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Published on: 26/08/2019
Classification of Elements and Periodicity in Properties
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Questions + Answers key
Take MCQ Chemistry Test
1.
Write the number designation of a group that has 2 electrons beyond a noble gas configuration.
2.
Which properties of the elements depend on the electronic configuration of the atoms and which do not?
3.
Why were the names eka-aluminium and eka-silicon given to gallium and germanium by Mendeleev?
4.
X, Y, and Z are three members of a Dobereiner's triad. If the atomic mass of X is 7 and that of Z is 39, what is the atomic mass of Y?
5.
What is the basic theme of organisation in the periodic table?
6.
Among the following elements, which has the least electron affinity?
Phosphorous
Oxygen
Sulphur
Nitrogen
7.
What is the electronic configuration of the elements of group 14?
ns2 np4
ns2 np6
ns2 np2
ns2
8.
Which of the following is arranged in order of increasing radius?
K+ (aq) < Na + (aq) < Li+ (aq)
K+ (aq) > Na + (aq) > Zn2+ (aq)
K+ (aq) > Li+ (aq) > Na + (aq)
Li+ (aq) < Na + (aq) < K+ (aq)
9.
Which of the following oxides is neutral?
Sn02
CO
Al2O3
Na2O
10.
The highest ionization energy is exhibited by _____.
halogens
alkaline earth metals
transition metals
noble gases
1.
The number designation of a group that has 2 electrons beyond a noble gas configuration will be 2 which means it will belong to group 2 of the periodic table.
2.
Chemical and many physical properties of the elements depend on the electronic configuration of the atoms, whereas the nuclear properties do not.
3.
These names were given to gallium and germanium by Mendeleev because he thought that these elements will have similar properties as that of aluminium and silicon, respectively.
4.
Atomic mass of Y \(=\frac{\text{atomic mass of X+atomic mass of Z}}{2}\)
\(=\frac{7+39}{2}=\frac{46}{2}=23\)
5.
The basic theme of organisation in the periodic table is to simplify and systematise the study of physical and chemical properties of all the elements and their innumerable compounds.
6.
(d)
Nitrogen
7.
(c)
ns2 np2
8.
(c)
K+ (aq) > Li+ (aq) > Na + (aq)
9.
(b)
CO
10.
(b)
alkaline earth metals
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