CBSE Class 10 Science Case Study Questions for Term 2 Exam 2022 | Practice 4 marks questions to get full marks

Check out case study questions curated by experts in CBSE Class 10 Science to prepare for Term 2 Exam 2022. Download Chapter-wise Questions in PDF and practice to score high marks in the exam.

Section C in CBSE Class 10 Science Paper 2 exam will consist of case study questions of 8 marks each. To help students score full marks in this section, we have provided important case study questions that are prepared by subject matter experts who have tremendous experience in a teaching field. These questions are specially designed for CBSE Term 2 Exam considering the latest pattern and reduced syllabus. Students should practice the chapter-wise important questions given below for quick last minute revision and increase their chances of scoring high in CBSE Class 10 Science Term 2 Exam 2022.

Check some important case study questions given below:

Q. Read the following carefully and answer questions,

Atoms in covalent compounds share valence electrons to satisfy the octet. Each atom shares one pair or two pairs or three pairs of electrons depending on its combining potential. In electron dot structures only the number of valence electrons are shown around the symbols of the constituent atoms. Carbon can form single, double or triple bonds with other carbon atoms or any other atom by using its valency of four. The self-linking property of carbons is called catenation. The carbon in hydrocarbons forms aliphatic or cyclic molecules, they are either saturated or unsaturated. On the basis of these facts read the following paragraph and answer the questions given below.

An element X combines with Y to form a colourless, odorless gas, Z which turns lime water milky, the major constituent of all organic molecules. Five X atoms combine with hydrogen to form a cyclic saturated hydrocarbon J and aliphatic unsaturated hydrocarbons Q. Q is used in gas welding.

(1) Identify compound Z and draw its electron dot structure.

(2) Compound Q. Write the chemical formula and IUPAC name of

(3) Q. What is the common name of

(4) How many lone covalent bonds are present in compound J?


1) Z is CO2 Its electron dot structure is

2) C2h2ethene

3) Acetylene

4) 15

Q. Read the following carefully and answer the questions.

Atoms of eight elements A, B, C, D, E, F, G and H have same number of shells but different number of electrons in their outermost shell. It was found that elements A and G combine to form an ionic compound. This compound is added in small amounts to almost all vegetable dishes during cooking. Oxides of elements A and B are basic in nature while those of E and F are acidic. The oxide of D is almost neutral.

On the basis of the above information answer the following questions:

(1) To which group or period of the periodic table do the listed elements belong?

(2) What will be the nature of the compound formed by the combination of elements B and F?

(3) Which of these two elements can definitely be metals?

(4) If the number of electrons in the outermost shell of the elements C and G are 3 and 7 respectively, then write the formula of the compound formed by the combination of C and G.


1. A and B belong to groups 1 and 2 because they form basic oxides.

C belongs to group 13 as it has 3 valence electrons.

D belongs to group 14 as it forms almost neutral oxides.

E and F belong to groups 15 and 16 as they form acidic oxides,

G belongs to group 17 as it has 7 valence electrons and

H belongs to group 18.

They belong to the third period of the periodic table because AG is NaCl, added in small amounts to almost all vegetable dishes during cooking, and Na and Cl belong to the third period.

2. Ionic compounds will be formed because ‘B’ is a metal and ‘F’ is a non-metal. ‘B’ can lose two electrons and ‘F’ can gain two electrons.

3. A and B are definitely metals as they form basic oxides.

4. CG3 is the formula for the compound formed by the combination of C and G.

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