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Chemistry - 9 Chapter - 4
Periodicity of Elements and Periodic Table
Test - 11
1.
In 1894, argon gas was discovered by _______?
a) Raleigh and Ramsay
b) Ramsay
c) Mendeleef
d) Raleigh
2.
Modified periodic law is "properties of elements are a periodic function of __________?
a) Their physical properties
b) Their atomic numbers
c) Their atomic masses
d) Their chemical properties
3.
Some compounds of xenon gas were prepared in ___________.
a) 1862
b) 1869
c) 1962
d) 1894
4.
What problems were solved by modified periodic table ?
a) 2. Positions of Ar (atomic mass 40) and K (atomic mass 39) were adjusted as 18 and 19
b) 3. Different isotopes of one element fitted in one place
c) 4. Answer two and three are correct
5.
Why certain gases were named as "inert gases"?
Short..Answer......................................................
Because they do not react chemically with other elements and none of their ______could be prepared.
a) Mixtures
b) Compounds
6.
Why density of nitrogen obtained from air is 0.5% more than obtained by chemical action?
a) It is not heavy
b) Because another heavier gas argon, got mixed with nitrogen
c) Because another lighter gas argon, got mixed with nitrogen.
d) No answer is correct
7.
Why the name of "inert gases" was changed to noble gases?
a) Compounds of argon and xenon were prepared
b) Because they were unique gases
c) Because some compounds of xenon were prepared
d) Compounds of all gases were prepared
8.
The noble gas which reacts to give a few compounds is:
a) Krypton
b) Neon
c) Argon
d) Xenon
9.
All noble gases belong to ______group.
a) one
b) three
c) Zero
d) two
10.
In advertisement lights _____ gas is used.
a) Neon
b) helium
c) xenon
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