The electron gain enthalpies of halogens in kJ mol-1 are as given below.

F =-332, Cl =-349, Br =-234, I =-295.

The least negative value for F as compared to that of Cl is due to:

(A) Strong electron-electron repulsions in the compact 2p-subshell of F.

(B) Weak electron-electron repulsions in the bigger 3p-subshell of Cl.

(C) Smaller electronegativity value of F than Cl.

(D) (A) & (B) both

Concept Questions :-

Electron Affinity (EA)
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

Which of the following statements are correct ?

(i) Generally the radius trend and the ionization energy trend across a period are exact opposites.

(ii) Electron affinity values of elements may be exothermic (negative) or endothermic (positive)

(iii) The first ionization energy of sulphur is higher than that of phosphorus ?

(iv) $T{e}^{2-}>{I}^{-}>C{s}^{+}>B{a}^{2+}$ represents the correct decreasing order of ionic radii.

(A) (i), (iii) and (iv)                          (B) (ii), (iii) and (iv)

(C) (i), (ii) and (iv)                           (C) (i), (ii) and (iii)

Concept Questions :-

Atomic Size
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Difficulty Level:

Which of the following statements is not correct?

(A) The first ionization energies (in KJ $mo{l}^{-1}$) of carbon, silicon, germanium, tin, and lead are 1086, 786, 761, 708 and 715 respectively.

(B) Down the group, electronegativity decreases from B to Tl in boron family.

(C) Among oxides of the elements of carbon family, CO is neutral, GeO is acidic and SnO is amphoteric.

(D) The 4f- and 5f- inner transition elements are placed separately at the bottom of the periodic table to maintain its structure.

Concept Questions :-

Ionization Energy (IE)
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Difficulty Level:

The correct order of acidic strength is :

(A) $C{l}_{2}{O}_{7}>S{O}_{2}>{P}_{4}{O}_{10}$                   (B) $C{O}_{2}>{N}_{2}{O}_{5}>S{O}_{3}$

(C) $N{a}_{2}O>MgO>A{l}_{2}{O}_{3}$                   (D) ${K}_{2}O>CaO>MgO$

Concept Questions :-

Nature of Compound
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Difficulty Level:

Which of the following orders is correct?

(A) F>N>C>Si>Ga -non-metallic character.

(B) F>Cl>O>N - oxidising property.

(C) C<Si>P>N - electron affinity value.

(D) All of these.

Concept Questions :-

Nature of Compound
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Difficulty Level:

If the same element is forming oxides in different oxidation states then :

(A) that oxides will be neutral in nature in which element will be in its highest oxidation state.

(B) that oxide will be highest acidic in nature in which element will be in this highest oxidation state.

(C) that oxide will be amphoteric in nature in which element will be in its highest oxidation state.

(D) that oxide will be highly basic in nature in which element will be in its highest oxidation state.

Concept Questions :-

Nature of Compound
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Difficulty Level:

Assertion : The ${5}^{th}$ period of periodic table contains 18 elements and not 32.

Reason : n = 5, –1 = 0, 1, 2, 3. The order in which the energy of available orbits 4d, 5s and 5p increases is 5s < 4d < 5p and the total number of orbitals available are 9 and thus 18 electrons can be accommodated.

1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
3. If the assertion is true but the reason is false
4. If both the assertion and reason are false

Concept Questions :-

History

Difficulty Level:

Assertion : :The 4f- and 5f- inner transition series of elements are placed separately at
the bottom of the periodic table.

Reason : (i) This prevents the undue expansion of the periodic table i.e., maintains its structure.
(ii) This preserve the principle of classification by keeping elements with similar properties in a single column.

1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
3. If the assertion is true but the reason is false
4. If both the assertion and reason are false

Concept Questions :-

History

Difficulty Level:

Assertion : Manganese (atomic number 25 ) has a less favourable electron affinity than its neighbours on either side because.

Reason : The Manganese has stable, ${\left[Ar\right]}^{18}3{d}^{5}4{s}^{2}$ electrons configuration.

1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
3. If the assertion is true but the reason is false
4. If both the assertion and reason are false

Concept Questions :-

Ionization Energy (IE)
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Difficulty Level:

Assertion : Fluorine forms only one oxoacid, HOF because,

Reason : Fluorine has small size and high electronegativity.

1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
3. If the assertion is true but the reason is false
4. If both the assertion and reason are false

Concept Questions :-

Electronegativity