HSC Science (General) ११ वीं कक्षा - Maharashtra State Board Question Bank Solutions

Answer the following.

Explain the screening effect with a suitable example.

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Why do the elements belonging to the same group have similar chemical properties?

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Why the second ionization enthalpy is greater than the first ionization enthalpy?

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Explain electronegativity and electron gain enthalpy. Which of the two can be measured experimentally?

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Consider the elements B, Al, Mg, and K predict the correct order of metallic character:

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The lanthanides are placed in the periodic table at

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If the valence shell electronic configuration is ns²np⁵, the element will belong to

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Which of the following pairs is isoelectronic?

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For the following pair, indicate which of the two species is of large size:

Fe²⁺ or Fe³⁺

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For the following pair, indicate which of the two species is of large size:

Mg²⁺ or Ca²⁺

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Select the smaller ion form the following pair:

K⁺, Li⁺

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Select the smaller ion form the following pair:

N^3–, F^–

With the help of a diagram answer the questions are given below:

1. Which atom should have smaller ionization energy, oxygen, or sulphur?
2. The lithium forms +1 ions while beryllium forms +2 ions?

Define ionic radius

Define electronegativity

What are the valence electrons?

Define ionization enthalpy.

Name the factors on which ionization enthalpy depends?

How does ionization enthalpy vary down the group and across a period?

How the atomic size vary in a group and across a period? Explain with suitable example.