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सी.आई.एस.सी.ई.आयसीएसई ICSE Class 8

Complete and Balance the Following Chemical Equations: H_2s + Ci_2→ - Chemistry

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प्रश्न

Complete and balance the following chemical equations:

`"H"_2"S"` + `"CI"_2`  `→`  

एका वाक्यात उत्तर

उत्तर

`"H"_2"S"`   + `"CI"_2`  `→`  2HCI + S

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

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सेलिना Concise Chemistry [English] Class 8 ICSE
पाठ 6 Chemical Reactions
Exercise 1 | Q 6.2 | पृष्ठ ७३

संबंधित प्रश्‍न

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


MULTIPLE CHOICE QUESTIONS

Tick the most appropriate answer.

Compounds, which in their molten state allow an electric current to pass through them are called

  1. electrolytes
  2. non-electrolytes
  3. non-conductors
  4. none of these

FILL IN THE BLANK

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


TRUE \ FALSE

Ammonia is a good oxidizing agent.


 Fill in the blank

A change in which the substance can be brought back to its original state is called a _______ change.


 Fill in the blank

A new substance is formed in a _______ change.


Explain the following reaction with one suitable example of Decomposition reaction


Explain by writing a word equation.

Respiration is a chemical change. 


Give reason for the following:

Blue solution of copper sulphate changes to green when a piece of iron is added to this solution.


Multiple choice:

Which of the following is not a characteristic of a chemical change?


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

Ammonium dichromate


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

Zinc carbonate to zinc oxide


State the following reaction represent oxidation or reduction.

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


State the following reaction represent oxidation or reduction.

\[\ce{Cl- ->Cl}\]


State the following reaction represent oxidation or reduction.

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


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


Complete the statement by filling in the blank with the correct word:

The reddish-brown precipitate obtained during a double decomposition precipitation reaction between an iron salt and alkali is __________.


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

Zinc carbonate.


______ gas causes tears in our eyes while cutting onions.


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


Melting of wax is a change where a solid changes to a liquid state. Give one more such change which you observe in your surroundings


Give two examples for each of the following cases:

Chemical changes.


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?


Heat may evolve or be absorbed during a ______ change.


The chemical formula of rust is ______.


Is the conversion of milk into ice cream a chemical change?


Write the chemical reaction of baking soda with lemon.


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


______ is a chemical substance is used in whitewashing.


Collect information about the types of fuels used for cooking in your area. Discuss with your teachers/parents/others which fuels are less polluting and why.


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