  • $$3s, 3p$$ and $$3d$$ orbitals all have the same energy
  • $$3s, 3p$$ and $$3d$$ orbitals do not have the same energy
The spectral lines remain unaltered under the presence of external magnetic or electric field.
  • True
  • False
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