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.
The following reactions occur at the anode during the electrolysis of aqueous sodium chloride solution: \[ Cl^-_{(aq)} \rightarrow \frac{1}{2}Cl_2(g)+e^- \qquad E^\circ_{\text{cell}}=1.36\,V \] \[ 2H_2O(l) \rightarrow O_2(g)+4H^+(aq)+4e^- \qquad E^\circ_{\text{cell}}=1.23\,V \] Which reaction is feasible at the anode and why?
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2.
What is meant by lanthanoid contraction? (ii) Why do transition metals form coloured compounds? (iii) Why are $E^\circ_{M^{2+}/M}$ values for Mn and Zn more negative than expected? (iv) Which is the most stable oxidation state of Cu and why? (v) Why is Ce$^{4+}$ in aqueous solution a good oxidising agent?
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3.
According to Werner's theory, the primary valencies of the central metal atom :
- are satisfied by neutral molecules or negative ions.
- are equal to its coordination number.
- are satisfied by negative ions.
- are non-ionisable.
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4.
Answer the following: (I) Which isomer of C$_4$H$_9$Br is most reactive towards S$_N$1 reaction? (II) Predict the alkene that would be formed by dehydrohalogenation of 1-Bromo-1-methylcyclohexane. (III) Although chlorine shows strong $-I$ effect, yet it is ortho/para-directing in electrophilic aromatic substitution reactions. Why? (ii) Write the major product in the following reactions: (I)
(II)
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5.
A solution is prepared by dissolving 0.025 g of potassium sulphate in 2 L of water at 27$^\circ$C. Assuming potassium sulphate is completely dissociated, determine its osmotic pressure. Given: \[ R=0.082 \, L\,atm\,K^{-1}mol^{-1} \] \[ \text{Molar mass of }K_2SO_4=174\,g\,mol^{-1} \] (ii) What type of azeotrope will be formed by a solution of acetone and chloroform? Give reason.
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6.
(I) Which of the following is more reactive towards S$_N$1 reaction: 2-Bromo-2-methylbutane or 1-Bromopentane (II) What type of halide is present in the following compound: \[ \begin{array}{c} CH_3-CH-C=CH_2\\ |\\ CH_3 \end{array} \] \[ | \] \[ Cl \] (III) Why is chloroform stored in dark coloured bottles? (ii) Define the following terms: (I) Ambident Nucleophiles (II) Racemic mixture
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