Periodic Table & Periodicity

The electron affinity value are negative for
A. \(\mathrm{Be} \rightarrow \mathrm{Be}^{-}\)
B. \(\mathrm{N} \rightarrow \mathrm{N}^{-}\)
C. \(\mathrm{O} \rightarrow \mathrm{O}^{2-}\)
D. \(\mathrm{Na} \rightarrow \mathrm{Na}^{-}\)
E. $$\math...

Given below are two statements:
Statement I: In group 13, the stability of +1 oxidation state increases down the group.
Statement II : The atomic size of gallium is greater than that of aluminium.
In the light of the above statements, choos...

The statement(s) that are correct about the species \(\mathrm{O}^{2-}, \mathrm{F}^{-}, \mathrm{Na}^{+}\) and \(\mathrm{Mg}^{2+}\).
(A) All are isoelectronic
(B) All have the same nuclear charge
(C) \(\mathrm{O}^{2-}\) has the largest ionic ...

Given below are two statements :
Statement I : The metallic radius of \(\mathrm{Na}\) is \(1.86 \mathrm{~A}^{\circ}\) and the ionic radius of \(\mathrm{Na}^{+}\) is lesser than \(1.86 \mathrm{~A}^{\circ}\)
Statement II : Ions are always sma...

Number of elements from the following that CANNOT form compounds with valencies which match with their respective group valencies is ________. B, C, N, S, O, F, P, Al, Si

The correct order of first ionization enthalpy values of the following elements is :
(A) O
(B) N
(C) Be
(D) F
(E) B
Choose the correct answer from the options given below :

The correct order of the first ionization enthalpy is

Given below are two statements :
Statement I : The correct order of first ionization enthalpy values of \(\mathrm{Li}, \mathrm{Na}, \mathrm{F}\) and \(\mathrm{Cl}\) is \(\mathrm{Na}<\mathrm{Li}<\mathrm{Cl}<\mathrm{F}\).
Statement II : The c...

The correct sequence of electron gain enthalpy of the elements listed below is
A. Ar
B. Br
C. F
D. S
Choose the most appropriate from the options given below:

Consider the following elements.

Which of the following is/are true about \(\mathrm{A}^{\prime}, \mathrm{B}^{\prime}, \mathrm{C}^{\prime}\) and \(\mathrm{D}^{\prime}\) ?
A. Order of atomic radii: $$\mathrm{B}^{\prime}<\mathrm{A}^{\prime}<\...

If IUPAC name of an element is "Unununnium" then the element belongs to nth group of Periodic table. The value of n is ________.

Match List I with List II.

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Given below are two statements:
Statement - I: Along the period, the chemical reactivity of the elements gradually increases from group 1 to group 18 .
Statement - II: The nature of oxides formed by group 1 elements is basic while that of g...

Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R:
Assertion A: \(\mathrm{H}_2 \mathrm{Te}\) is more acidic than \(\mathrm{H}_2 \mathrm{~S}\).
Reason R: Bond dissociation enthalpy of $$\mat...

Given below are two statements :
Statement I : The electronegativity of group 14 elements from \(\mathrm{Si}\) to \(\mathrm{Pb}\), gradually decreases.
Statement II : Group 14 contains non-metallic, metallic, as well as metalloid elements.
...

Given below are two statements : one is labelled as Assertion \(\mathbf{A}\) and the other is labelled as Reason \(\mathbf{R}\) :
Assertion A : The first ionisation enthalpy decreases across a period.
Reason \(\mathbf{R}\) : The increasing ...

Anomalous behavior of oxygen is due to its

The element having the highest first ionization enthalpy is

Given below are two statements:
Statement I : Fluorine has most negative electron gain enthalpy in its group.
Statement II : Oxygen has least negative electron gain enthalpy in its group.
In the light of the above statements, choose the mos...

Given below are two statements :
Statement (I) : The \(4 \mathrm{f}\) and \(5 \mathrm{f}\) - series of elements are placed separately in the Periodic table to preserve the principle of classification.
Statement (II) : S-block elements can b...

Given below are two statements :
Statement (I) : Both metals and non-metals exist in p and d-block elements.
Statement (II) : Non-metals have higher ionisation enthalpy and higher electronegativity than the metals.

In the light of the abov...

The transition metal having highest $3^{\text {rd }}$ ionisation enthalpy is :

The correct order of electronegativity for given elements is:

The difference between electron gain enthalpies will be maximum between :

Group-13 elements react with \(\mathrm{O}_{2}\) in amorphous form to form oxides of type \(\mathrm{M}_{2} \mathrm{O}_{3}~(\mathrm{M}=\) element). Which among the following is the most basic oxide?

Which one of the following elements will remain as liquid inside pure boiling water?

The correct increasing order of the ionic radii is

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R)

Assertion (A): The first ionization enthalpy of $3 \mathrm{~d}$ series elements is more than that of group 2 metals

Reason (R): In 3...

Which of the following elements have half-filled f-orbitals in their ground state?

(Given : atomic number $\mathrm{Sm}=62 ; \mathrm{Eu}=63 ; \mathrm{Tb}=65 ; \mathrm{Gd}=64, \mathrm{Pm}=61$ )
A. $\mathrm{Sm}$
B. Eu
C. $\mathrm{Tb}$
D. Gd
E...

Match List I with List II

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Bond dissociation energy of "E-H" bond of the "$\mathrm{H}_{2} \mathrm{E}$ " hydrides of group 16 elements (given below), follows order.
A. $\mathrm{O}$
B. $\mathrm{S}$
C. Se
D. $\mathrm{Te}$

Choose the correct from the options given below...

Total number of acidic oxides among
\(\mathrm{N_2O_3,NO_2,N_2O,Cl_2O_7,SO_2,CO,CaO,Na_2O}\) and \(\mathrm{NO}\) is ____________.

Given below are two statements :
Statement I : The decrease in first ionization enthalpy from B to Al is much larger than that from Al to Ga.
Statement II : The d orbitals in Ga are completely filled.
In the light of the above statements, c...

Inert gases have positive electron gain enthalpy. Its correct order is :

Which of the following statements are not correct?
A. The electron gain enthalpy of \(\mathrm{F}\) is more negative than that of \(\mathrm{Cl}\).
B. Ionization enthalpy decreases in a group of periodic table.
C. The electronegativity of an ...

For elements \(\mathrm{B}, \mathrm{C}, \mathrm{N}, \mathrm{Li}, \mathrm{Be}, \mathrm{O}\) and \(\mathrm{F}\), the correct order of first ionization enthalpy is

Given below are two statements: one is labelled as Assertion \(\mathbf{A}\) and the other is labelled as Reason \(\mathbf{R}\)
Assertion A : The energy required to form \(\mathrm{Mg}^{2+}\) from \(\mathrm{Mg}\) is much higher than that requ...

The correct order of electron gain enthalpy (\(-\) ve value) is :

Given below are two statements. One is labelled as Assertion A and the other is labelled as Reason R.
Assertion A : The first ionization enthalpy for oxygen is lower than that of nitrogen.
Reason R : The four electrons in 2p orbitals of oxy...

The first ionization enthalpy of Na, Mg and Si, respectively, are : 496, 737 and \(786 \mathrm{~kJ} \mathrm{~mol}^{-1}\). The first ionization enthalpy (\(\mathrm{kJ} \,\mathrm{mol}^{-1}\)) of \(\mathrm{Al}\) is :

Element "E" belongs to the period 4 and group 16 of the periodic table. The valence shell electron configuration of the element, which is just above "E" in the group is

Among the following, basic oxide is :

Match List - I with List - II :

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In which of the following pairs, electron gain enthalpies of constituent elements are nearly the same or identical?
(A) Rb and Cs
(B) Na and K
(C) Ar and Kr
(D) I and At
Choose the correct answer from the options given below :

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) : The ionic radii of O2\(-\) and Mg2+ are same.
Reason (R) : Both O2\(-\) and Mg2+ are isoelectronic species.
In the li...

The correct order of increasing ionic radii is

The incorrect statement is

Given two statements below :
Statement I : In \(\mathrm{Cl}_{2}\) molecule the covalent radius is double of the atomic radius of chlorine.
Statement II : Radius of anionic species is always greater than their parent atomic radius.
Choose th...

The correct order of electron gain enthalpies of Cl, F, Te and Po is

The IUPAC nomenclature of an element with electronic configuration [Rn] \(5 \mathrm{f}^{14} 6 \mathrm{d}^{1} 7 \mathrm{s}^{2}\) is :