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सी.आई.एस.सी.ई.आयसीएसई 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

एका वाक्यात उत्तर

उत्तर

3 Fe + 4H2O → Fe3O4 + 4H2

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पाठ 5: Language of Chemistry - Additional questions

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

संबंधित प्रश्‍न

How do the following help in bringing about a chemical change?

pressure.


How do the following help in bringing about a chemical change?

heat. 


Complete and balance the following chemical equations:

Zn + `"H"_2"SO"_4`  `→`

           (dil)


MULTIPLE CHOICE QUESTIONS

Tick the most appropriate answer.

 

Miscible liquids having slightly different boiling points can be separated by the

  1. evaporation
  2. distillation
  3. fractional distillation
  4. sedimentation

FILL IN THE BLANK

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


FILL IN THE BLANK

Positively charged ions are called ........


TRUE \ FALSE

Ammonia is a good oxidizing agent.


How is precipitate formation in a chemical reaction indicated?


Write true or false .
A black residue is formed when sugar is heated .


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

CaCO3 → CaO + CO2


Complete the statement by filling the gaps using appropriate term from the terms given in the bracket.

(slow, coloured, arrow, fast, smell, milky, physical, product, chemical, reactant, covalent, ionic, octet, duplet, exchange, sharing, equality sign)

The spoiling of food is a chemical change which is recognized from the generation of certain ______ due to it.


Multiple choice:

Thermal decomposition of sodium carbonate will produce


What do you observe? When

Sodium chloride solution is added to silver nitrate solution.


State the main characteristics of chemical reactions. Give at least one example in each case.


Complete and balance the following reaction:

\[\ce{NH3 + O2 ->[\Delta]}\]


Give a chemical test to distinguish between the following gases. 

SO2 and Cl2 


Explain the term ‘chemical reaction’ with special reference to – ‘reactants’ and ‘products’.


Select the correct answer for the following options:

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


Give a word equation for the following reaction.

Two solids which combine on heating, to give a liquid.


What is a chemical reaction?


Complete the table given below.

Addition of dil. H2SO4 to zinc  Test for gas evolved  

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


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

Calcium hydroxide.


NPK are the primary nutrients for plants.


______ change results in the change of the substance.


The percentage composition of Nitrogen in Ureas is ______.


Which of the following is a chemical change?


Melting of wax is a change where a solid changes to a liquid state. Give one more such change which you observe in your surroundings


What is thermochemical reactions?


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