Periodic Table · JEE Main previous year questions

The correct order of electronegativity for given elements is:

1. A.$\mathrm{C}>\mathrm{P}>\mathrm{At}>\mathrm{Br}$
2. B.$\mathrm{Br}>\mathrm{C}>\mathrm{At}>\mathrm{P}$
3. C.$\mathrm{Br}>\mathrm{P}>\mathrm{At}>\mathrm{C}$
4. D.$\mathrm{P}>\mathrm{Br}>\mathrm{C}>\mathrm{At}$

1. A.
2. B.
3. C.
4. D.

Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R Assertion A : Hydrogen is an environment friendly fuel. Reason R : Atomic number of hydrogen is 1 and it is a very light element. In the light of the above statements, choose the correct answer from the options given below :

1. A.Both A and R are true but R is NOT the correct explanation of A
2. B.A is false but R is true
3. C.A is true but R is false
4. D.Both A and R are true and R is the correct explanation of A

The correct increasing order of the ionic radii is

1. A.${\mathrm{Cl}}^{-}<{\mathrm{Ca}}^{2+}<{\mathrm{K}}^{+}<{\mathrm{S}}^{2-}$
2. B.${\mathrm{K}}^{+}<{\mathrm{S}}^{2-}<{\mathrm{Ca}}^{2+}<{\mathrm{Cl}}^{-}$
3. C.${\mathrm{Ca}}^{2+}<{\mathrm{K}}^{+}<{\mathrm{Cl}}^{-}<{\mathrm{S}}^{2-}$
4. D.${\mathrm{S}}^{2-}<{\mathrm{Cl}}^{-}<{\mathrm{Ca}}^{2+}<{\mathrm{K}}^{+}$

Match List I with List II | List I (Atomic number) | List II (Block of periodic table) | | :--- | :--- | | A. 37 | I. p-block | | B. 78 | II. d-block | | C. 52 | III. f-block | | D. 65 | IV. s-block | Choose the correct answer from the options given below :

1. A.A - II, B - IV, C - I, D - III
2. B.A - IV, B - III, C - II, D - I
3. C.A - IV, B - II, C - I, D - III
4. D.A - I, B - III, C - IV, D - II

Which of the following represents the correct order of metallic character of the given elements?

1. A.K < Mg < Be < Si
2. B.Si < Be < Mg < K
3. C.Be < Si < Mg < K
4. D.Be < Si < K < Mg

1. A.$1$
2. B.$\frac{1}{2}$
3. C.$2$
4. D.$3$

The correct decreasing order for metallic character is :

1. A.Na > Mg > Be > Si > P
2. B.P > Si > Be > Mg > Na
3. C.Si > P > Be > Na > Mg
4. D.Be > Na > Mg > Si > P

Given two statements below : Statement I : In $\mathrm{C}{\mathrm{l}}_2$ 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 the most appropriate answer from options given below :

1. A.Both Statement I and Statement II are correct.
2. B.Both Statement I and Statement II are incorrect.
3. C.Statement I is correct but Statement II is incorrect.
4. D.Statement I is incorrect but Statement II is correct.

The first ionization enthalpies of Be, B, N and O follow the order

1. A.O < N < B < Be
2. B.Be < B < N < O
3. C.B < Be < N < O
4. D.B < Be < O < N

The correct order of increasing ionic radii is

1. A.${\text{Mg}}^{2+}<{\text{Na}}^{+}<{\text{F}}^{-}<{\text{O}}^{2-}<{\text{N}}^{3-}$
2. B.${\text{N}}^{3-}<{\text{O}}^{2-}<{\text{F}}^{-}<{\text{Na}}^{+}<{\text{Mg}}^{2+}$
3. C.${\text{F}}^{-}<{\text{Na}}^{+}<{\text{O}}^{2-}<{\text{Mg}}^{2+}<{\text{N}}^{3-}$
4. D.${\text{Na}}^{+}<{\text{F}}^{-}<{\text{Mg}}^{2+}<{\text{O}}^{2-}<{\text{N}}^{3-}$

The correct order of melting points of hydrides of group 16 elements is :

1. A.${\mathrm{H}}_2\mathrm{S}<{\mathrm{H}}_2\mathrm{Se}<{\mathrm{H}}_2\mathrm{Te}<{\mathrm{H}}_2\mathrm{O}$
2. B.${\mathrm{H}}_2\mathrm{O}<{\mathrm{H}}_2\mathrm{S}<{\mathrm{H}}_2\mathrm{Se}<{\mathrm{H}}_2\mathrm{Te}$
3. C.${\mathrm{H}}_2\mathrm{S}<{\mathrm{H}}_2\mathrm{Te}<{\mathrm{H}}_2\mathrm{Se}<{\mathrm{H}}_2\mathrm{O}$
4. D.${\mathrm{H}}_2\mathrm{Se}<{\mathrm{H}}_2\mathrm{S}<{\mathrm{H}}_2\mathrm{Te}<{\mathrm{H}}_2\mathrm{O}$

The ionic radii of ${\mathrm{K}}^{+}$, $\mathrm{N}{\mathrm{a}}^{+}$, $\mathrm{A}{\mathrm{l}}^{3+}$ and $\mathrm{M}{\mathrm{g}}^{2+}$ are in the order:

1. A.$\mathrm{N}{\mathrm{a}}^{+}<{\mathrm{K}}^{+}<\mathrm{M}{\mathrm{g}}^{2+}<\mathrm{A}{\mathrm{l}}^{3+}$
2. B.$\mathrm{A}{\mathrm{l}}^{3+}<\mathrm{M}{\mathrm{g}}^{2+}<{\mathrm{K}}^{+}<\mathrm{N}{\mathrm{a}}^{+}$
3. C.$\mathrm{A}{\mathrm{l}}^{3+}<\mathrm{M}{\mathrm{g}}^{2+}<\mathrm{N}{\mathrm{a}}^{+}<{\mathrm{K}}^{+}$
4. D.${\mathrm{K}}^{+}<\mathrm{A}{\mathrm{l}}^{3+}<\mathrm{M}{\mathrm{g}}^{2+}<\mathrm{N}{\mathrm{a}}^{+}$

The ionic radii of ${\mathrm{F}}^{-}$ and ${\mathrm{O}}^{2-}$ respectively are $1.33\mathring{A}$ and $1.4\mathring{A}$, while the covalent radius of N is $0.74\mathring{A}$. The correct statement for the ionic radius of ${\mathrm{N}}^{3-}$ from the following is :

1. A.It is smaller than ${\mathrm{F}}^{-}$ and N
2. B.It is bigger than ${\mathrm{O}}^{2-}$ and ${\mathrm{F}}^{-}$
3. C.It is bigger than ${\mathrm{F}}^{-}$ and N, but smaller than of ${\mathrm{O}}^{2-}$
4. D.It is smaller than ${\mathrm{O}}^{2-}$ and ${\mathrm{F}}^{-}$, but bigger than of N

The ionic radius of $\mathrm{N}{\mathrm{a}}^{+}$ ions is $1.02\text{ A˚}$. The ionic radii (in $\text{A˚}$) of $\mathrm{M}{\mathrm{g}}^{2+}$ and $\mathrm{A}{\mathrm{l}}^{3+}$, respectively, are

1. A.$1.05\text{ and }0.99$
2. B.$0.72\text{ and }0.54$
3. C.$0.85\text{ and }0.99$
4. D.$0.68\text{ and }0.72$

The first ionization energy of magnesium is smaller as compared to that of elements X and Y, but higher than that of Z. The elements X, Y and Z, respectively, are :

1. A.neon, sodium and chlorine
2. B.argon, chlorine and sodium
3. C.chlorine, lithium and sodium
4. D.argon, lithium and sodium

An element of group 15, which is a metal and forms a hydride with strongest reducing power among group 15 hydrides. The element is :

1. A.As
2. B.Sb
3. C.Bi
4. D.P

Electromagnetic radiation of wavelength 663 nm is just sufficient to ionise the atom of metal A. The ionization energy of metal A in $\mathrm{kJ}\mathrm{mo}{\mathrm{l}}^{-1}$ is ____. (Rounded off to the nearest integer) $[\mathrm{h}=6.63\times 10^{-34}\mathrm{Js},\mathrm{c}=3.00\times 10^8\mathrm{m}{\mathrm{s}}^{-1},{\mathrm{N}}_{\mathrm{A}}=6.02\times 10^{23}\mathrm{mo}{\mathrm{l}}^{-1}]$

The set that contains atomic numbers of only transition elements, is :

1. A.21, 32, 53, 64
2. B.9, 17, 34, 38
3. C.37, 42, 50, 64
4. D.21, 25, 42, 72

The atomic number of Unnilunium is _______.

The atomic number of the element unnilennium is :

1. A.109
2. B.102
3. C.119
4. D.108

Among the statements (I – IV), the correct ones are: (I) Be has smaller atomic radius compared to Mg. (II) Be has higher ionization enthalpy than Al. (III) Charge/radius ratio of Be is greater than that of Al. (IV) Both Be and Al form mainly covalent compounds.

1. A.(I), (II) and (IV)
2. B.(II), (III) and (IV)
3. C.(I), (III) and (IV)
4. D.(I), (II) and (III)

The five successive ionization enthalpies of an element are 800, 2427, 3658, 25024 and $32824\mathrm{kJ}\mathrm{mo}{\mathrm{l}}^{-1}$. The number of valence electrons in the element is :

1. A.2
2. B.3
3. C.4
4. D.5

Three elements X, Y and Z are in the $3^{\mathrm{rd}}$ period of the periodic table. The oxides of X, Y and Z, respectively, are basic, amphoteric and acidic. The correct order of the atomic numbers of X, Y and Z is :

1. A.$\mathrm{X}<\mathrm{Z}<\mathrm{Y}$
2. B.$\mathrm{Y}<\mathrm{X}<\mathrm{Z}$
3. C.$\mathrm{Z}<\mathrm{Y}<\mathrm{X}$
4. D.$\mathrm{X}<\mathrm{Y}<\mathrm{Z}$

B has a smaller first ionization enthalpy than Be. Consider the following statements : (I) It is easier to remove 2p electron than 2s electron (II) 2p electron of B is more shielded from the nucleus by the inner core of electrons than the 2s electrons of Be. (III) 2s electron has more penetration power than 2p electron. (IV) atomic radius of B is more than Be (Atomic number B = 5, Be = 4) The correct statements are :

1. A.(I), (III) and (IV)
2. B.(II), (III) and (IV)
3. C.(I), (II) and (IV)
4. D.(I), (II) and (III)