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Chemistry
11th
grade
Classification of Elements and Periodicity in Properties
20 questions
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- 1. Multiple Choice
Newlands could classify elements only upto
Copper.
Chlorine.
Calcium.
Chromium.
- 2. Multiple Choice
The most significant contribution towards the development of periodic table was made by
Mendeleev.
Avogadro.
Dalton.
Cavendish.
- 3. Multiple Choice
The number of elements known at present is ___.
31
114
63
75
- 4. Multiple Choice
Law of Triads was referred to as ___ relationship.
Lothar Meyer's
Mendeleev's
Newlands's
Dobereiner's
- 5. Multiple Choice
Which of the following statements is incorrect for periodic classification of elements?
The properties of elements are periodic function of their atomic numbers.
Non-metallic elements are less in number than metallic elements.
For transition elements,the 3d-orbital are filled with electrons after 3p-orbitals and before 4s-orbitals
The first ionisation enthalpies of elements generally increase with increase in atomic number as we go long a period.
- 6. Multiple Choice
Which of the following sets has strongest tendency to form anions?
Ga, In, Tl
Na, Mg, Al
N, O, F
V, Cr, Mn
- 7. Multiple Choice
French geologist A.E.B.de Chancourtois arranged the then known elements in order of ___ and made a ___ table of elements to display the periodic recurrence of properties.
increasing atomic weights; cylindrical
increasing atomic weights; rectangular
decreasing atomic weights; cylindrical
decreasing atomic weights; rectangular
- 8. Multiple Choice
According to the periodic Law of elements, the variation in properties of elements is related to their
nuclear masses.
atomic number.
nuclear neutron-proton number ratios.
atomic masses.
- 9. Multiple Choice
Mendeleev classified elements in
increasing order of atomic groups.
eight periods and eight groups.
six periods and eight groups.
eight periods and seven groups
- 10. Multiple Choice
Noble gases were included in Mendeleev's periodic table in the
1st Group.
7th Group.
8th Group.
None of these
- 11. Multiple Choice
In the modern periodic table, which one of the following does not have appropriate positions?
Transition elements
Inert gases
Inner transition elements
Halogens
- 12. Multiple Choice
The old periodic law states that the properties of the elements are a periodic function of their
physical properties.
chemical properties.
atomic weights.
molar mass.
- 13. Multiple Choice
Mendeleev's predictions for the elements Eka-aluminium and Eka-silicon were discovered later as ___ and ___ respectively.
praseodymium; gadolinium
gadolinium; germanium
gallium; germanium
praseodymium; gallium
- 14. Multiple Choice
Pick out the correct statement regarding Law of Octaves.
John Alexander Newlands propounded the Law of Octaves in 1855.
He arranged the elements in decreasing order of their atomic weights and noted that every tenth element had properties similar to the first element.
Newlands's Law of Octaves seemed to be true only for elements up to calcium.
Mg and K show resemblance in properties.
- 15. Multiple Choice
The atoms of elements belonging to the same group of periodic table have the same
number of protons.
number of electrons.
number of neutrons.
number of electrons in the outermost shell.
- 16. Multiple Choice
The elements with atomic numbers 2, 10, 18, 36, 54 and 86 are all
halogens.
nobel gases.
nobel metals.
light metals.
- 17. Multiple Choice
The number of elements in each of the inner transition series is ___.
2
8
10
14
- 18. Multiple Choice
Pick out the correct statement regarding Mendeleev's periodic table.
Mendeleev predicted periodicity based on the similarities of physical properties of the elements only.
All the elements fit the classification with increasing atomic weight.
The elements in a group are not similar in their properties.
Mendeleev predicted the existence of Eka-Aluminium and Eka-Silicon.
- 19. Multiple Choice
The atomic mass of Sr as predicted according to the Dobereiner's law of triads in the triad Ca(Z=40), Sr, Ba(Z=137)is ___.
80
88
100
85
- 20. Multiple Choice
The noble gases are unreactive because
they react with sodium.
they have a full outer shell of electrons.
they have a half outer shell of neutrons.
they have a half outer shell of neutrons.
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