हिंदी
सी.आई.एस.सी.ई.आईसीएसई ICSE Class 7

Fill in the Blank a Change in Which the Substance Can Be Brought Back to Its Original State is Called a _______ Change.

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प्रश्न

 Fill in the blank

A change in which the substance can be brought back to its original state is called a _______ change.

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उत्तर

A change in which the substance can be brought back to its original state is called a reversible change.

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अध्याय 2: Physical and Chemical Changes - Additional questions 3

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सेलिना Concise Chemistry [English] Class 7 ICSE
अध्याय 2 Physical and Chemical Changes
Additional questions 3 | Q 1

संबंधित प्रश्न

State whether the following statement is true or false. In case a statement is false, write the corrected statement.

Formation of manure from leaves is a physical change.


State whether the following statement is true or false. In case a statement is false, write the corrected statement.

Condensation of steam is not a chemical change.


Define catalyst.


 What are (i) positive catalysts and (ii) negative catalysts? Support your answer with one example for each of them.


How is a strong electrolyte different from a weak electrolyte?


Name the type of chemical reaction shown by the following equation :

Fe2O3 + 2Al → Al2O3 + 2Fe


A solution of a substance ‘X’ is used for white washing Name the substance ‘X’ and write its formula.


What is the reaction called when oxidation and reduction take place simultaneously? Explain with one example.


Complete the statement by filling the gaps using appropriate term from the terms given in the bracket.

(slow, coloured, arrow, fast, smell, milky, physical, product, chemical, reactant, covalent, ionic, octet, duplet, exchange, sharing, equality sign)

The spoiling of food is a chemical change which is recognized from the generation of certain ______ due to it.


Give an example of a reaction where the following are involved:

Close contact


Define an electrochemical reaction.


Distinguish by heating the following in dry test tubs.

Zinc carbonate, Copper carbonate and lead carbonate.


Write your observation and a balanced equation in the case of the following substances being heated.

Copper nitrate. 


Give a word equation for the following reaction.

An exothermic reaction where both the reactants are gases, one of which is oxygen.


Give balanced equation for the following conversion affected by heat alone on the substance:

Hydrated copper sulphate to sulphur dioxide


NPK are the primary nutrients for plants.


Higher order Thinking question

Peeled and unpeeled banana does not look the same. Does that mean peeling banana is a chemical change?


Burning of paper is a ______ change.


Classify the following as physical or chemical properties

Most metal oxides form alkalis on interacting with water.


Photosynthesis is a chemical charge. Justify your answer.


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