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सी.आई.एस.सी.ई.आईसीएसई ICSE Class 8

Complete and Balance the Following Chemical Equations:

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प्रश्न

Complete and balance the following chemical equations:

Zn + `"H"_2"SO"_4`  `→`

           (dil)

एक पंक्ति में उत्तर
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उत्तर

Zn + `"H"_2"SO"_4`  `→`  Zn `"SO"_4`  + `"H"_2` 

           (dil)

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अध्याय 6: Chemical Reactions - Exercise 1 [पृष्ठ ७३]

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सेलिना Concise Chemistry [English] Class 8 ICSE
अध्याय 6 Chemical Reactions
Exercise 1 | Q 6.5 | पृष्ठ ७३

संबंधित प्रश्न

When baking soda is mixed with lemon juice, bubbles are formed with the evolution of a gas. What type of change is it? Explain.


What are biocatalysts ?


Write true or false  : 

Hydrogen sulphide has rotten egg smell .


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


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

Water


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. 


Distinguish by heating the following in dry test tubs.

Ammonium Chloride and iodine.


What do you observe when CO2 is passed through lime water first and then a little in excess.


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

Ammonium dichromate.


Explain the term ‘chemical reaction’ with special reference to – ‘reactants’ and ‘products’.


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

Copper nitrate to nitrogen dioxide


Complete the table given below.

Heat on iodine crystals Colour of vapours evolved  

Give a balanced equation for the conversion of an ammonium salt to a basic gas.


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

Copper nitrate.


______ gas causes tears in our eyes while cutting onions.


Silver metal can displace hydrogen gas from nitric acid.


Write some materials prepared by chemical changes.


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.


Classify the following processes into physical or chemical changes:

  1. Beating of aluminium metal to make aluminium foil.
  2. Digestion of food.
  3. Cutting of a log of wood into pieces.
  4. Burning of crackers.

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


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