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Ncert Solutions for Class 11 Chemistry Chapter 10

Ncert Solutions for Class 11 Chemistry Chapter 10 Pdf Download

Adda247 provides NCERT Solutions for class 11 Chemistry chapter 10. The NCERT Solutions provided here will enhance the concepts of the students, as well as suggest alternative methods to solve particular problems to the teachers.

Chemistry is much more than the language of Science. We aim to aid the students with answering the questions correctly using logical approach and methodology. The NCERT Solutions provide ample material to enable students to form a good base with the fundamentals of the subject.

Students who are looking for Class 11 Chemistry NCERT Solutions can refer to this article. Students will be provided detailed Class 11 Chemistry NCERT Solutions. Students can find here NCERT Solutions of Class 11 Chemistry PDF in Hindi and English medium.

Students of Class 11 must be through with Science NCERT Class 11 Chemistry Solutions in order to secure good marks in the board exams. These solutions will not only help the students to prepare for board exams but also prepare for competitive medical and engineering entrance exams.

Chemistry is an interesting subject but many of your students might find it confusing to understand. It can be a struggle for many of you.

Benefits of Solutions of NCERT class 11 Chemistry:

  • NCERT Solutions for Class 11 is helpful to solve questions from other reference books too.
  • NCERT Solutions for Class 11 Chemistry will assist students to cross check answers and prepare for the exams in a strategic way.

The students can access the solutions anywhere while browsing web easily. The solutions are very precise and accurate.


NCERT Solutions of Chemistry Class 11 Chapter 10: The s-block Elements

Hydrogen is the most abundant in this universe, and thus any knowledge about this element allows one to explore numerous scientific phenomenon. Keeping this aspect in mind, CBSE has incorporated this topic into their curriculum so that keen students can learn the basic of this element.

Such a topic may seem challenging for students to decipher. In such a synopsis, they can rely on Hydrogen Class 11 Chemistry NCERT Solutions that provide comprehensive guidance on this topic with its eloquent explanation.

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S-block elements constitute a crucial part in class 11 Chemistry syllabus. Along with the board examination, several all India Entrance examinations like NEET, JEE Mains and advanced etc. also ask different questions from this topic. Hence, students who aspire for such examinations should take this chapter seriously.

Nonetheless, irrespective of the examinations, S block elements Class 11 NCERT Solutions can prove to be beneficial for students who aspire to pursue their career in the world of science.

S-block elements form a distinct group in the periodic table. Resultantly, they also show some particular characteristics. It is these features that make such elements from other metals on the periodic table. S block elements Class 11 NCERT Solution, therefore informs all the standard and unique characteristics of these elements that students require to know.

Besides, learning these concepts from textbooks, students can download the same copy in PDF Format for free and study them whenever they wish to. NCERT Solutions to score better grades in the examination but also allow them to develop significant insight into the topic.

The s-block elements of the Periodic Table are those in which the last electron enters the outermost s-orbital. … Group 1 of the Periodic Table consists of the elements: lithium, sodium, potassium, rubidium, caesium and francium. They are collectively known as the alkali metals.


General Characteristics of s-block Elements

They are soft metals, possess low melting and boiling points, have the largest atomic radii in their corresponding periods and are good conductors of heat and electricity. They have low values of ionisation energies and are hence highly electropositive.

S-block comprises 14 elements namely hydrogen (H), lithium (Li), helium (He), sodium (Na), beryllium (Be), potassium (K), magnesium (Mg), rubidium (Rb), calcium (Ca), cesium (Cs), strontium (Sr), francium (Fr), barium (Ba), and radium (Ra).

The s-block and p-block elements are so called because their valence electrons are in an s orbital or p orbital respectively. They are also called Typical Elements to distinguish them from the transition and inner transition series.


Within the periodic table, the s-block is located to the far left and includes all of the elements in the first two columns (columns 1 and 2) plus helium, which is located in the top right corner in column 8A (column 18 on some versions of the periodic table).

Why does the s-block span two groups of elements? Because s orbitals hold two electrons at most. … Because the three p orbitals can hold a maximum of six electrons.


S block elements are light metals, have low melting and boiling points, have the highest atomic radii in their times of correspondation, and are strong heat and electricity conductors. These have low ionisation energy levels and are thus strongly electropositive.


Oxidation states of s block

All alkali metals show only +1 oxidation state. All alkali earth metals show only +2 oxidation state.

S block elements are highly reactive because the loose their valence electron easily to attain octet. Hence they are highly reactive and utilize very least amount of energy for their reactions.


Some of the important topics covered in NCERT Solutions for Class 11 Chemistry Chapter 10 are:

  • Group 1 elements: Alkali metals
  • General characteristics of the compounds of the alkali metals.
  • Anomalous properties of lithium
  • Biological importance of Sodium and potassium
  • Group 2 elements: Alkaline earth metals
  • General characteristics of compounds of the alkaline earth metals
  • Anomalous behaviour of beryllium
  • Biological importance of magnesium and calcium


Key features of NCERT solutions for Class 11 Chemistry Chapter 9: Hydrogen

  • These solutions are in clear and easy language.
  • Columns are used wherever necessary.
  • Using these solutions, students will be able to address their doubts and conceptual mistakes.

Working out on more and more problems will help students to perform well in class 11 Board exams. NCERT Solution gives the answer to all these exercise in a clear, simple and straightforward way. Students can check their answers with the solutions provided. It is also another way coordination compounds class 11 NCERT solutions help students.


Important questions of NCERT Solutions of Chemistry Class 11 Chapter 10

Question: 1 What are the common physical and chemical features of alkali metals?


Physical properties of alkali metals:

  • Akali metals have low ionisation enthalpies.
  • Alkali metals are highly electropositive in nature.
  • Alkali metals exhibit +1 oxidation states in their compound.
  • Alkali metals impart characteristics colour in nature.

Chemical properties of alkali metals:

  • Alkali metals are highly reactive in nature.
  • Alkali metals hydroxide are highly basic in nature.
  • Alkali metals dissolve in liquid ammonia to form blue and conducting solution.


Question: 2 Discuss the general characteristics and gradation in properties of the alkaline earth metals.


  • Atomic size goes on increasing down the group.
  • Ionisation energy goes on decreasing down the group.
  • They are harder than alkali metals.
  • They are less electropositive than alkali metals.
  • Electropositive character increases on going down the group.


Question: 3 Find out the oxidation state of sodium in Na2O2.


Let x be the oxidation state of Na in Na2O2 2x + 2(-1) = 0, 2x = 2x = +1


Question: 4 Explain why sodium is less reactive than potassium?


It is because ionization enthalpy HI of potassium = 419kJ / mol.

Ionisation enthalpy of sodium = 496 KJ / mol. Since ionization enthalpy of potassium is less than that of sodium, potassium is more reactive than sodium.


Question: 5 Compare the alkali metals and alkaline earth metals with respect to:

  • Ionization enthalpy
  • Basicity of oxides
  • Solubility of hydroxides.


(i). Ionization enthalpy: Because of high nuclear charge the ionization enthalpy of alkaline earth metals are higher than those of the corresponding alkali metals.


(ii). Basicity of oxides: Basicity of oxides of alkali metals are higher than that of alkaline earth metals.


(iii). Solubility of hydroxides: Solubility of hydroxides of alkali metals are higher than that of alkaline earth metals. Alkali metals due to lower ionization enthalpy are more electropositive than the corresponding group 2 elements.


Question: 6 In what ways lithium shows similarities to magnesium in its chemical behaviour?


  • Both react with nitrogen to form nitrides.
  • Both react with O2 to form monoxides.
  • Both the elements have the tendency to form covalent compounds.
  • Both can form complex compounds.


Question: 7 Explain why can alkali and alkaline earth metals not be obtained by chemical reduction method.


Alkali and alkaline earth metals are themselves better reducing agents, and reducing agents better than alkali metals are not available. That is why these metals are not obtained by chemical reduction methods.


Question: 8 Why are potassium and caesium, rather than lithium used in photoelectric cells?


Potassium and caesium have much lower ionisation enthalpy than that of lithium. As a result, these metals easily emit electrons on exposure to light. Due to this, K and Cs are used in photoelectric cells rather than lithium.


Question: 9 When alkali metal dissolves in liquid ammonia, the solution can acquire different colours. Explain the reason for this type of colour change.


When an alkali metal dissolve in liquid ammonia, the solution can acquire different colours, means dilute solutions of alkali metals in liquid ammonia exhibit dark blue colour this is because of ammoniated electrons absorb energy in the visible region of light.

e.g., M + (x + y)NH3 à [M(NH3)x]^+ + [e-(NH3)y]{ammoniated electrons}


However, if the concentration increases above 3M, the colour changes to copper -bronze and it becomes diamagnetic in nature.


Question: 10 Beryllium and magnesium do not give colour to flame whereas other alkaline earth metals do so. Why?


Due to the small size, the ionisation enthalpies of Be and Mg are much lighter than those of other alkaline earth metals. Therefore, a large amount of energy is needed to excite their valence electrons, and that’s why they do not impart colour to the flame.


Question: 11 Discuss the various reactions that occur in the Solvay process.


Solvay process is used to prepare sodium carbonate.

When carbon dioxide gas is bubbled through a brine solution saturated with ammonia, sodium hydrogen carbonate is formed. This sodium hydrogen carbonate is then converted to sodium carbonate.


Step 1: Brine solution is saturated with ammonia.

2NH3 + H2O + CO2   à   (NH4)2 CO3

This ammoniated brine is filtered to remove any impurity.


Step 2: Carbon dioxide is reacted with this ammoniated brine to result in the formation of insoluble sodium hydrogen carbonate.

NaCl  +  NH4HCO3  à  NaHCO3  +  NH4Cl


Step 3: The solution containing crystals of NaHCO3 is filtered to obtain NaHCO3.


Step 4: NaHCO3 is heated strongly to convert it into NaHCO3.

2NaHCO3  à  Na2CO3 +  CO2  + H2O


Step 5: To recover ammonia, the filtrate (after removing NaHCO3) is mixed with Ca(OH)2 and heated.

The overall reaction taking place in Solvay process is  2NaCl  + CaCO3  à  Na2CO3 + CaCl2


FAQs on NCERT Solutions of Chemistry Class 11 Chapter 10

  1. How NCERT Solutions for Class 11 Chemistry Chapter 10 helpful for Class 11 students?

Ans. NCERT Solutions for Class 11 Chemistry Chapter 10 are used by students to get proper grasp of all the concepts of the subjects and also to lay the foundation for their career or further higher studies. Adda247 experts formulate these questions in an easy and understandable manner that helps students solve questions in the most efficient possible ways. We hope these solutions will help CBSE Class 11 students to build a strong foundation of the basics and secure excellent marks in their final exam.


  1. Why should we follow NCERT Solutions for Class 11 Chemistry Chapter 10?

Ans. NCERT Solutions for Class 11 Chapter 10 is the correct learning strategy that is devised to help them master the concepts. Revising from the solutions, along with the textbooks, will help students crack any problems asked in the exams. These solutions help to boost the problem-solving skills of the students, along with their logical reasoning. These are the most popular study materials used by the popular to refer to the CBSE board exams. Practising these solutions help the students to top the final exams and ace the subject.


  1. Where to download NCERT Solutions for Class 11 Chemistry Chapter 10?

Ans. NCERT Solutions for Class 11 Chemistry Chapter 10 can be downloaded by the students in offline from Adda247 website. These solutions are formulated by Adda247 expert faculty, which are present in the NCERT textbook of Class 11 Chemistry. These are according to the latest CBSE syllabus.

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