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सी.आई.एस.सी.ई.आईसीएसई ICSE Class 7

A Solution of a Substance ‘X’ is Used for White Washing Write the Reaction of the Substance ‘X’ Named in (A) Above with Water. - Chemistry

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प्रश्न

A solution of a substance ‘X’ is used for white washing write the reaction of the substance ‘X’ named in (a) above with water.

एक पंक्ति में उत्तर

उत्तर

\[\ce{\underset{\text{quick lime}}{CaO} + H2O ->\underset{\text{slaked lime}}{Ca(OH)2}}\]

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अध्याय 5: Language of Chemistry - Additional questions

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सेलिना Concise Chemistry [English] Class 7 ICSE
अध्याय 5 Language of Chemistry
Additional questions | Q 10.2

संबंधित प्रश्न

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


 Fill in the blank.
 The formation of gas bubbles in a liquid during a reaction is called ......................


MULTIPLE CHOICE QUESTIONS

Tick the most appropriate answer.

 

Miscible liquids having slightly different boiling points can be separated by the

  1. evaporation
  2. distillation
  3. fractional distillation
  4. sedimentation

Write a short note on the information derived from a balanced chemical equation.


Fill in the blank.

Melting of ice is a _______ change.


True or false 

New substances are formed in a chemical change.


 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.


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


Give an example of the following chemical change.

Two solids combine to form a liquid


Multiple choice:

A reaction of a type: AB + CD → AD + CD, involves


Name the gases which Turn moist red litmus blue.


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

Ammonium dichromate


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

Copper carbonate


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

Zinc carbonate


Distinguish by dilute sulphuric acid.

Sodium sulphide and sodium sulphite?


Select the correct answer for the following options:

The basic gas obtained when two gases react in presence of a catalyst and the reaction is exothermic.


Give a word equation for the following reaction.

Two gases which combine to give a solid.


Give reason for the following:

Electrolytic decomposition of water is a reaction involving change of state.


Name the following:

The type of change physical or chemical involved – ‘during respiration in human beings’.


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 hydrochloric acid to silver nitrate.


Complete the table given below.

Heat on  copper carbonate Test for gas evolved  

A chemical reaction is often accompanied by external indications or characteristics.


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

Ammonium dichromate.


_____ is the basic material to manufacture urea.


Which of the following is not an “element + element → compound” type reaction?


A thick coating of a paste of Plaster of Paris (POP) is applied over the bandage on a fractured bone. It becomes hard on drying to keep the fractured bone immobilised. Can the change in POP be reversed?


What is the use of indicator?


Beating an egg to make a cake is a ______.


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


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