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सी.आई.एस.सी.ई.आईसीएसई 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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अध्याय 6: Chemical Reactions - Exercise 2 [पृष्ठ ८६]

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

संबंधित प्रश्न

Changes in which new substances are formed are called ______ changes.


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


Complete and balance the following chemical equations:

`"H"_2"S"` + `"CI"_2`  `→`  


Write the missing reactants and products and balance the equations.

NaOH + ............... `→` NaCI + ...................


Give a reason.

Wasp sting is treated with vinegar.


FILL IN THE BLANK

In a double decomposition precipitation reaction both the reactants must be ............ soluble.


Write true or false :

When potassium iodide solution is added to lead acetate solution a red precipitate is formed.


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

NaOH + HCl → NaCl + H2O


Explain by writing a word equation.

Limestone powder disappears on adding to dilute hydrochloric acids.


Give an example of a reaction where the following are involved

Catalyst


Define an electrochemical reaction.


Write the chemical reaction where the following changes are observed.

Colour change is noticed


Name: Two carbonates do not produce carbon dioxide on heating.


State the original colour of the following substance and colour of residue obtained after heating.

Zinc carbonate


Give reason for the following:

Even though rusting is an exothermic reaction, the heat evolved when an iron nail rusts is unnoticeable.


Give reason for the following:

Electrolytic decomposition of water is a reaction involving change of state.


Give two examples where a chemical reaction is accompanied by a change in colour of the reactants and products on completion of the reaction.


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


Assertion: The formation of iron oxide from iron is a chemical change.

Reason: For the rust to form from iron, it must be exposed to air and water.


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