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सी.आई.एस.सी.ई.आयसीएसई ICSE Class 8

Define Precipitation . - Chemistry

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प्रश्न

Define precipitation.

व्याख्या
एका वाक्यात उत्तर

उत्तर

 Precipitation: A chemical reaction in which two compounds in their aqueous state react to form an insoluble salt as one of the product.
Acid + Base → Salt + Water
Example.
\[\ce{\underset{\text{Barium chloride}}{BaCl2 (aq)} + \underset{\text{Sodium sulphate}}{Na2SO4 (aq)} -> \underset{\text{Barium sulphate white ppt}}{BaSO4^-}+ \underset{\text{sodium chloride}}{2NaCl (aq)}}\]

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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 3.1 | पृष्ठ ८६

संबंधित प्रश्‍न

When carbon dioxide is passed through lime water, it turns milky due to the formation of ______.


The gas we use in the kitchen is called liquefied petroleum gas (LPG). In the cylinder, it exists as a liquid. When it comes out from the cylinder it becomes a gas (Change − A), then it burns (Change − B). The following statements pertain to these changes. Choose the correct one.


TRUE \ FALSE

The evolution of a gas during a chemical reaction is shown by an arrow pointing downwards. True or false ?


Name three reducing agents ?


Fill in the blank.

Melting of ice is a _______ change.


Write true or false  :
No new substance is formed during a chemical reaction.


Write true or false :

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


Balancing a chemical equation is based on


Balance the following equation :

Fe + H2O → Fe3O4 + H2


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

NaOH + HCl → NaCl + H2O


Reactants Products Type of chemical reaction
BaCl2(aq) + ZnSO4(aq) H2CO3(aq) Displacement
2AgCl(s) FeSO4(aq) + Cu(s) Combination
CuSO4(aq) + Fe(s) BaSO4↓ + ZnCl2(aq) Decomposition
H2O(l) + CO2(g) 2Ag(s) + Cl2(g) Double displacement

Choose the correct option from the bracket and explain the statement giving reason.
(Oxidation, displacement, electrolysis, reduction, zinc, copper, double displacement, decomposition) 

The conversion of ferrous sulphate to ferric sulphate is ______ reaction. 


Give reason for the following:

Molybdenum is used in the manufacture of ammonia.


What do you observe? When

Sodium chloride solution is added to silver nitrate solution.


Complete and balance the following reaction:

NaCl(aq) + AgNO3(aq) →


Name: Two carbonates do not produce carbon dioxide on heating.


What do you observe when HCI is passed through a silver nitrate solution.


Give a chemical test to distinguish between the following gases. 

HCl and Cl2


Give a chemical test to distinguish between the following gases. 

SO2 and Cl2 


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

Ammonium dichromate.


Select the correct answer for the following options:

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


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


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

Zinc carbonate.


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


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


If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust.

Do you think the formation of rust from iron is a chemical change?


Photosynthesis is a chemical charge. Justify your answer.


______ is the chemical name of slaked lime.


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