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सी.आई.एस.सी.ई.आयसीएसई ICSE Class 8

Fill in the Blank A Catalyst Either ................Or ............... The Rate of a Chemical Change but Itself Remains ............... At the End of the Reaction. - Chemistry

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प्रश्न

Fill in the blank

 A catalyst either ................or ............... the rate of a chemical change but itself remains ............... at the end of the reaction.

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उत्तर

A catalyst either increases or decreases the rate of a chemical change but itself remains unchanged at the end of the reaction.

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पाठ 6: Chemical Reactions - Exercise 2 [पृष्ठ ८५]

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सेलिना Concise Chemistry [English] Class 8 ICSE
पाठ 6 Chemical Reactions
Exercise 2 | Q 1.08 | पृष्ठ ८५

संबंधित प्रश्‍न

MULTIPLE CHOICE QUESTIONS

Tick the most appropriate answer.

Compounds, which in their molten state allow an electric current to pass through them are called

  1. electrolytes
  2. non-electrolytes
  3. non-conductors
  4. none of these

Fill in the blank

A new substance is always formed in a _______ change.


True or false 

New substances are formed in a chemical change.


Fill in the blank:
The substances formed as a result of a chemical reaction are called _______


Multiple choice:

Thermal decomposition of sodium carbonate will produce


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


Complete and balance the following reaction:

\[\ce{CuCO3 ->[\Delta]}\]


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


Name: Gas with rotten egg smell. 


Give a chemical test to distinguish between the following gases. 

HCl and Cl2


Distinguish by heating the following in dry test tubs.

Zinc carbonate, Copper carbonate and lead carbonate.


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


Give reason for the following:

Even though rusting is an exothermic reaction, the heat evolved when an iron nail rusts is unnoticeable.


Name the following:

The type of change physical or chemical involved – ‘during respiration in human beings’.


Give balanced equation for the following conversion affected by heat alone on the substance:

Copper nitrate to nitrogen dioxide


Give balanced equation for the following conversion affected by heat alone on the substance:

Ammonium dichromate to nitrogen


Explain the following statement: Digestion is a chemical change.


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


Define the following term:

Chemical change


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