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सी.आई.एस.सी.ई.आयसीएसई ICSE Class 8

What Are Oxides ?

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प्रश्न

What are oxides ? 

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उत्तर

An oxide is a compound which essentially contains oxygen in its molecule, chemically combined with a metal or a non-metal

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पाठ 6: Chemical Reactions - Exercise 2 [पृष्ठ ८६]

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सेलिना Concise Chemistry [English] Class 8 ICSE
पाठ 6 Chemical Reactions
Exercise 2 | Q 10.1 | पृष्ठ ८६

संबंधित प्रश्‍न

Define catalyst.


Fill in the blank

 A catalyst either ................or ............... the rate of a chemical change but itself remains ............... at the end of the reaction.


What are biocatalysts ?


State four conditions necessary for chemical reactions to take place.


Give an example of the following chemical change.

A reaction where colour change is noticed


What do you understand by precipitation reaction? Explain with examples.


Complete and balance the following reaction:

Pb(NO3)2 + KI →


What do you observe when dilute sulphuric acid is added to the following:

Sodium Sulphide


Name the following:

The type of change physical or chemical involved – ‘during respiration in human beings’.


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

Zinc nitrate to nitrogen dioxide


Name the solid residual product formed reaction and state its colour during – thermal decomposition of the following substance.

Lead nitrate.


NPK are the primary nutrients for plants.


Explain the following statement: Digestion is a chemical change.


Silver articles turning black: ______:: Boiling of H2O: physical change ______.


Burning of paper is the best example of ______ change.


Water boiling into water vapour is an example of chemical change.


Rusting of iron is  ______.


______ are substances that speed up the process of a chemical change and it will not undergo any change during the course of the reaction.


Write the characteristics of chemical change.


______ is the chemical name of rust.


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