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सी.आई.एस.सी.ई.आयसीएसई ICSE Class 7

Explain the Term ‘Chemical Reaction’ with Special Reference to – ‘Reactants’ and ‘Products’. - Chemistry

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प्रश्न

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

एका वाक्यात उत्तर
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उत्तर

A chemical reaction involves the breaking of existing bonds between atoms or groups of atoms of the reactants and leading to formation of new bonds forming new substances called the products.

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पाठ 5: Language of Chemistry - Exercise

संबंधित प्रश्‍न

Classify the following reaction as combination, decomposition, displacement, precipitation and neutralization. Also balance the equation.

\[\ce{NH3_{(g)} + HCl_{(g)} -> NH4Cl_{(s)}}\]


Differentiate between in Chemical reaction and chemical equation.


Write true or false :

When potassium iodide solution is added to lead acetate solution a red precipitate is formed.


Define an electrochemical reaction.


Give reason for the following:

Blue solution of copper sulphate changes to green when a piece of iron is added to this solution.


Multiple choice:

Which of the following is not a characteristic of a chemical change?


Name affects the acidified K2Cr2O7 paper and also turns lime water dirty milky.


Select the correct answer for the following options:

The gas obtained when potassium chlorate is heated in the presence of a catalyst.


Give reason for the following:

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


What is a chemical reaction?


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 coloured substance which leaves a black residue and evolves two gases one of which is acidic and coloured and the other neutral and colourless.


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

Copper carbonate to copper oxide


Complete the table given below.

Heat on sodium chloride Colour imparted to flame during flame test  

Circle the odd one out. Give reason for your choice


Silver metal can displace hydrogen gas from nitric acid.


Classify the following as physical or chemical properties

Most metal oxides form alkalis on interacting with water.


Give an example of a chemical reaction for the following situation:

A change in colour is observed


______ are substances that speed up the process of a chemical change and it will not undergo any change during the course of the reaction.


Galvanization is a process in which ______ is coated as a layer of iron.


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