Q: Identify the correct order of increasing ionic sizes

(c) Al3+<F−<O2−<Cl−The electronic configurations of the given ions areAl3+:(1s)2(2 s)2(2p)6O2−:(1 s)2(2 s)2(2p)6 F−:(1 s)2(2 s)2(2p)6Cl−:(1 s)2(2 s)2(2p)6(3 s)2(3p)6The size of Cl−will be the largest as its outer shell belongs to the quantum number n=3. Of the remaining species Al3+ will have the minimum ionic size because of three positive charge and O2− will have maximum ionic size because of two negative charge.

Q: The ionic sizes decreases in the order

(b) S2−>K+>Sc3+>V5+>Mn7+The given species are isoelectronic. The size of these species decreases with increase in the positive charge.

Question 1

The fifth period of modern periodic table includes

Accepted Answer

(b) 18 elements

Question 2

In the sixth period, the orbitals being filled are

Accepted Answer

(d) 6 s,4f,5 d,6p

Question 3

In Lother Meyer plot of atomic volume versus atomic mass, the peaks are occupied by

Accepted Answer

In Lother Meyer plot of atomic volume versus atomic mass, the peaks are occupied by (a) alkali metals

Question 4

The number of periods in the long form of periodic table is

Accepted Answer

(c) 7

Question 5

The atomic number of element next to 53​I in the same group is

Accepted Answer

(c) 85

Question 6

The number of elements in the fourth period of the periodic table is

Accepted Answer

(b) 18

Question 7

An element X belongs to Group 14 and 2nd  period of the periodic table. Its atomic number will be

Accepted Answer

(a) 6

Question 8

The atomic numbers of elements of the second inner transition elements lie in the range of

Accepted Answer

(c) 90 to 103

Question 9

The total number of elements in Groups 8 to 10 of the periodic table is

Accepted Answer

(d) 9

Question 10

The atomic numbers of elements of the lanthanide series lie in the range of

Accepted Answer

(a) 58 to 71

Question 11

An element X belongs to Group 16 and 5 th period. Its atomic number is

Accepted Answer

(c) 52

Question 12

The atomic number of In is 49 . It belongs to

Accepted Answer

(b) 5 th period

Question 13

The elements 30​Zn,48​Cd and 80​Hg belong to

Accepted Answer

(c) 12th group

Question 14

The element with atomic number 105 is known as

Accepted Answer

(b) Unp

Question 15

Atomic radii of fluorine and neon in Angstrom units are respectively given by

Accepted Answer

(a) 0.72,1.60

Question 16

Which one of the following is the smallest in size?

Accepted Answer

(d) Na+Normally the size of an atom decreases from left to right across the periodic table and size increases from top to bottom. But here since they are ions, we have to consider their ionic values also.In the case of N3− it has gained 3 electrons additionally whereas O2− has gained 2 electrons additionallyF−gained one electron additionally but in case of Na+it has lost an electron.When an electron is lost the repulsion between electrons in a shell decreases as there will be fewer electrons present and at the same time effective nuclear charge experienced by the remaining electrons will be more as there will be fewer electrons to shield one another from the nucleus cause shrinking of ions and decrease in size.

Question 17

Which one of the following has the minimum atomic size?

Accepted Answer

(b) Be
Atomic size increases down the group and decreases in period from left to right.

Question 18

Atomic sizes of the following elements decreases in the order

Accepted Answer

(d) Li>Be>B
The correct order of atomic radius of Li, Be and B is Li(1.23)>Be(0.89)>B(0.80).

Question 19

Identify the correct order of increasing ionic sizes

Accepted Answer

(c) Al3+<F−<O2−<Cl−The electronic configurations of the given ions areAl3+:(1s)2(2 s)2(2p)6O2−:(1 s)2(2 s)2(2p)6​ F−:(1 s)2(2 s)2(2p)6Cl−:(1 s)2(2 s)2(2p)6(3 s)2(3p)6​The size of Cl−will be the largest as its outer shell belongs to the quantum number n=3. Of the remaining species Al3+ will have the minimum ionic size because of three positive charge and O2− will have maximum ionic size because of two negative charge.

Question 20

The ionic sizes decreases in the order

Accepted Answer

(b) S2−>K+>Sc3+>V5+>Mn7+The given species are isoelectronic. The size of these species decreases with increase in the positive charge.

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Solutions for IIT JEE Advanced Comprehensive Chemistry by K.L.Kapoor

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