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सी.आई.एस.सी.ई.आयसीएसई ICSE Class 7

Explain the Following Reaction with One Suitable Example Of Decomposition Reaction

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प्रश्न

Explain the following reaction with one suitable example of Decomposition reaction

एका वाक्यात उत्तर
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उत्तर

Decomposition reaction : In this reaction a substance breaks up on heating to form two or more simpler substances, e.g. Electrolysis of water.

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पाठ 5: Language of Chemistry - Additional questions

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एस.पी. सिंह Concise Chemistry [English] Class 7 ICSE
पाठ 5 Language of Chemistry
Additional questions | Q 7.2

संबंधित प्रश्‍न

The chemical name of baking soda is ______.


Give reason.

Acidic soil is treated with quick lime.


FILL IN THE BLANK

In a ............ change, new substances are formed.


Explain by writing a word equation.

Bubbles are seen on adding lemon juice to baking soda.


Name: A greenish-yellow gas.


Give a chemical test to distinguish between the following gases. 

HCl and H2S


Give a word equation for the following reaction.

A salt which reacts with ammonium hydroxide to give a reddish brown precipitate.


Name the following:

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


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.


Explain the Silver nitrate solution is kept in coloured reagent bottles in the laboratory.


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


Give a balanced equation for the conversion of a soluble lead salt to an insoluble lead salt – formed as a white precipitate.


Name the solid residual product formed reaction and state its colour during – thermal decomposition of the following substance.

Lead nitrate.


Circle the odd one out. Give reason for your choice


Burning of paper is a ______ change.


_____ is the basic material to manufacture urea.


What is the role of a catalyst in a chemical reaction?


When magnesium is burnt in the air, a new substance is formed which is ______.


Write a note on the following:

Fermentation


Why is spoiling food a chemical change?


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