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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

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

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.


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Complete and balance the following chemical equations

NaCI + `AgNO_3`  `→`


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Fe `"SO"_4`  + NaOH  `→`

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The new substances formed during a chemical reaction are called the ..................


TRUE \ FALSE

A precipitation reaction takes place only in a solution.


Write true or false.

A chemical equation gives only qualitative information of a chemical reaction.


Give an example of a reaction where the following are involved

Light


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

Close contact


Give an example of a reaction where the following are involved

Pressure


Give reason for the following:

Colourless concentrated sulphuric acid in a test tube changes to blue on adding a small piece of copper to it.


Multiple choice:

Thermal decomposition of sodium carbonate will produce


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


What do you observe when Cl2 is passed through potassium iodide (KI) solution.


Give a chemical test to distinguish between the following gases. 

HCl and Cl2


Give a chemical test to distinguish between the following gases. 

NH3 and SO2


Distinguish by dilute sulphuric acid.

Copper and magnesium?


Give examples of exothermic reactions i.e. heat evolved in each of the following:

(a) reaction between a solid and a liquid
(b) reaction between two gases
Give two examples of exothermic reactions seen in everyday life.


Select the correct answer for the following options:

The pale blue precipitated obtained when copper [II] sulphate reacts with sodium hydroxide.


Name the following:

The products obtained during ‘photosynthesis’ – which is a chemical change.


Complete the table given below.

Addition of dil. H2SO4 to KHCO3  Name of residue obtained  

Complete the table given below.

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State the following reaction represent oxidation or reduction.

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


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Calcium hydroxide.


What happens when cane sugar is strongly heated? Mention any two changes in it.


Burning of paper is a ______ change.


Classify the following as physical or chemical properties

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How can we prevent rusting?


Collect information about the types of fuels used for cooking in your area. Discuss with your teachers/parents/others which fuels are less polluting and why.


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