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

Neutrons are obtained by:
  • Bombardment of Ra with $$\beta$$ - particles
  • Bombardment of Be with $$\alpha$$ -particles
  • Radioactive disintegration of uranium
  • None of these
When a mixture of aluminium powder and iron $$(III)$$ oxide is ignited, it produces molten iron and aluminium oxide. In an experiment, $$5.4\ g$$ of aluminium was mixed with $$18.5\ g$$ of iron $$(III)$$ oxide. At the end of the reaction, the mixture contained $$11.2\ g$$ of iron, $$10.2\ g$$ of aluminium of unreacted iron $$(III)$$ oxide. No aluminium was left. What is the mass of the iron $$(III)$$ oxide left?
  • $$2.5\ g$$
  • $$7.3\ g$$
  • $$8.3\ g$$
  • $$2.9\ g$$
The commonly used pain reliever, aspirin, has the molecular formula $$C_9H_8O_4.$$ If a sample of aspirin contains $$0.968\ g $$ of carbon, what is the mass of hydrogen in the sample?
  • $$0.717\ g$$
  • $$0.0717\ g$$
  • $$8.000\ g$$
  • $$0.645\ g$$
Which statement about a $$3$$p orbital is correct?
  • It can hold a maximum of $$6$$ electrons
  • It has the highest energy of the orbitals with principal quantum number $$3$$
  • It is at a higher energy level than a $$3$$s orbital but has the same shape
  • It is occupied by one electron in an isolated phosphorous atom
Which of the following is not a fundamental particle?
  • Electron
  • Proton
  • Neutron
  • $$X-$$rays
In the sixth period of the extended from of periodic table, the orbitals are filled as:
  • 6s, 5f, 6d, 6p
  • 5s, 5p, 5d, 6p
  • 6s, 6p, 6d, 6f
  • 6s, 4f, 5d, 6p
Which of the following quantity for an electron revolving round the $$H-nucleus$$ is independent to the mass of electron ?
  • distance from nucleus
  • $$K.E.$$
  • $$P.E.$$
  • speed
The penultimate and outermost orbit of an element contains $$10$$ and $$2$$ electrons respectively. If the outermost orbit is fourth orbit, the atomic number of the element should be
  • $$12$$
  • $$22$$
  • $$32$$
  • $$40$$
The effective atomic number of cobalt in the complex $$[Co(NH_3)_6]^{3+}$$ is:
  • $$36$$
  • $$33$$
  • $$24$$
  • $$30$$
$$K$$ and $$L$$ shell of an element are completely filled and there are $$16$$ electron in $$M-$$ shell and $$2-$$ electrons in $$N-$$ shell. The atomic number of the element is
  • $$18$$
  • $$28$$
  • $$22$$
  • $$26$$
Wireless mouse works on which technology?
  • IR
  • Radio frequency
  • X Rays
  • Gamma Rays
How many unpaired electrons are present in ground state of chromium $$(Z=24)$$?
  • $$1$$
  • $$5$$
  • $$6$$
  • $$0$$
In the sixth period, the orbitals are filled as : 
  • 6s 5f 6d 6p
  • 6s 4f 5d 6p
  • 5s 5p 5d 6p
  • 6s 6p 6d 6f
The ratio of the radii of the first three Bohr orbits is:
  • $$1:5:33$$
  • $$1:2:3$$
  • $$1:4:9$$
  • $$1:8:27$$
The radius of the first Bohr orbit of hydrogen atom is $$r$$. The radius of the $$3^{rd}$$orbit would be:
  • $$3r$$
  • $$9r$$
  • $$27r$$
  • $$none\ of\ these$$
An element X belongs to fourth period and fifteenth group of the periodic table. Which one of the following is true regarding the outer electronic configuration of X? It has: 
  • partially filled d-orbitals and completely filled s-orbital
  • completely filled s-orbital and completely filled p-orbitals
  • completely filled s- orbital and half filled p-orbitals
  • half filled d-orbitals and completely filled s-orbital
  • completely filled s-, p- and d-orbitals
The $$_{88}Ra^{226}$$ is:
  • n-mesons
  • u-mesons
  • Radioactive
  • Non-radioactive
The expression for Bohr's radius of an atom is 
  • $$r = \dfrac{n^2h^2}{4\pi^2me^4z^2}$$
  • $$r = \dfrac{n^2h^2}{4\pi^2me^2z}$$
  • $$r = \dfrac{n^2h^2}{4\pi^2me^2z^2}$$
  • $$r = \dfrac{n^2h^2}{4\pi^2m^2e^2z^2}$$
Nuclear reactivity of $$Na$$ and $$Na^+$$ is same because both have:
  • Same electron and proton
  • Same proton and same neutron
  • Different electron and proton
  • Different proton and neutron
The $$\alpha$$ -particle is identical with:
  • Helium nucleus
  • Hydrogen nucleus
  • Electron
  • Proton
$$_6C^{14}$$ is formed from $$_7N^{14}$$ in the upper atmosphere by the action of the fundamental particle:
  • Positron
  • Neutron
  • Electron
  • Proton
An element $$_{96}X^{227}$$ emits $$4\alpha$$ and $$5\beta$$ particles to form new element Y. Then atomic number and mass number of Y are:
  • 93; 211
  • 211; 93
  • 212; 88
  • 88; 211
Which of the following is radioactive element?
  • Sulphur
  • Polonium
  • Tellurium
  • Selenium
Alpha particles are ...... times heavier (approximately) than neutrons.
  • 2
  • 4
  • 3
  • 5
Radioactivity is due to:
  • Stable electronic configuration
  • Unstable electronic configuration
  • Stable nucleus
  • Unstable nucleus
The appreciable radioactivity of uranium minerals is mainly due to:
  • An uranium isotope of mass number 235
  • A thorium isotope of mass number 232
  • Actinium
  • Radium
A radium $$_{88}Ra^{224}$$ isotope, on emission of an $$\alpha$$ -particle gives rise to a new element whose mass number and atomic number will be:
  • 220 and 86
  • 225 and 87
  • 228 and 88
  • 224 and 86
If uranium (mass no. 238 and atomic no. 92) emits $$\alpha$$ -particle, the product has mass number and atomic number:
  • 234, 90
  • 236, 92
  • 238, 90
  • 236, 90
The maximum sum of the number of neutrons and protons in an isotope of hydrogen is:
  • 4
  • 5
  • 6
  • 3
The amount of energy which is released due to addition of extra electron to the outermost orbit of gaseous atom is called 
  • Electron capacity
  • Electron affinity
  • ionisation potential
  • Electronegativity
Which of the following property displays progressive increase down a group in the Bohr's periodic table
  • Electronegativity
  • Electron affinity
  • Ionization potential
  • Size of the atom
The number of elements in the $$5^{th}$$ period of the periodic table are
  • $$8$$
  • $$10$$
  • $$18$$
  • $$32$$
Which property is different for neutral atoms of the two isotopes of the same element?
  • Number of protons
  • Atomic number
  • Number of neutrons
  • None of these
The symbol of an isotope is $$_{32}  X^{65}$$, this reveals that:
  • Its atomic number is 32 and atomic weight is 65
  • Its atomic number is 65
  • It has 65 electrons
  • It has 32 neutrons
Which character is different of the two isotopes of an element?
  • Atomic mass
  • Atomic number
  • Number of electrons
  • Number of protons
The atomic number of bromine is 35 and its atomic weight is 79. Two isotopes of bromine are present in equal amounts. Which of the following statements represents the correct number of neutrons?
  • First isotope - 34, Second isotope - 36
  • First isotope - 44, Second isotope - 46
  • First isotope - 45, Second isotope - 47
  • First isotope - 79, Second isotope - 81
Atomic weight of the isotope of hydrogen which contains 2 neutrons is the nucleus would be:
  • 2
  • 3
  • 1
  • 4
An element in +3 oxidation state has the electronic configuration $$ (Ar)3d^3 $$, Its atomic number is 
  • 24
  • 23
  • 22
  • 21
Difference in $$_{17}Cl^{35}$$ and $$_{17}Cl^{37}$$ is of:
  • Atomic number
  • Number of protons
  • Number of neutrons
  • Number of electrons
Which of the following properties are different for neutral atoms of isotopes of the same element?
  • Mass
  • Atomic number
  • General chemical reactions
  • Number of electrons
Isotopes are those which contain:
  • Same number of neutrons
  • Same physical properties
  • Same chemical properties
  • Different atomic mass
The elements with a atomic number 26 is
  • A non-metal
  • Krypton
  • Iron
  • Manganese
Out of all the known elements the number of transitional elements is  
  • 80
  • 61
  • 43
  • 38
In transition elements, the orbitals partially filled by electrons are 
  • s- orbitals
  • p- orbitals
  • d- orbitals
  • f- orbitals
All those elements belong to f- block whose atomic number are 
  • 58 to 71
  • 90 to 103
  • Both (A) and (B)
  • None
Those elements whose two outermost orbitals are incompletely filled with electrons are 
  • p - block elements
  • s - block elements
  • transitional elements
  • Both s and p - block elements
How are isotopes of the same element similar?
  • They have the same particles in the nucleus
  • They have the same number of neutrons
  • They are equally abundant in nature
  • They have the same number of protons
  • They have the same mass
Which of the following in figure do not represent Bohr’s model of an atom correctly?

1790458_496e454bf7f9477e89e316e17696b390.png
  • (i) and (ii)
  • (ii) and (iii)
  • (ii) and (iv)
  • (i) and (iv)
Tick the appropriate answer.
Which one of the following scientists put forward the theory regarding the extra-nuclear structure of the atom ?
  • James Chadwick
  • John Dalton
  • Rutherford
  • Niels Bohr
Identify the pairs which are not isotopes?
  • $$^{12}_{6}X\ ^{13}_{6}Y$$
  • $$^{35}_{17}X\ ^{37}_{17}Y$$
  • $$^{34}_{6}X\ ^{14}_{7}Y$$
  • $$^{8}_{4}X\ ^{8}_{2}Y$$
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