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Chemistry - 9 Chapter - 4
Periodicity of Elements and Periodic Table
Test - 23
1.
What do you understand by amphoteric oxides?
a) The element which possesses only metallic characteristics i.e. oxides of aluminium (Al
2
O
3
)
b) The element which possesses both metallic and non-metallic characteristics i.e. oxides of aluminium (Al
2
O
3
)
c) The element which possesses onlynon-metallic characteristics i.e. oxides of aluminium (Al
2
O
3
)
d) The element which possesses both metallic and non-metallic characteristics i.e. oxides of aluminium (Al
4
O
2
)
2.
What is a base? Short..Answer..........................................................
a) D. It can form a covalent bond with an alkali.
b) C. It can form a covalent bond with an acid.
c) E. B and C are correct
d) B. Base is a chemical compound that reacts with acids to form salts.
e) A. Base is an element that reacts with acids to form salts.
3.
What is meant by amphoteric?
a) Amphoteric means able to react chemically with an acid or a base.
b) Amphoteric means not able to react chemically as either an acid or a base.ms
c) Amphoteric means not able to react chemically with an acid or a base.
4.
1s^1 configuration means sub-shell having only one electron.
a) True
b) False
5.
3s^2, 3p^2 in outer most shell means ______ electrons in outer most shell.
a) None
b) 12
c) 6
d) 4
6.
4sAl
2
O
3
means five electron in ________ shell
a) L
b) N
c) K
d) M
7.
8s
2
valence shall electronic configuration means?
a) 2 electrons in 7th shell
b) 8 electrons in 2nd shell
c) 2 electrons in 6th shell
d) 2 electrons in 8th shell
8.
All transition elements are metals and they have same characteristics.
a) False
b) True
9.
An element with 8s
2
valence shall electronic configuration will have a total of ______electrons?
a) 92
b) 120
c) 110
d) 118
10.
Colour of the hair of people differs due to the presence of ______?
a) None is correct
b) Transition elements
c) Inner transition elements
d) Outer transition elements
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