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सी.आई.एस.सी.ई.आईसीएसई ICSE Class 7

Name the Type of Chemical Reaction Shown by the Following Equation: Caco3 → Cao + Co2

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प्रश्न

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

CaCO3 → CaO + CO2

एक पंक्ति में उत्तर
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उत्तर

CaCO3 → CaO + CO => Decomposition reaction

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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 8.1

संबंधित प्रश्न

Complete and balance the following chemical equations:

Ba`"CI"_2`   +  `"H"_2"SO"_4`   `→`

    (aq.)           (aq.)


Name three reducing agents ?


What is the reaction called when oxidation and reduction take place simultaneously? Explain with one example.


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.


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

Potassium fluoride


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

Water


When electric current is passed through acidulated water ______ of water takes place. 


Multiple choice:

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


Give an example of the following chemical changes.

A reaction where colour change is noticed.


Complete the following table and write your observations.

 

Hydrogen sulphide

Ammonia

Sulphur dioxide

Hydrogen chloride

Shake the gas with red litmus solution

       

Shake the gas with blue litmus solution

       

Apply a burning splint to a gas

       

What do you observe when H2S is passed through a lead nitrate solution.


Write your observation and a balanced equation in the case of the following substances being heated.

Ammonium chloride 


Represent the addition of dilute sulphuric acid to zinc by means of a chemical equation. State the function of the arrow between the reactants and products.


A chemical reaction is often accompanied by external indications or characteristics which include – 

  1. Colour change
  2. Effervescence or gas evolved
  3. Evolution or absorption of heat
  4. Formation of a precipitate.

With reference to each of the above indications, state the external indication seen during – Addition of dilute acid to an active metal.


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.


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

Ammonium dichromate to nitrogen


Complete the table given below.

Addition of dil. H2SO4 to zinc  Test for gas evolved  

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


When an aqueous solution of potassium chloride is added to an aqueous solution of silver nitrate, a white precipitate is formed. Give the chemical equation of this reaction.


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.


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