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Chemistry - 9 Chapter - 4
Periodicity of Elements and Periodic Table
Test - 21
1.
Lanthanides and Actinides are member of _______ block.
a) d
b) s
c) p
d) f
2.
Outer transition elements are contained in ___________ block.
a) d
b) p
c) f
d) s
3.
Outer transition elements are contained in d-block.
a) True
b) False
4.
The element having 3 shells and 6 electrons in outer most shell belongs to which block of the periodic table?
a) S-block
b) P-block
c) D-block
d) F-block
5.
What are representative elements or normal elements?
a) Elements of s and p block
b) Elements of f and p block
c) Elements of s and f block
d) Elements of d and p block
6.
What is a block? Short..Answer............................................... A block is a set of ______items or elements in a periodic table.
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7.
Why 3A to 7A are called p-block? Short..Answer............................................... Because ______electrons of the elements gradually fill p-orbital.
a) Negative
b) Valence
8.
Halogens are found in sea water in the form of their _____ ion.
a) Positive
b) Halide
c) Negtive
d) Neutral
9.
Reactivity of halogens gradually increases down the group.
a) True
b) False
10.
Why Mendeleef's periodic law was modified?
a) Position of all elements was not as per their atomic mass
b) Isotopes could not be fitted at different positions
c) Correct electronic configuration was not available
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