NCERT Solutions For Class 12 Chemistry Chapter 7: The p-Block Elements

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NCERT Solutions for class 12 Chemistry Chapter 7 The p-Block Elements deals with the chemistry of the inorganic ring systems of elements present in p-block elements. Some of the Important topics under this chapter are:

As this chapter has been omitted from the new CBSE Class 12 Chemistry syllabus, no questions can be expected from this chapter. It will be useful for other competitive exam preparation.

Download PDF: NCERT Solutions for Class 12 Chemistry Chapter 7 pdf

NCERT Solutions for Class 12 Chemistry Chapter 7

NCERT Solutions for class 12 Chemistry chapter 7 are as given below.

Class 12 Chapter 7 The p-Block Elements – Important Topics

The p-Block elements consists of compounds whose valence electrons enter any of the three p-orbitals.

Group 13 – Boron Family
Group 14 – Carbon Family
Group 15 – Nitrogen Family
Group 16 – Boron Family
Group 17 – Flourine Family
Group 18 – Noble Gas Family

Some of the important properties of p-Block elementsare as follows:

p-Block elements starts from 13^th group to 18^th group in the periodic table.
The general configuration of p block elements is ns²np^1-6 except Helium.
The p-Block elements consists of metals, nonmetals and metalloids.
The oxidation state of p-block element is maximum when it is equal to its number of valence electrons.

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CBSE CLASS XII Related Questions

1.
(a) Define 'Denatured Protein' with an example.
(b) What happens when glucose reacts with HCN ? Write the reaction involved.
(c) Name the disease caused by the deficiency of Vitamin C.
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2.
Explain the Finkelstein reaction.
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3.
Following reaction takes place in one step:

\(2A + B \rightarrow 2C\)

How will the rate of above reaction change if the volume of the reaction vessel is decreased to one third of its original volume? Will there be any change in the order of reaction with the reduced volume?
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4.
Conductivity of \( 2.5 \times 10^{-4} \) M methanoic acid solution is \( 5.25 \times 10^{-5} \) S cm\(^{-1}\).
(a) Calculate its molar conductivity.
(b) Calculate its degree of dissociation.
[Given : \( \lambda^{\circ}_{(\mathrm{H^+})} = 349.5 \) S cm\(^2\) mol\(^{-1}\) and \( \lambda^{\circ}_{(\mathrm{HCOO^-})} = 50.5 \) S cm\(^2\) mol\(^{-1}\)]
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5.
Match Column I with Column II and choose the correct option :
Column I Column II
a. Osmotic pressure i. \( \Delta \mathrm{T_f} = \mathrm{K_f}\,m \)
b. Elevation of boiling point ii. \( \pi = CRT \)
c. Depression of freezing point iii. \( \frac{\mathrm{P_1^0 - P_1}}{\mathrm{P_1^0}} = \frac{\mathrm{W_2 \times M_1}}{\mathrm{M_2 \times W_1}} \)
d. Relative lowering of vapour pressure iv. \( \Delta \mathrm{T_b} = \mathrm{K_b}\,m \)

Column I	Column II
a. Osmotic pressure	i. \( \Delta \mathrm{T_f} = \mathrm{K_f}\,m \)
b. Elevation of boiling point	ii. \( \pi = CRT \)
c. Depression of freezing point	iii. \( \frac{\mathrm{P_1^0 - P_1}}{\mathrm{P_1^0}} = \frac{\mathrm{W_2 \times M_1}}{\mathrm{M_2 \times W_1}} \)
d. Relative lowering of vapour pressure	iv. \( \Delta \mathrm{T_b} = \mathrm{K_b}\,m \)

a-i, b-ii, c-iii, d-iv
a-ii, b-i, c-iii, d-iv
a-iv, b-iii, c-ii, d-i
a-ii, b-iv, c-i, d-iii

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6.
(i) (I) The \(\mathrm{pK_b}\) value of aniline is higher than that of methylamine. Explain why.
(II) Arrange the following compounds in decreasing order of their basic strength in the gaseous phase :
\(\mathrm{NH_3}\), \(\mathrm{(C_2H_5)_2NH}\), \(\mathrm{(C_2H_5)_3N}\), \(\mathrm{C_2H_5NH_2}\)
(III) What is Hinsberg's reagent ? Mention its one use.
(ii) How will you convert the following :
(I) Nitrobenzene to Benzenediazonium chloride ?
(II) Iodomethane to Ethanamine ?
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