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सी.आई.एस.सी.ई.आयसीएसई ICSE Class 7

Balance the Following Equation : Fe + O2 → Fe3 O4

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प्रश्न

Balance the following equation :

 Fe + O2 → Fe3 O4

एका वाक्यात उत्तर
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उत्तर

3Fe + 2O2 → Fe3O4

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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 4.1

संबंधित प्रश्‍न

Giving examples, state the difference between balanced and unbalanced chemical equations.


The metal M reacts vigorously with water to form a solution S and a gas G. The solution S turns red litmus to blue whereas gas G, which is lighter than air, burns with a pop sound. Metal M has a low melting point and it is used as a coolant in nuclear reactors.

  1. What is metal M?
  2. What is solution S? Is it acidic or alkaline?
  3. What is gas G?
  4. Write a balanced chemical equation for the reaction which takes place when metal M reacts with water.
  5. Is this reaction exothermic or endothermic?

When a mixture of gases X and Y is compressed to 300 atm pressure and then passed over a catalyst consisting of a mixture of zinc oxide and chromium oxide (heated to a temperature of 300°C), then an organic compound Z having the molecular formula CH4O is formed. X is a highly poisonous gas which is formed in appreciable amounts when a fuel burns in a limited supply of air; Y is a gas which can be made by the action of a dilute acid on an active metal; and Z is a liquid organic compound which can react with sodium metal to produce hydrogen gas.

  1. What are X, Y and Z?
  2. Write a balanced chemical equation of the reaction which takes place when X and Y combine to form Z. Indicate the conditions under which the reaction occurs.

Write word equation for the following skeletal equation:

\[\ce{CO + O2 -> CO2}\]


Write your observation for the following chemical reaction and name the product formed :
When ammonium chloride is heated with sodium hydroxide.


Balance the following equation. Also name the product formed. 

FeCI2 + CI2 →  FeCI3


Balance the following equation:

 HNO3 + H2S → NO2 + H2O + S


Choose the correct answer from the options given below.

The formula of sodium carbonate is Na2CO3 and that of calcium hydrogen carbonate is


A student mixes sodium sulphate powder in barium chloride powder. What change would the student observe on mixing the two powders? Justify your answer and explain how he can obtain the desired change.


Give an example of a chemical equation in which two reactants form:

four product


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