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सी.आई.एस.सी.ई.आयसीएसई ICSE Class 7

Copper Carbonate When Heated, It Turns : (A) Blue (B) Green (C) Black (D) Yellow

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प्रश्न

Copper carbonate when heated, it turns :

पर्याय

  • Blue

  • Green

  • Black

  • Yellow

MCQ
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उत्तर

Black.

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पाठ 5: Language of Chemistry - Multiple choice questions

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सेलिना Concise Chemistry [English] Class 7 ICSE
पाठ 5 Language of Chemistry
Multiple choice questions | Q 3

संबंधित प्रश्‍न

State whether the following statement is true or false. In case a statement is false, write the corrected statement.

Iron pipes coated with zinc do not get rusted easily.


What do you observe when iron nail is kept in copper sulphate solution for sometime.


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

NaOH + HCl → NaCl + H2O


Out of sodium and sulphur which is a metal? Explain its reaction with the oxygen.


Explain by writing a word equation.

Hard water gets softened on mixing with a solution of washing soda.


Give an example of the following chemical change.

Two gases combine to form white solid


Give reason for the following:

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


Complete and balance the following reaction:

NaCl(aq) + AgNO3(aq) →


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

Zinc carbonate


Give a chemical test to distinguish between the following gases. 

NH3 and SO2


Select the correct answer for the following options:

The black residue obtained on heating copper carbonate.


Explain the Silver nitrate solution is kept in coloured reagent bottles in the laboratory.


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

Ammonium dichromate.


Assertion: The formation of iron oxide from iron is a chemical change.

Reason: For the rust to form from iron, it must be exposed to air and water.


Discuss how acid rain occurs due to emission of smoke from vehicles and industries?


Write some materials prepared by chemical changes.


______ is a natural indicator.


Classify the following as physical or chemical properties

Zinc dissolves in hydrochloric acid with the evolution of hydrogen gas.


A chemical change may involve –


Which of the following is/are true when milk changes into curd?

  1. Its state is changed from liquid to semi solid.
  2. It changes colour.
  3. It changes taste.
  4. The change cannot be reversed.

Choose the correct option from below:


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