In Class 12 Boards 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 Download of CBSE Class 12 Chemistry Chapter 7 The p-Block Elements Case Study and Passage Based Questions with Answers were Prepared Based on Latest Exam Pattern. Students can solve NCERT Class 12 Chemistry Case Study Questions The p-Block Elements to know their preparation level.
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In CBSE Class 12 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 p-Block Elements Case Study Questions With Answers
Here, we have provided case-based/passage-based questions for Class 12 Chemistry Chapter 7 The p-Block Elements
Case Study/Passage-Based Questions
Case Study 1: Chlorine is a greenish-yellow gas with a pungent and suffocating odor. With dry slaked lime, it gives bleaching powder. Bleaching powder is a mixture of calcium hypochlorite and basic calcium chloride :
[Ca(OCI)2. CaCl2 ·Ca(OH)2· 2 H2O].
The amount of chlorine obtained from a sample of bleaching powder by the treatment with an excess of dilute acids or CO2 is called available chlorine. Chlorine is a powerful bleaching agent. The bleaching effect of chlorine is permanent.
(i) Chlorine gas reacts with_____to form bleaching powder
| (a) Ca(OH)2 | (b) CaCl2 |
| (c) CaSO4 | (d) dry CaO |
Answer: (a) Ca(OH)2
(ii) Chlorine reacts with cold and dilute alkali to form
| (a) chloride | (b) hypochlorite | (c) chlorate | (d) both (a) and (b) |
Answer: (d) both (a) and (b)
(iii) Chlorine is used as a bleaching agent. The bleaching action is due to
| (a) oxidation | (b) chlorination | (c) hydrogenation | (d) reduction |
Answer: (a) oxidation
(iv) Bleaching powder contains a salt of an oxoacid as one of its components. The anhydride of that oxoacid is
| (a) Cl20 | (b) Cl2O7 | (c) CIO2 | (d) Cl2O6 |
Answer: (a) Cl20
Case Study 2: Ozone is an unstable, dark blue diamagnetic gas. It absorbs the UV radiation strongly, thus protecting the people on Earth from the harmful UV radiation from the sun. The use of chlorofluorocarbon (CFC) in aerosol and refrigerator and their subsequent escape into the atmosphere, is blamed for making holes in the ozone layer over Antarctica. Ozone acts as a strong oxidizing agent in acidic and alkaline mediums. For this property, ozone is used as a germicide and disinfectant for sterilizing water. It is also used in the laboratory for the ozonolysis of organic compounds and in the industry for the manufacture of potassium permanganate, artificial silk, etc.
(i) Which of the following statements is not correct for ozone?
(a) It oxidizes lead sulfide
(b) It oxidizes potassium iodide
(c) It oxidizes mercury
(d) It cannot act as a bleaching agent in a dry state.
Answer: (d) It cannot act as a bleaching agent in a dry state.
(ii) Ozone reacts with moist iodine gives
(a) HI
(b) HIO3
(c) I2O5
(d) I2O4
Answer: (b) HIO3
(iii) Ozone acts as an oxidizing agent due to
(a) liberation of nascent oxygen
(b) liberation of oxygen gas
(c) both (a) and (b)
(d) none of these
Answer: (a) liberation of nascent oxygen
(iv) The color of the ozone molecule is
(a) white
(b) blue
(c) pale green
(d) pale yellow
Answer: (b) blue
Case Study 3: The p-Block Elements, encompasses a diverse set of elements in the Periodic Table that include Groups 13 to 18. This variety of elements exhibit several common characteristics, as well as unique properties, based on the presence of their outermost electrons in the p orbital. The chapter examines the trends in properties such as atomic and ionic sizes, ionization enthalpy, electronegativity, and physical and chemical properties across the groups. It also covers the compounds formed by these elements, like oxides, halides, and others and the reactions they undergo. The chapter concludes with a discussion of the important roles these elements and their compounds play in various fields like medicine, agriculture, and industry.
What characterizes the p-Block elements?
A) Their outermost electrons are in the s orbital.
B) Their outermost electrons are in the d orbital.
C) Their outermost electrons are in the f orbital.
D) Their outermost electrons are in the p orbital.
Answer: D) Their outermost electrons are in the p orbital.
How does atomic size typically change across a period in the p-Block?
A) It increases from left to right.
B) It decreases from left to right.
C) It remains constant.
D) There is no fixed pattern.
Answer: B) It decreases from left to right.
What are the compounds formed by p-Block elements?
A) Only oxides.
B) Only halides.
C) Only sulphides.
D) Various types, including oxides and halides.
Answer: D) Various types, including oxides and halides.
What trend is typically observed for ionization enthalpy across a period in the p-Block?
A) It increases from left to right.
B) It decreases from left to right.
C) It remains constant.
D) There is no fixed pattern.
Answer: A) It increases from left to right.
In what fields do p-Block elements and their compounds play significant roles?
A) Only in medicine.
B) Only in agriculture.
C) Only in industry.
D) In various fields, including medicine, agriculture, and industry.
Answer: D) In various fields, including medicine, agriculture, and industry.
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