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(A) : Increase in the atomic radius from...

(A) : Increase in the atomic radius from B to Al is more than that of consecutive elements of the same group
(R) : Electrons in penultimate shell have greater screening effect

A

Both A and R are correct. R is the correct explanation of A.

B

Both A and R are correct. R is not the correct explanation of A.

C

A is true, but R is false

D

A is falsc, but R is true

Text Solution

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The correct Answer is:
C
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(A) : Mg^(2+) and Al^(3+) are isolectronic but the magnitude of ionic radius of Al^(3+) is less than that in Mg^(2+) . (R ) : The effective nuclear charge on the outermost electrons in Al^(3+) is greater than that in Mg^(2+) .

Screening effect influences A) atomic radius B) Ionisation enthalpy C) electron gain enthalpy

Assertion (A) While going from left to right of the periodic table, the atomic size decreases more rapidly for the 3d-series compared to the 4 f-series of elements. Reason R 3d-electrons experience lesser shielding then 4 f-electrons. The correct answer is

The atom or group which has less power to attract the electrons than hydrogen is said to have + I effect

Choose the right properties of periodic table. (a) Atomic radius increases from top to bottom along a group. (b) Atomic radius decreases from left to right along a period. (c) Valency remains the same in a group. (d) lonisation energy increases on moving down a group.

The amount of energy released when an electron is added to an isolated gaseous atom to produce a monovalent anion is called electron affinity or first electron affinity or electron gain enthalpy. The first electron is given a negative sign as the addition of an electron to a neutral atom is an exoergic process. The addition of electron to A^(-1) requires energy to overcome the force of repulsion. Thus, the second electron affinity is an endoergic process. The magnitude of electron affinity depends on a number of factors such as (i) atomic size (ii) effective nuclear charge (iii) screening effect (iv) half and fully filled orbitals and (v) shape of orbital. In general, electron affinity increases as the atomic radii decrease in a period. However, there are exceptions when the atoms have stable configurations. In a group, electron affinity decreases as the size increases. However, the members of 3rd period have somewhat higher values than the members in the 2nd period of the same subgroups. Which of the following processes is endoergic in nature ?

Identify the correct statements from the following (i) The atomic radius of Al is lower than the atomic radius of Ga. (ii) Boron exists in many allotropic forms. (iii) The melting point of Ga is lowest among the group 13 elements.

It is not possible to measure the atomic radius precisely since the electron cloud surrounding the atom doesnot have sharp boundary. One practical approach to estimate the size of an atom of a non-metallic element is to measure the distance between two atoms when they are bound together by a single bond in a covalent molecule and then dividing by two. For metals we define the term "metallic radius" which is taken as half the internuclear distance separating the metal cores in the metallic crystal. The vander Waal's radius represents the overall size of the atoms which includes its valence shell in a nonbonded situation. It is the half of the distance between two similar atoms in separate molecules in a solid. The atomic radius decreases across a period and increases down the group. Same trends are observed in case of ionic radius. Ionic radius of the species having same number of electrons depends on the number of protons in their nuclei. The correct order of radii is

It is not possible to measure the atomic radius precisely since the electron cloud surrounding the atom doesnot have sharp boundary. One practical approach to estimate the size of an atom of a non-metallic element is to measure the distance between two atoms when they are bound together by a single bond in a covalent molecule and then dividing by two. For metals we define the term "metallic radius" which is taken as half the internuclear distance separating the metal cores in the metallic crystal. The vander Waal's radius represents the overall size of the atoms which includes its valence shell in a nonbonded situation. It is the half of the distance between two similar atoms in separate molecules in a solid. The atomic radius decreases across a period and increases down the group. Same trends are observed in case of ionic radius. Ionic radius of the species having same number of electrons depends on the number of protons in their nuclei. Which of the following statement is correct?

It is not possible to measure the atomic radius precisely since the electron cloud surrounding the atom doesnot have sharp boundary. One practical approach to estimate the size of an atom of a non-metallic element is to measure the distance between two atoms when they are bound together by a single bond in a covalent molecule and then dividing by two. For metals we define the term "metallic radius" which is taken as half the internuclear distance separating the metal cores in the metallic crystal. The vander Waal's radius represents the overall size of the atoms which includes its valence shell in a nonbonded situation. It is the half of the distance between two similar atoms in separate molecules in a solid. The atomic radius decreases across a period and increases down the group. Same trends are observed in case of ionic radius. Ionic radius of the species having same number of electrons depends on the number of protons in their nuclei. Which one among the following sets of ions represents the collection of isoelectronic species?

AAKASH SERIES-ELEMENTS OF BORON FAMILY-OBJECTIVE EXERCISE - 2
  1. Among the III A group elements, the difference in the atomic radius is...

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  2. The correct order of ionization potential [IP(1)] among the IIA group ...

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  3. (A) : Increase in the atomic radius from B to Al is more than that of ...

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  4. Which of the following does not undergo hydrolysis?

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  5. The product formed in the reaction BCl(3)+H(2)Orarr

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  6. The correct increasing order of the stability of Al, Ga^(+), In^(+), T...

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  7. In the electrolysis of alumina using cryolite, the reaction that takes...

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  8. Hydrogen gas is liberated when aluminium is treated with A) Air B)...

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  9. Which of the following is weakest Lewis acid ?

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  10. Aluminium reacts with concentrated H(2)SO(4) to liberate SO(2) gas. In...

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  11. In the reaction between boron and sodium hydroxide to liberate hydroge...

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  12. Strongest oxidant among the following is

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  13. Electronegativity of aluminium is 1.5. Electro negativity of thallium ...

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  14. The products formed when boron trichloride is reduced with lithium alu...

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  15. Borax is chemically

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  16. NA(2)B(4)O(7).10H(2)O can also be represented as

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  17. Which of the following is a correct match?

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  18. BCI(3) does not exist as dimer but BH, exist as dimer because

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  19. What is Z in the following reactions? BCl(3)+H(2)underset(450^(@)C)o...

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  20. Observe the following statements : 1) H(3)BO is used as antiseptic ...

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