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सी.आई.एस.सी.ई.आयसीएसई ICSE Class 8

Give Reason. Acidic Soil is Treated with Quick Lime. - Chemistry

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प्रश्न

Give reason.

Acidic soil is treated with quick lime.

उत्तर

If the soil is acidic it can be treated with base like quick lime, to make it neutral.

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पाठ 6: Chemical Reactions - Exercise 2 [पृष्ठ ८६]

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सेलिना Concise Chemistry [English] Class 8 ICSE
पाठ 6 Chemical Reactions
Exercise 2 | Q 8.2 | पृष्ठ ८६

संबंधित प्रश्‍न

Name three biochemical catalysts found in the human body.


What are chemical reactions?


Define chemical reaction.


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


Explain by writing a word equation.

Bubbles are seen on adding lemon juice to baking soda.


Match the pairs.

a. Photosynthesis i.  Tendency to lose electrons
b. Water ii.  Reactant in combustion process
c. Sodium chloride iii.  Chemical change
d. Dissolution of salt in water  iv.  Covalent bond
e. Carbon v.  Ionic bond
f. Fluorine vi.  Physical change 
g. Magnesium vii.  Tendency to form anion

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

Hydrogen chloride


Explain the term reactant and product giving examples. 


Give an example of the following chemical change.

Two gases combine to form white solid


Give an example of the following chemical change.

A reaction where colour change is noticed


Write the chemical reaction where the following changes are observed.

Colour change is noticed


State the type of reactions for the following represent and balance the ones that are not balanced.

NaOH + HCl → NaCl + H2O


Complete and balance the following reaction:

\[\ce{Pb(NO3)2 ->[\Delta]}\]


Give a chemical test to distinguish between the following gases. 

NH3 and SO2


Select the correct answer for the following options:

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


Select the correct answer for the following options:

The pale blue precipitated obtained when copper [II] sulphate reacts with sodium hydroxide.


Give a word equation for the following reaction.

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


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

Zinc nitrate to nitrogen dioxide


Complete the table given below.

Heat on iodine crystals Colour of vapours evolved  

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

Ammonium dichromate.


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

Lead nitrate.


Which of the following is a chemical change?


Which of the following statement is incorrect for a chemical reaction?


Beating an egg to make a cake is a ______.


Write the chemical reaction of baking soda with lemon.


Explain how the painting of an iron gate prevents it from rusting.


Write a note on the catalyst.


Write a note on the following:

Fermentation


Photosynthesis is a chemical charge. Justify your answer.


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