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सी.आई.एस.सी.ई.आयसीएसई ICSE Class 7

State Four Conditions Necessary for Chemical Reactions to Take Place.

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प्रश्न

State four conditions necessary for chemical reactions to take place.

एका वाक्यात उत्तर
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उत्तर

Conditions necessary for chemical reactions :

  1. Close contact
  2. Solution form
  3. Heat
  4. Light
  5. Catalyst
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पाठ 5: Language of Chemistry - Exercise

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एस.पी. सिंह Concise Chemistry [English] Class 7 ICSE
पाठ 5 Language of Chemistry
Exercise | Q 2

संबंधित प्रश्‍न

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

pressure.


Give reason .

A person suffering from acidity is advised to take an antacid.


TRUE \ FALSE

A precipitation reaction takes place only in a solution.


TRUE \ FALSE

The evolution of a gas during a chemical reaction is shown by an arrow pointing downwards. True or false ?


Write a short note on the information derived from a balanced chemical equation.


Fill in the blank:

In some chemical reactions an insoluble ________ is formed when two solutions are mixed.


Write true or false  :
No new substance is formed during a chemical reaction.


Match the column in the following table.

Reactants Products Type of chemical reaction
BaCl2(aq) + ZnSO4(aq) H2CO3(aq) Displacement
2AgCl(s) FeSO4(aq) + Cu(s) Combination
CuSO4(aq) + Fe(s) BaSO4↓ + ZnCl2(aq) Decomposition
H2O(l) + CO2(g) 2Ag(s) + Cl2(g) Double displacement

Explain by writing a word equation.

Respiration is a chemical change. 


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

Hydrogen chloride


Choose the correct option from the bracket and explain the statement giving a reason.

(Oxidation, displacement, electrolysis, reduction, zinc, copper, double displacement, decomposition) 

Addition of an aqueous solution of ZnSO4 to an aqueous solution of BaCl2 is an example of ______ reaction.


What is a chemical reaction?


Give an example of the following chemical changes.

A reaction where colour change is noticed.


Give a chemical test to distinguish between the following gases. 

SO2 and Cl2 


Give a word equation for the following reaction.

A salt which reacts with ammonium hydroxide to give a reddish brown precipitate.


Complete the table given below.

Addition of dil. H2SO4 to FeS  Odour of gas evolved  

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


Give a balanced equation for the conversion of a soluble lead salt to an insoluble lead salt – formed as a white precipitate.


Analogy:

H2O: Water:: NaCl: ______.


Photosynthesis is a chemical charge. Justify your answer.


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