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सी.आई.एस.सी.ई.आईसीएसई ICSE Class 8

Complete and balance the following chemical equations: N2 + O2 → - Chemistry

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प्रश्न

Complete and balance the following chemical equations:

N2 + O2  →

एक पंक्ति में उत्तर

उत्तर

N2 + O2  → 2NO(g)

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अध्याय 6: Chemical Reactions - Exercise 1 [पृष्ठ ७३]

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सेलिना Concise Chemistry [English] Class 8 ICSE
अध्याय 6 Chemical Reactions
Exercise 1 | Q 6.1 | पृष्ठ ७३

संबंधित प्रश्न

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

heat. 


Fill in the blanK

 A .............is a substance which changes the rate of a chemical reaction without undergoing a chemical change.


Fill in the blank

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


FILL IN THE BLANK

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


FILL IN THE BLANK

On reaction with sulphuric acid solution, barium chloride forms a white precipitate of ........ sulphate.


FILL IN THE BLANK

........... electrolytes dissociate completely in aqueous state and allow large amount of electricity to flow through it.


Define electrolysis.


Write true or false  : 

Hydrogen sulphide has rotten egg smell .


A chemical equation is a statement that describes a chemical change in terms of


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

2Mg + O2 → 2MgO


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

Water


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.


Explain the term reactant and product giving examples. 


What do you understand by precipitation reaction? Explain with examples.


Define:
 Photochemical reaction
Give one example 


Complete and balance the following reaction:

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


What is observed in performing the following :

  Hydrogen Oxygen Carbon dioxide Chlorine
Litmus test        
Apply a burning splint to the gas        
Colour of gas colourless colourless colourless greenish-yellow
Odour of gas        

State the original colour of the following substance and colour of residue obtained after heating.

Lead nitrate


Give a word equation for the following reaction.

A compound which on heating shows – colour change from brown to yellow.


Give reason for the following:

Electrolytic decomposition of water is a reaction involving change of state.


Name the following:

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


On heating which of the following substances i.e. copper carbonate, zinc carbonate, washing soda, copper sulphate, zinc nitrate, copper nitrate, lead nitrate, ammonium chloride and ammonium dichromate – relate to the reaction given below.

A white solid which evolves two colourless gases which on cooling combine and condense on the cooler parts of the test tube.


Photosynthesis is a chemical reaction that takes place in the presence of ______.


A bag of cement lying in the open gets wet due to rain during the night. The next day the sun shines brightly. Do you think the changes, which have occurred in the cement, could be reversed?


Give two examples for each of the following cases:

Chemical changes.


Beating an egg to make a cake is a ______.


Iron and rust are the same substances.


Write the chemical reaction of baking soda with lemon.


What are the chemical reactions that occur in everyday life?


Define the following term:

Chemical change


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