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सी.आई.एस.सी.ई.आईसीएसई ICSE Class 7

Explain the Following Reaction with One Suitable Example Of Displacement Reaction. - Chemistry

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प्रश्न

Explain the following reaction with one suitable example of Displacement reaction.

एक पंक्ति में उत्तर

उत्तर

Displacement reaction: In this reaction a more reactive element displaces a less reactive element from its compound, e.g. Reaction of iron with copper sulphate.

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अध्याय 5: Language of Chemistry - Additional questions

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सेलिना Concise Chemistry [English] Class 7 ICSE
अध्याय 5 Language of Chemistry
Additional questions | Q 7.3

संबंधित प्रश्न

State whether the following statement is true or false. In case a statement is false, write the corrected statement.

Formation of manure from leaves is a physical change.


The chemical name of baking soda is ______.


How would you show that setting of curd is a chemical change?


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

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


Write true or false :

When iron and sulphur are heated together a grey mass is formed which is attracted by a magnet .


A solution of a substance ‘X’ is used for white washing write the reaction of the substance ‘X’ named in (a) above with water.


Out of sodium and sulphur which is a metal? Explain its reaction with the oxygen.


Complete the statement by filling the gaps using appropriate term from the terms given in the bracket.

(slow, coloured, arrow, fast, smell, milky, physical, product, chemical, reactant, covalent, ionic, octet, duplet, exchange, sharing, equality sign)

Rusting of iron is a ______ chemical change. 


Complete the statement by filling the gaps using appropriate term from the terms given in the bracket.

(slow, coloured, arrow, fast, smell, milky, physical, product, chemical, reactant, covalent, ionic, octet, duplet, exchange, sharing, equality sign)

Electron ______ is complete in each hydrogen in a hydrogen molecule.


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.

Sodium chloride


Explain the term reactant and product giving examples. 


Give an example of a reaction where the following are involved

Heat


Give reason for the following:

Colourless concentrated sulphuric acid in a test tube changes to blue on adding a small piece of copper to it.


Multiple choice:

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


What do you observe? When

Sodium chloride solution is added to silver nitrate solution.


Complete and balance the following reaction:

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


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


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

Zinc nitrate to nitrogen dioxide


Complete the table given below.

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\[\ce{H->H+}\]


A chemical reaction is often accompanied by external indications or characteristics.


When lithium metal is placed in hydrochloric acid, _______ gas is evolved.


Chemists identify gypsum as a natural indicator.


On heating calcium carbonate gets converted into calcium oxide and carbon dioxide.

(a) Is this a physical or a chemical change?

(b) Can you prepare one acidic and one basic solution by using the products formed in the above process? If so, write the chemical equation involved.


Classify each of the following, as a physical or a chemical change. Give reasons.

(a) Drying of a shirt in the sun.

(b) Rising of hot air over a radiator.

(c) Burning of kerosene in a lantern.

(d) Change the colour of black tea by adding lemon juice to it.

(e) Churning of milk cream to get butter.


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Are these changes chemical in nature?


Write a note on the following:

Fermentation


When milk is mixed with coffee decoction, the colour of milk and decoction changes due to ______.


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