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Class 10 Science
Periodic Classification Of Elements Chapter 5
Quiz 1
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How many triads could Dobereiner identify from the elements known at that time?
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3
0%
5
0%
4
0%
2
Newlands classification of elements did not include _______ .
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Metalloids
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Metals
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Noble gases
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Non-metals
Dobereiner's triad arranged the elements with similar properties into:
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Periods
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Groups
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Both period and group
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None of these
X (atomic mass = 37), Y (atomic mass = 81), and Z are three members of Dobereiner's triads. Atomic mass of Z=?
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59
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125
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130
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None of the above
Mendeleev's classification was based on _______ .
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Increasing atomic mass
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Decreasing atomic number
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Increasing atomic number
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Decreasing atomic mass
The Law of Octaves was applicable only upto element ________.
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Sodium
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Calcium
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Zinc
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Copper
Which of the following triads is a Dobereiner's Triad?
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N, P, As
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S, O, H
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Na, Ra, Al
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Li, Na, K
How many elements did Mendeleev's periodic table contain?
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63
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17
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58
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118
Choose the incorrect statement in view of Mendeleev's Periodic Table.
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Position of hydrogen was clear.
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Atomic masses were not strictly followed.
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Isotopes of elements were placed at same position.
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Elements were arranged in order of their atomic masses
How many elements were known when Mendeleev started his work on his periodic table?
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63
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55
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69
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45
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