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सी.आई.एस.सी.ई.आईसीएसई ICSE Class 7

Balance the Following Equation : Fe + H2o → Fe3o4 + H2 - Chemistry

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प्रश्न

Balance the following equation :

Fe + H2O → Fe3O4 + H2

एक पंक्ति में उत्तर
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उत्तर

3 Fe + 4H2O → Fe3O4 + 4H2

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अध्याय 5: Language of Chemistry - Additional questions

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सेलिना Concise Chemistry [English] Class 7 ICSE
अध्याय 5 Language of Chemistry
Additional questions | Q 4.2

संबंधित प्रश्न

TRUE \ FALSE

Positively charged electrode is called the anode. True or false ?


 Fill in the blank

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


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

Fe + CuSO4 → FeSO4 + Cu


A solution of a substance ‘X’ is used for white washing write the reaction of the substance ‘X’ named in (a) above with water.


Show with the help of diagram of electronic configuration how the following compound is formed from the constituent atoms.

Sodium chloride


Define an electrochemical reaction.


Write the chemical reaction where the following changes are observed.

Gas is evolved


Give reason for the following:

Molybdenum is used in the manufacture of ammonia.


When hydrogen burns in oxygen, water is formed; when electricity is passed through water, hydrogen and oxygen are given out. Name the type of chemical change involved in the two cases.


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


Give a chemical test to distinguish between the following gases. 

NH3 and SO2


Distinguish by dilute sulphuric acid.

Copper and magnesium?


State the following reaction represent oxidation or reduction.

\[\ce{H->H+}\]


Complete the statement by filling in the blank with the correct word:

The reddish-brown precipitate obtained during a double decomposition precipitation reaction between an iron salt and alkali is __________.


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

Calcium hydroxide.


Chemical change is a temporary change.


Write five changes in the characteristics of a substance that can take place during a chemical change. 


Write a note on the catalyst.


Write a note on the following:

Curdling of milk


______ is the chemical name of limestone.


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