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Chemistry - 9 Chapter - 4
Periodicity of Elements and Periodic Table
Test - 9
1.
Newland was an _______ chemist.
a) German
b) Italian
c) Indian
d) English
2.
Newlands work could not get much attention because _________ were present in his table.
a) No formulas
b) No sceintific proofs
c) So many mistakes
d) No blank spaces for undiscovered elements
3.
Up to 1860 the number of elements discovered rose to about_________.
a) 66
b) 60
c) 67
d) 65
4.
What were defects in Newland's Law of octaves? Short..Answer...........................................................
No blank spaces for undiscovered elements were reserved and ________discovered later could not be adjusted.
a) isotopes
b) noble gases
5.
Cannizzaro found out correct atomic masses of elements in ______?
a) 1960
b) 1680
c) 1860
d) 1806
6.
Cannizzaro was an ______ chemist?
a) Indian
b) Italian
c) German
d) American
7.
Law of "Octaves" means arranging elements according to atomic masses in ascending order in such a way that _______?
a) Fifteenth element comes under eighth
b) Two answers are corret
c) Eighth element comes under the first
d) Sevent element comes under first one
8.
Law of "octaves" was formulated by ________ ?
a) Newland
b) Dobereineri
c) Lother Meyer
d) Mendeleef
9.
Define periodicity? ( Click the wrong answer )
a) In element grouping elements with similar properties but different atomic numbers repeated after regular intervals
b) Periodicity means similar things happening after regular intervals.
c) In element grouping elements with different properties but different atomic numbers repeated after regular intervals
10.
Periodicity means?
a) None is correct
b) Some time
c) Some length
d) Something happening after regular intervals
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