In Class 11 Final Term 2 Exams there will be Case studies and Passage Based Questions will be asked, So practice these types of questions. Study Rate is always there to help you. Free PDF Downloads of CBSE Class 11 Chemistry Chapter 10 Case Study and Passage-Based Questions with Answers were Prepared Based on the Latest Exam Pattern. Students can solve Class 11 Chemistry Case Study Questions The s-Block Elements to know their preparation level.
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In CBSE Class 11 Chemistry Paper, There will be a few questions based on case studies and passage-based as well. In that, a paragraph will be given, and then the MCQ questions based on it will be asked.
The s-Block Elements Case Study Questions With Answers
Here, we have provided case-based/passage-based questions for Class 11 Chemistry Chapter 10 The s-Block Elements
Case Study/Passage-Based Questions
Case Study 1: Alkali metals have the lowest ionization energy in their corresponding period in the periodic table because they have large size which results in a large distance between the nucleus and the outermost electron. The ionization energy of alkali metals decreases from Li to Cs due to an increase in atomic size. The first ionization energy of alkali metals is very low but they have a very high value of second ionization energy.
Alkali metals are characterised by
(a) good conductors of heat and electricity
(b) high melting points
(c) low oxidation potentials
(d) high ionisaiton potentials.
Answer: (a) good conductors of heat and electricity
Metals dissolve in liquid ammonia giving coloured solutions which are conducting in nature. The colour of the solution and reason of its conductance is
(a) yellow, NH4+
(b) blue, ammoniated metals
(c) orange, [M(NH3)x]+
(d) blue, ammoniated electron
Answer: (d) blue, ammoniated electron
Alkali metals displace hydrogen from water forming bases due to the reason that
(a) they are far above the hydrogen in electrochemical series based on oxidation potential
(b) they are far below the hydrogen in electrochemical series based on oxidation potential
(c) their ionization potential is less than that of other elements.
(d) they contain only one electron in their outermost shell
Answer: (b) they are far below the hydrogen in electrochemical series based on oxidation potential
Case Study/Passage-Based Questions
Case Study 2: All alkali metals dissolve and form a blue solution in liquid ammonia. When alkali metals are dissolved in liquid ammonia, there is a considerable expansion in total volume hence such solutions are called expanded metals. The blue solution of an alkali metal in ammonia shows certain characteristic properties which are explained on the basis of the formation of ammoniated (solvated) metal cations and ammoniated electrons in the metal ammonia solution in the following way :
The blue solution is paramagnetic and has high electrical conductivity due to the presence of unpaired electrons in the cavities in the ammoniacal solution.
Sodium dissolves in liquid NH3 to give a deep blue solution. This is due to
(a) ammoniated Na+
(b) ammoniated Na–
(c) formation of Na+/Na– pair
(d) ammoniated electrons.
Answer: (d) ammoniated electrons.
The increasing order of the density of alkali metals is
(a) Li < K < Na < Rb < Cs (b) Li < Na < K < Rb < Cs (c) Cs < Rb < Na < K < Li (d) Cs < Rb < K < Na < Li
Answer: (a) Li < K < Na < Rb < Cs
The reaction between sodium and water can be made less vigorous by
(a) lowering the temperature
(b) adding a little alcohol
(c) amalgamating sodium
(d) adding a little acetic acid.
Answer: (c) amalgamating sodium
Case Study 3: The s-block elements are a group of elements in the periodic table that have their outermost electron in the s orbital. These elements include the alkali metals and alkaline earth metals, which are highly reactive due to the presence of only one or two electrons in their outermost shell. Alkali metals, such as lithium, sodium, and potassium, are soft metals with low densities and low melting points. They readily form +1 cations in chemical reactions. Alkaline earth metals, such as magnesium, calcium, and strontium, have slightly higher melting points than alkali metals and form +2 cations. Both groups of elements are essential for various industrial and biological processes. They play crucial roles in the functioning of the human body, and their compounds are widely used in agriculture and medicine. However, due to their reactivity, they are usually found in nature in the form of compounds rather than as pure elements.
The s-block elements have their outermost electron in the:
(a) p orbital
(b) d orbital
(c) s orbital
(d) f orbital
Answer: (c) s orbital
Alkali metals are highly reactive due to the presence of:
(a) Full outermost shell
(b) Only one electron in their outermost shell
(c) Complete d orbital
(d) Two electrons in their outermost shell
Answer: (b) Only one electron in their outermost shell
Alkaline earth metals form cations with a charge of:
(a) +1
(b) +2
(c) -1
(d) -2
Answer: (b) +2
The alkali metal with the lowest melting point is:
(a) Sodium
(b) Potassium
(c) Lithium
(d) Rubidium
Answer: (c) Lithium
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