NCERT Solutions for Class 7 Science Chapter 6

NCERT Solutions for Class 7 Science Chapter 6 Physical and Chemical Changes in English Medium or Adhyay 6 Bhautik aur Rasaynik Parivartan in Hindi Medium free to download in PDF or View online without downloading for 2020-21. 7th Science Chapter 6 Explanation in Hindi and English Medium videos format is also given below to use free. Video solutions and pdf solutions both are explain well in easy to understand language and based on latest NCERT Text Books for the academic session 2020–21. All the contents are free to use. No login or password is required to access PDF files or Videos contents on Tiwari Academy website or apps.

Share Your View with your friends in Discussion Forum. Download Class 7 Offline and Online Apps for academic session 2020-2021. For any educational help, please contact us without any hesitation.

NCERT Solutions for Class 7 Science Chapter 6

Class: 7Science (English and Hindi Medium)
Chapter 6:Physical and Chemical Changes

Class 7 Science Chapter 6 Answers

CBSE NCERT Solutions for Class 7 Science Chapter 6 Physical and Chemical Changes is given below to use online or download in PDF format. Visit to Discussion Forum to ask your doubts. Download Class 7 Science App 2020-21 in Hindi and English Medium for offline use.

Class 10 Science Chapter 6 Explanation in Hindi and English

Class 10 Science Chapter 6 Explanation in English
Class 10 Science Chapter 6 Explanation in Hindi

Class 10 Science Chapter 6 Explanation Topic 6.1 and 6.2

Class 10 Science Chapter 6 Explanation Topic 6.1
Class 10 Science Chapter 6 Explanation Topic 6.2

Class 10 Science Chapter 6 Explanation Topic 6.3 and 6.4

Class 10 Science Chapter 6 Explanation Topic 6.3
Class 10 Science Chapter 6 Explanation Topic 6.4

NCERT Solutions for Class 7 Science in Hindi Video

Important Questions on 7th Science Chapter 6 for Practice

    1. Which of the following is a physical change?
      (a) Rusting of iron
      (b) Combustion of magnesium ribbon
      (c) Burning of candle
      (d) Melting of wax
    2. Two drops of dilute sulphuric acid were added to 1 g of copper sulphate powder and then small amount of hot water was added to dissolve it (step I). On cooling, beautiful blue coloured crystals got separated (step II). Step I and step II are:
      (a) physical and chemical changes respectively.
      (b) chemical and physical changes respectively.
      (c) both physical change.
      (d) both chemical change.
    3. Which of the following is a chemical change?
      (a) Twinkling of stars
      (b) Cooking of vegetables
      (c) Cutting of fruits
      (d) Boiling of water
    4. Iron pillar near the Qutub Minar in Delhi is famous for the following facts. Which of these facts is responsible for its long stability?
      (a) It is more than 7 metres high.
      (b) It weighs about 6000 kg.
      (c) It was built more than 1600 years ago.
      (d) It has not rusted after such a long period.
    5. A chemical change may involve –
      (a) change in colour only
      (b) change in temperature only
      (c) evolution of gas only
      (d) any or all of the above
    6. Galvanisation is a process used to prevent the rusting of which of the following?
      (a) Iron
      (b) Zinc
      (c) Aluminium
      (d) Copper
    7. Which of the following is/are true when milk changes into curd?
      (i) Its state is changed from liquid to semi solid.
      (ii) It changes colour.
      (iii) It changes taste.
      (iv) The change cannot be reversed.
      Choose the correct option from below:
      (a) (i) and (ii) are correct
      (b) (ii) and (iii) are correct
      (c) (i), (iii) and (iv) are correct
      (d) (i) to (iv) are correct
    8. Paheli’s mother made a concentrated sugar syrup by dissolving sugar in hot water. On cooling, crystals of sugar got separated. This indicates a –
      (a) physical change that can be reversed.
      (b) chemical change that can be reversed.
      (c) physical change that cannot be reversed.
      (d) chemical change that cannot be reversed.
    9. A man painted his main gate made up of iron, to
      (i) prevent it from rusting. (ii) protect it from sun. (iii) make it look beautiful. (iv) make it dust free.
      Which of the above statement(s) is/are correct?
      (a) (i) and (ii)
      (b) (ii) and (iii)
      (c) only (ii)
      (d) (i) and (iii)
    10. Which of the following statement is incorrect for a chemical reaction?
      (a) Heat may be given out but never absorbed.
      (b) Sound may be produced.
      (c) A colour change may take place.
      (d) A gas may be evolved.
Answers of Important Questions (MCQ)
    • 1 (d)
    • 2 (c)
    • 3 (b)
    • 4 (d)
    • 5 (d)
    • 6 (a)
    • 7 (c)
    • 8 (a)
    • 9 (d)
    • 10 (a)

Important NCERT Questions Class 7 Science Chapter 6

Fill in the blanks: When carbon dioxide is passed through lime water, it turns milky due to the formation of _________.
When carbon dioxide is passed through lime water, it turns milky due to the formation of Calcium carbonate (CaCO3).
रिक्त स्थान को भरिए – खाने के सोडे का रासायनिक नाम ___________________ है।
खाने के सोडे का रासायनिक नाम सोडियम बाइकार्बोनेट या सोडियम हाइड्रोजन कार्बोनेट (NaHCO3) है।
When a candle burns, both physical and chemical changes take place. Identify these changes. Give another example of a familiar process in which both the chemical and physical changes take place.
Physical Changes: On heating, candle wax gets melted is a physical change. Since it again turns into solid wax on cooling.
Chemical Changes: The wax near to flame burns and gives new substances like Carbon Dioxide, Carbon soot, water vapour, heat and light.
Cooking of food, is another example where both physical and chemical changes occurs.
आप यह कैसे दिखाएँगे कि दही का जमना एक रासायनिक परिवर्तन है।
दही का जमना एक रासायनिक परिवर्तन है क्योंकि इसमें एक नया पदार्थ (लैक्टिक अम्ल) बनता है जो मूल पदार्थ (वसा और प्रोटीन) यानी दूध से स्वाद में भिन्न होता है। इसके अलावा परिवर्तन अपरिवर्तनीय है (दही को दूध में परिवर्तित नहीं किया जा सकता है)।
समझाइए कि लकड़ी के जलने और उसे छोटे टुकड़ों में काटने को दो भिन्न प्रकार के परिवर्तन क्यों माना जाता है।
लकड़ी जलाना एक रासायनिक परिवर्तन है क्योंकि जलने पर लकड़ी राख (कार्बन), कार्बन डाइऑक्साइड गैस, जल वाष्प, गर्मी और प्रकाश जैसे नए पदार्थों में परिवर्तित हो जाती है। इसके अलावा परिवर्तन अपरिवर्तनीय है।
जबकि छोटे टुकड़ों में लकड़ी काटना एक भौतिक परिवर्तन है क्योंकि लकड़ी की मूल संरचना नहीं बदलती है। कोई नया पदार्थ नहीं बनता है।
कॉपर सल्फेट के क्रिस्टल कैसे बनते हैं, इनका वर्णन कीजिए।
कॉपर सल्फेट के क्रिस्टल निम्नानुसार तैयार किए जाते हैं:
एक बीकर में पानी ले लो और सल्फ्यूरिक अम्ल की कुछ बूँदें डालें।
पानी गर्म करें। जब यह उबलने लगे तो इसमें लगातार कॉपर सल्फेट पाउडर डालें।
संतृप्ति स्तर तक कॉपर सल्फेट पाउडर डालना जारी रखें।
घोल को छान लें और ठंडा होने के लिए छोड़ दें।
हम कुछ घंटों के बाद कॉपर सल्फेट के क्रिस्टल का निरीक्षण कर सकते हैं।
Explain how painting of an iron gate prevents it from rusting.
For rusting, the presence of both oxygen and water (or water vapour) is required. The coat of the paint prevents direct contact of iron with air and oxygen and thus prevents it from rusting.
Explain why rusting of iron objects is faster in coastal areas than in deserts.
For rusting, the presence of both oxygen and moisture (water vapour) is required. In coastal areas the quantity of moisture content in air is high (highly humid) as compared to desert regions (low humid), so the rusting becomes faster in coastal areas.

CBSE NCERT Solutions for Class 7 Science Chapter 6 Physical and Chemical Changes
CBSE NCERT Solutions for Class 7 Science Chapter 6 in PDF free
7 Science chapter 6 answers guide
NCERT Solutions for Class 7 Science अध्याय 6: भौतिक एवं रासायनिक परिवर्तन
7th science chapter 6 solutions
7 science answers ch. 6
chapter 6 science class 7