the electronegativity of the following elements increases in the order
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Chemistry MCQs for NEET — Practice Questions with Answers
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What are the combining ratios of elements in group l with elements in group VII of the periodic table ?
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Explanation
All the elements in group l have one electron in their valence shells. Transfer of one electron from the valence shell of elements in group l to the valence shall of elements in group VII results in :
(i) Octet formation for both.
(ii) Formation of ions having charge of +1 and -1 respectively.
The combining ratio 1 : 1. This ratio of ions results in a neutral aggregate with the formula AB, where A stands for the cations of the group l elements , and B stands for the anions of group VII.
The First ionisation enthalpies of Na,Mg,Al and Si are in the order
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Explanation
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?
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Explanation
decreasing order of size (Na+ smallest size)
N3- > O2- > F- > Na+
For electron affinity of halogens, which of the following is correct?
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Explanation
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?
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Explanation
Due to presence of stable configuration,
[Ne]3s23p3 has highest energy.
Which of the following has the highest electron affinity?
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Explanation
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?
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Explanation
Li+(aq) has largest size due to high hydration
The screening effect of d-electrons is :
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Explanation
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 :-
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Explanation
Maximum IP Noble gas
Max.EA halogens
EN of CI = 3
EN of Br = 2.8
EN of I = 2.5
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