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

संबंधित प्रश्न

How do the following help in bringing about a chemical change?

catalyst .


Write true or false .
A black residue is formed when sugar is heated .


Choose the correct option from the bracket and explain the statement giving reason.

(Oxidation, displacement, electrolysis, reduction, zinc, copper, double displacement, decomposition)

To prevent rusting, a layer of ______ metal is applied on iron sheets.


Explain by writing a word equation.

Bubbles are seen on adding lemon juice to baking soda.


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. 


Write the chemical reaction where the following changes are observed.

Colour change is noticed


Write the chemical reaction where the following changes are observed.

Physical state is changed


Give a chemical test to distinguish between the following gases. 

HCl and H2S


Give a chemical test to distinguish between the following gases. 

HCl and Cl2


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 compound which on heating shows – colour change from brown to yellow.


What is a chemical reaction?


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 water to quicklime.


State the following reaction represent oxidation or reduction.

\[\ce{Fe++->Fe+++}\]


Give a suitable example with an equation to show the representation of a chemical reaction.


What is the use of indicator?


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.

______ occurs in the absence of air and in the presence of micro-organisms such as yeast.


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


When carbon dioxide is passed through lime water ______.


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