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सी.आई.एस.सी.ई.आईसीएसई ICSE Class 8

Complete and Balance the Following Chemical Equations: Fe So_4 + Naoh → (Aq.) (Aq.)

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प्रश्न

Complete and balance the following chemical equations:

Fe `"SO"_4`  + NaOH  `→`

   (aq.)          (aq.)

एक पंक्ति में उत्तर
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उत्तर

\[\ce{\underset{\text{(aq.)}}{FeSO4} +\underset{\text{(aq.)}}{NaOH} -> Fe(OH)2 + Na2SO4}\]

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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 6.6 | पृष्ठ ७३

संबंधित प्रश्न

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


FILL IN THE BLANK

Distillation is a method of obtaining pure ............. from a solution.


What are biocatalysts ?


Explain by writing a word equation.

Bubbles are seen on adding lemon juice to baking soda.


What is a chemical reaction?


Give an example of a reaction where the following are involved

Heat


Write the chemical reaction where the following changes are observed.

Physical state is changed


State the original colour of the following substance and colour of residue obtained after heating.

Ammonium dichromate


Name the following:

The products obtained during ‘photosynthesis’ – which is a chemical change.


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 dilute acid to an active metal.


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.


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

Copper carbonate to copper oxide


Complete the table given below.

Addition of dil. H2SO4 to zinc  Test for gas evolved  

Give a balanced equation for a reaction involving the evolution of gas on the addition of dilute acid to calcium carbonate.


______ is not a chemical change.


Higher order Thinking question

A very hot glass on putting in cold water cracks. What does this change indicate?


________ is a chemical substance which alters the speed of a chemical reaction.


______ is a natural indicator.


Arrange the following statements in correct sequence:

  1. One side is water-loving and other water-hating molecules.
  2. When you agitate the cloth, the dirt is surrounded by many molecules and taken away from the cloth.
  3. The dirt surrounded by the detergent molecules floats in the water making it dirty.
  4. Finally, the cloth is clean.
  5. The detergent molecules have two sides.
  6. Water hating goes and joins with dirt and oil in the cloth while the water-loving joins with the water molecules.

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

Can you change rust back into iron by some simple method?


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