Ncert Solutions Chemistry Class 11th
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Ionic radii vary in
(i) Inverse proportion to the effective nuclear charge.
(ii) Inverse proportion to the square of effective nuclear charge.
(iii) Direct proportion to the screening effect
(iv) Direct proportion to the square of screening effect.
Ionic radii vary in
(i) Inverse proportion to the effective nuclear charge.
(ii) Inverse proportion to the square of effective nuclear charge.
(iii) Direct proportion to the screening effect
(iv) Direct proportion to the square of screening effect.
This is a Multiple Choice Questions as classified in NCERT Exemplar
Option (i)& (iii)
Ionic radii decreases with the increase of the effective nuclear charge and increases with the increase of shielding effect or e- - e - repulsion as it outweighs the effective nuclear charge effect.
Upvote 
Which of the following have no unit?
(i) Electronegativity
(ii) Electron gain enthalpy
(iii) Ionisation enthalpy
(iv) Metallic character
Which of the following have no unit?
(i) Electronegativity
(ii) Electron gain enthalpy
(iii) Ionisation enthalpy
(iv) Metallic character
This is a Multiple Choice Questions as classified in NCERT Exemplar
Option (i)& (iv)
Both electronegativity and metallic character do not possess units as they both are qualitative properties not a quantitative property.
Upvote In which of the following options order of arrangement does not agree with the variation of property indicated against it?
(i) Al3+ < Mg2+ < Na+ < F– (increasing ionic size)
(ii) B < C < N < O (increasing first ionisation enthalpy)
(iii) I < Br < Cl < F (increasing electron gain enthalpy)
(iv) Li < Na < K < Rb (increasing metallic radius)
In which of the following options order of arrangement does not agree with the variation of property indicated against it?
(i) Al3+ < Mg2+ < Na+ < F– (increasing ionic size)
(ii) B < C < N < O (increasing first ionisation enthalpy)
(iii) I < Br < Cl < F (increasing electron gain enthalpy)
(iv) Li < Na < K < Rb (increasing metallic radius)
This is a Multiple Choice Questions as classified in NCERT Exemplar
Option (ii)& (iii)
The ionization enthalpy of N is higher than that of F because it possess half filled orbital which provide it extra stability due to symmetry.
As the atomic size of F is much smaller thus its electron gain enth
Upvote Which of the following sets contain only isoelectronic ions?
(i) Zn2+, Ca2+, Ga3+, Al3+
(ii) K+ , Ca2+, Sc3+, Cl –
(iii) P3–, S2–, Cl– , K+
(iv) Ti 4+, Ar, Cr3+, V5+
Which of the following sets contain only isoelectronic ions?
(i) Zn2+, Ca2+, Ga3+, Al3+
(ii) K+ , Ca2+, Sc3+, Cl –
(iii) P3–, S2–, Cl– , K+
(iv) Ti 4+, Ar, Cr3+, V5+
This is a Multiple Choice Questions as classified in NCERT Exemplar
option (ii)& (iii)
Isoelectronic species/ions are those species that possess the same number of electrons.
Upvote Which of the following statements are correct?
(i) Helium has the highest first ionisation enthalpy in the periodic table.
(ii) Chlorine has less negative electron gain enthalpy than fluorine.
(iii) Mercury and bromine are liquids at room temperature.
(iv) In any period, atomic radius of alkali metal is the highest.
Which of the following statements are correct?
(i) Helium has the highest first ionisation enthalpy in the periodic table.
(ii) Chlorine has less negative electron gain enthalpy than fluorine.
(iii) Mercury and bromine are liquids at room temperature.
(iv) In any period, atomic radius of alkali metal is the highest.
This is a Multiple Choice Questions as classified in NCERT Exemplar
Option (i), (iii)& (iv)
He with 1s2 electronic configuration has the highest electron gain enthalpy in the periodic table. In any period the alkali metals have the lowest effective nuclear charge in that particular period for which it
Upvote Which of the following elements will gain one electron more readily in comparison to other elements of their group?
(i) S (g)
(ii) Na (g)
(iii) O (g)
(iv) Cl (g)
Which of the following elements will gain one electron more readily in comparison to other elements of their group?
(i) S (g)
(ii) Na (g)
(iii) O (g)
(iv) Cl (g)
This is a Multiple Choice Questions as classified in NCERT Exemplar
Option (i)& (iv)
Both S and Cl have the higher tendency to gain electrons in order to attain stable the nearest noble gas configuration i.e. of Argon.
Upvote Which of the following sequences contain atomic numbers of only representative elements?
(i) 3, 33, 53, 87
(ii) 2, 10, 22, 36
(iii) 7, 17, 25, 37, 48
(iv) 9, 35, 51, 88
Which of the following sequences contain atomic numbers of only representative elements?
(i) 3, 33, 53, 87
(ii) 2, 10, 22, 36
(iii) 7, 17, 25, 37, 48
(iv) 9, 35, 51, 88
This is a Multiple Choice Questions as classified in NCERT Exemplar
Option (i)& (iv)
The s-block elements and p-block elements together are called representative elements.
Upvote Those elements impart colour to the flame on heating in it, the atoms of which require low energy for the ionisation (i.e., absorb energy in the visible region of spectrum). The elements of which of the following groups will impart colour to the flame?
(i) 2
(ii) 13
(iii) 1
(iv) 17
Those elements impart colour to the flame on heating in it, the atoms of which require low energy for the ionisation (i.e., absorb energy in the visible region of spectrum). The elements of which of the following groups will impart colour to the flame?
(i) 2
(ii) 13
(iii) 1
(iv) 17
This is a Multiple Choice Questions as classified in NCERT Exemplar
Option (i) & (iii)
Alkali metals and alkaline earth metals have low ionization enthalpy.
Upvote In the following questions two or more options may be correct.
Which of the following elements can show covalency greater than 4?
(i) Be
(ii) P
(iii) S
(iv) B
In the following questions two or more options may be correct.
Which of the following elements can show covalency greater than 4?
(i) Be
(ii) P
(iii) S
(iv) B
This is a Multiple Choice Questions as classified in NCERT Exemplar
Option (ii) & (iii)
Both P and S have vacant d-orbital for which they execute extended covalency.
Upvote Electronic configurations of four elements A, B, C and D are given below:
(A) 1s2 2s2 2p6 (B) 1s2 2s2 2p4
(C) 1s2 2s2 2p6 3s1 (D) 1s2 2s2 2p5
Which of the following is the correct order of increasing tendency to gain electron :
(i) A < C < B < D
(ii) A < B < C < D
(iii) D < B < C < A
(iv) D < A < B < C
Electronic configurations of four elements A, B, C and D are given below:
(A) 1s2 2s2 2p6 (B) 1s2 2s2 2p4
(C) 1s2 2s2 2p6 3s1 (D) 1s2 2s2 2p5
Which of the following is the correct order of increasing tendency to gain electron :
(i) A < C < B < D
(ii) A < B < C < D
(iii) D < B < C < A
(iv) D < A < B < C
This is a Multiple Choice Questions as classified in NCERT Exemplar
Option (i)
The electron gain enthalpy of 2p orbital is higher than that of the 3s orbital
Upvote