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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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एस.पी. सिंह Concise Chemistry [English] Class 8 ICSE
पाठ 6 Chemical Reactions
Exercise 2 | Q 10.1 | पृष्ठ ८६

संबंधित प्रश्‍न

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

Iron and rust are the same substances. 


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.


State what you would observe when the following substance is heated in a glass test tube Copper (II) carbonate Red lead .


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

Fe2O3 + 2Al → Al2O3 + 2Fe


Choose the correct option from the bracket and explain the statement giving a reason.

(Oxidation, displacement, electrolysis, reduction, zinc, copper, double displacement, decomposition) 

Addition of an aqueous solution of ZnSO4 to an aqueous solution of BaCl2 is an example of ______ reaction.


Explain the term reactant and product giving examples. 


Give an example of the following chemical change.

A reaction where colour change is noticed


Write the chemical reaction where the following changes are observed.

Physical state is changed


Name affects the acidified K2Cr2O7 paper and also turns lime water dirty milky.


Give a chemical test to distinguish between the following gases. 

NH3 and SO2


A chemical reaction is often accompanied by external indications or characteristics which include – 

  1. Colour change
  2. Effervescence or gas evolved
  3. Evolution or absorption of heat
  4. Formation of a precipitate.

With reference to each of the above indications, state the external indication seen during – Addition of water to quicklime.


Complete the table given below.

Addition of dil. H2SO4 to FeS  Odour of gas evolved  

Give a balanced equation for a reaction involving the evolution of gas on the addition of dilute acid to calcium carbonate.


Explain the following statement: Digestion is a chemical change.


________ is a chemical substance which alters the speed of a chemical reaction.


What is the role of a catalyst in a chemical reaction?


Classify the following as physical or chemical properties

Most metal oxides form alkalis on interacting with water.


Assertion (A): Cutting paper into very small pieces is an irreversible change.
Reason (R): Physical changes are always reversible.


Both CO2 and H2 gases are ______.


Define the following term:

Chemical change


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