Class 10 important Questions CBSE

 

CBSE 10th Science 2 Marks Questions: The CBSE Class 10 Science Board Paper 2024 will comprise 39 questions distributed into five sections. Section B will be the section of the question paper that will have six questions of two marks each. Thus, this whole section will have 12 marks. It is suggested that answers to these questions should be in the range of 30 to 50 words. There are multiple topics out of which two markable questions can be formed.

Here, you will get chapter-wise 2-mark questions for CBSE Class 10 Science. These questions will be from important topics, and you might see related questions in your exam paper. Check out the 10th 2-mark questions with solutions here in a chapter-wise PDF.

List of Important Questions of 2 Marks for Class 10th Science with Solutions

1. During the rusting of iron, which of the following statements is INCORRECT?
2. (a) Iron loses electrons. (b) Oxygen gains electrons. (c) Iron oxide is formed. (d) The reaction is exothermic.

Answer:

The correct answer is: (b) Oxygen gains electrons.

Explanation:

During the rusting of iron, the process involves the reaction of iron with oxygen and water to form iron oxide (rust). The correct statements are:

(a) Iron loses electrons: This is correct. In the rusting process, iron undergoes oxidation, losing electrons.

(b) Oxygen gains electrons: This statement is incorrect. Oxygen does not gain electrons; instead, it accepts electrons in the reduction half-reaction.

(c) Iron oxide is formed: This is correct. The rust formed is essentially iron oxide, which is a compound of iron and oxygen.

(d) The reaction is exothermic: This is correct. The rusting of iron is an exothermic process, meaning it releases energy.

2. Balance the following chemical equation and state the type of reaction: CaCO₃ + HCl → CaCl₂ + CO₂ + H₂O

Answer: CaCO₃ + 2HCl → CaCl₂ + CO₂ + H₂O (Double displacement reaction). In this case, calcium carbonate (CaCO₃) reacts with hydrochloric acid (HCl) to produce calcium chloride (CaCl₂), carbon dioxide (CO₂), and water (H₂O).

3. What happens when zinc sulphate solution is added to barium chloride solution? Identify the precipitate formed and type of reaction.

Answer: White precipitate of barium sulphate forms. It is a double displacement reaction.

When zinc sulfate solution (ZnSO₄) is added to barium chloride solution (BaCl₂), a precipitation reaction occurs. The balanced chemical equation for the reaction is:

ZnSO₄ + BaCl₂→ZnCl₂ + BaSO₄ 

In this reaction, zinc sulfate reacts with barium chloride to produce zinc chloride (ZnCl₂) and barium sulfate (BaSO₄ ). The barium sulfate formed is insoluble in water and appears as a white precipitate. So, the precipitate formed is BaSO₄, and the type of reaction is a double displacement reaction with the formation of a precipitate.

4. Differentiate between combustion and decomposition reactions using examples from everyday life.

Answer: Combustion: Combines with oxygen, releases heat and light (e.g., burning wood). Decomposition: Breaks down one compound into simpler substances, often requiring external energy (e.g., thermal decomposition of calcium carbonate).

5. Write the chemical equation for the reaction between magnesium metal and dilute hydrochloric acid. Identify the gas evolved and its characteristic property.

Answer: Mg + 2HCl → MgCl₂ + H₂ (Hydrogen gas; burns with a popping sound)

6. Explain the concept of coefficients in a balanced chemical equation.

Answer: Coefficients represent the number of molecules or atoms of each reactant and product involved in the reaction, ensuring the law of conservation of mass.

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CBSE Class 10 Science Unit-Wise Weightage

Follow the table below to know the unit-wise mark distribution and accordingly aim for the chapters to be revised during the final board exam.

Unit	Marks
I. Chemical Substances-Nature and Behaviour	25
II. World of Living	25
III. Natural Phenomena	12
IV. Effects of Current	13
V. Natural Resources	05
Total	80
Internal assessment	20
Grand Total	100

CBSE Class 10 Science Question Paper Pattern

Check the CBSE Class 10 Science BoardScience Exam 2024 question paper pattern and build a time management strategy accordingly. 

Type of Question	No. of Questions	Marks Allotted per question	Total Marks
Objective Type	20	1 mark per question	20 x 1 = 20
Very Short Answer Type	6	2 marks per question	6 x 2 = 12
Short Answer Type	7	3 marks per question	7 x 3 = 21
Long Answer Type	3	5 marks per question	3 x 5 = 15
Source Based/Case Based	3	4 marks per question	3 x 4 = 12