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तमिलनाडु बोर्ड ऑफ सेकेंडरी एज्युकेशनएसएसएलसी (अंग्रेजी माध्यम) कक्षा ८

A chemical reaction is a temporary reaction. - Science

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प्रश्न

A chemical reaction is a temporary reaction.

विकल्प

  • True

  • False

MCQ
सत्य या असत्य

उत्तर

A chemical reaction is a temporary reaction- False.

Correct statement:
A chemical reaction is permanent.

shaalaa.com
Effects of Chemical Changes: Environmental Effects
  क्या इस प्रश्न या उत्तर में कोई त्रुटि है?
अध्याय 10: Changes around us - Exercises [पृष्ठ १११]

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सामाचीर कलवी Science [English] Class 8 TN Board
अध्याय 10 Changes around us
Exercises | Q III. 1. | पृष्ठ १११

संबंधित प्रश्न

Match the following.

Spoilage Decomposition
Ozone Biocatalyst
Tarnishing Oxygen
Yeast Chemical reaction
Calcium oxide Food

What happens when an iron nail is placed in copper sulphate solution?


Explain how food items are spoiled by chemical reactions?


Burning of fossil fuels is responsible for global warming. Justify the statement.


Classify the following day-to-day activities based on chemical reactions by physical contact, solutions of reactants, heat, light, electricity, and catalyst.

  1. Burning of crackers during festivals
  2. Fading of coloured clothes on drying under sunlight.
  3. Cooking of eggs.
  4. Charging of batteries.

Kumar is going to build a house. To purchase the iron rods required for construction, he visited an iron and steel shop nearby. The seller showed him some iron rods which are fresh and good. He also showed him little older iron rods which are brownish in appearance. The price of fresh rods is more than the older ones. The seller also gave some offers to older ones. Kumar’s friend Ramesh advised him not to buy the cheaper rods.

  1. Is Ramesh right in his suggestion?
  2. Could you explain the reason for his suggestion?
  3. What are the values shown by Ramesh?

Explain the environmental effects of chemical reactions?


When a magnesium ribbon is burnt in the air, the ash formed is ______.


Reason out

Ozone is produced naturally in the stratosphere.


An element ‘A’ on exposure to moist air turns reddish-brown and a new compound ‘B’ is formed. The substance ‘A’ and ‘B’ are:


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