Daily Practice Problems Physical and Chemical Changes

Question 1:

Which among the following is slow change?

(a) Burning of fire crackers

(b) Burning of fuel

(d) Burning of candle [Level: Easy]

Question 2:

Which among the following is reversible change?

(a) Burning of fire crackers

(b) Formation of Fossil fuel from dead plants & animals

(d) Conversion of solid ammonium chloride to vapours of ammonium chloride [Level: Moderate]

Question 3:

Which among the following is Physical change?

(a) Rusting of iron

(b) Curdling of milk

(d) Dissolution of sugar in water [Level: Moderate]

Question 4:

Which among the following is Chemical change?

(a) Sublimation of Naphthalene

(b) Melting of wax

(d) Dissolution of salt in water [Level: Moderate]

Question 5:

Shyam made delicious sandwiches for breakfast. He forgot to keep the butter he used back in refrigerator after preparing sandwiches. Unfortunately, butter got rancid. The following change is

(a) Physical Change

(b) Chemical Change

(d) Periodic change [Level: Moderate]

Question 6:

No new substance is formed in

(a) Physical Change

(b) Chemical Change

(d) None of the above [Level: Easy]

Question 7:

Chemical change is

(a) only reversible

(b) only irreversible

(d) None of the above [Level: Easy]

Question 8:

Heat energy can be released or absorbed during

(a) Only Physical Change

(b) Only Chemical Change

(d) None of the above [Level: Moderate]

Question 9:

Rinku’s area suffered power cut for 4 hours. She only had a candle at her house. So, she lighted the candle & candle started to burn. Which of following change is taking place?

(a) Only Physical Change

(b) Only Chemical Change

(d) None of the above [Level: Difficult]

Question 10:

__________ of new substance formed during chemical change is different from original substance.

(a) Only Composition

(b) Only Properties

(d) None of the above [Level: Moderate]

Question 11:

Which among the following is man-made change?

(a) Change of seasons

(b) Making of jewellery from gold

(d) Evaporation of sea water [Level: Easy]

Question 12:

Separation of mixture of iron & sulphur is physical change whereas heating mixture of iron & sulphur is chemical change. Why? [Level: Difficult]

Question 13:

Photosynthesis is process by which green plants manufacture food in the presence of sunlight. Answer the following questions:

a) Are any new products formed during photosynthesis?

b) Above change is reversible or irreversible?

c) Is the above change natural or man-made? [Level: Moderate]

Question 14:

Sagar kept milk in dish for some hours. Later when he came back to check he observed milk has become sour. Is the change which took place a physical or chemical change? Give reason. [Level: Difficult]

Question 15:

State why addition of sodium chloride to water is considered as physical change, while addition of dilute sulphuric acid to iron is considered as chemical change. [Level: Difficult]

Question 16:

Sapna was heating solid iodine crystals in a beaker. She observed beautiful purple iodine gas coming out of the beaker. Which of following change took place?

(a) Only reversible change

(b) Only physical change

(d) Chemical change [Level: Difficult]

Question 17:

Give 3 points of difference between physical & chemical changes. [Level: Moderate]

Question 18:

Match the following:

Column A	Column B
1) Tarnishing of copper	a) Periodic change
2) Separation of mixture of ammonium chloride & sand	b) Chemical change
3) Landslide	c) Physical change
4) Change of days & night	d) Non-periodic change

[Level: Moderate]

Question 19:

Give below are some statements: State whether they are true or false. For every false statement write the correct statement.

a) During physical changes composition of original substance does not change but some of the physical properties may change.

b) Cutting of paper into pieces is a chemical change.

c) Change in colour is only observed in chemical change & not in physical change. [Level: Moderate]

Question 20:

Which among the following is fast change?

(a) Burning of fire crackers

(b) Formation of fossil fuel from dead plants & animals

(d) Curdling of milk [Level: Easy]

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In summary, problem-solving after learning a theoretical concept on CBSE Physical and Chemical Changes ICSE 7 Chemistry is an essential part of the learning process. It enhances your understanding, critical thinking abilities, and retention of knowledge. Moreover, it equips you with valuable skills that are applicable in academic, personal, and professional contexts.

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Practicing questions plays a pivotal role in achieving excellence in exams. Just as the adage goes, "Practice makes perfect," dedicating time to solve a diverse range of exam-related questions yields manifold benefits. Firstly, practicing questions allows students to familiarize themselves with the exam format and types of problems they might encounter. This familiarity instills confidence, reducing anxiety and improving performance on the actual exam day. Secondly, continuous practice sharpens problem-solving skills and enhances critical thinking, enabling students to approach complex problems with clarity and efficiency. Thirdly, it aids in identifying weak areas, allowing students to focus their efforts on improving specific topics. Moreover, practice aids in memory retention, as active engagement with the material reinforces learning. Regular practice also hones time management skills, ensuring that students can allocate appropriate time to each question during the exam. Overall, practicing questions not only boosts exam performance but also instills a deeper understanding of the subject matter, fostering a holistic and effective learning experience.

All About Daily Practice Problems on ICSE 7 Chemistry Physical and Chemical Changes NCERT Chapter 2

Our Daily Practice Problems (DPPs) offer a diverse range of question types, including Multiple Choice Questions (MCQs) as well as short and long answer types. These questions are categorized into Easy, Moderate, and Difficult levels, allowing students to gradually progress and challenge themselves accordingly. Additionally, comprehensive solutions are provided for each question, available for download in PDF format - Download pdf solutions as well as Download pdf Questions. This approach fosters a holistic learning experience, catering to different learning styles, promoting self-assessment, and improving problem-solving skills. With our well-structured DPPs, students can excel in exams while gaining a deeper understanding of the subject matter. Hope you found the content on ICSE 7 Chemistry Physical and Chemical Changes NCERT Chapter 2 useful.

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