Practice free Classification of elements and Periodicity in properties (Chemistry) NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
The First ionisation enthalpies of Na,Mg,Al and Si are in the order
The ionisation potential of Mg is higher than Na as well as Al due to presence of stable configuration i.e ns2
Which of the following is smallest in size?
decreasing order of size (Na+ smallest size)
N3- > O2- > F- > Na+
For electron affinity of halogens, which of the following is correct?
The electron affinity of F is less than Cl. Hence electron affinity of F is greater than I is the correct option.
Which one of the elements has highest ionisation energy?
Due to presence of stable configuration,
[Ne]3s23p3 has highest energy.
Which of the following has the highest electron affinity?
O>Na>O->F-
F negative ion is having 8 electrons so, it doesn't need any further electron.
o- has 7 electron , but presence of -ve charge will reduces E.A
Which of has the largest size?
Li+(aq) has largest size due to high hydration
The screening effect of d-electrons is :
Size of the orbital order are s < p < d < f, as the size of the orbital decreases screening effect increases
Values of electronegativity like 3.0, 2.8, 2.5 are related to :-
Maximum IP Noble gas
Max.EA halogens
EN of CI = 3
EN of Br = 2.8
EN of I = 2.5
According to Gallis, Hanny and Smith 50% ionic character and 50% covalent character in a molecule is related to :-
According to Gallis EN = 1.7
According to Henry and Smith EN = 2.1
In scandium series, maximum distance between neutrons containing site and valence shell is of :-
in 3d series, Sc has maximum radius.
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