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सी.आई.एस.सी.ई.आईसीएसई ICSE Class 8

Match the chemical reactions in List I with the appropriate answer in List II. List I List II 1. XY⇌heatX+Y A: Displacement reaction 2. XY⟶X+Y B: Double decomposition 3. XA+YA−+AA+BA−⟶XA+BA−+AA+YA− C

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प्रश्न

Match the chemical reactions in List I with the appropriate answer in List II.

  List I   List II
1. \[\ce{XY⇌[heat]X + Y}\] A: Displacement reaction
2. \[\ce{XY->X + Y}\] B: Double decomposition
3. \[\ce{X+Y- + A+B^-->X+B- + A+Y-}\] C: Endothermic reaction
4. \[\ce{X + YZ->XZ + Y}\] D: Thermal dissociation
5. \[\ce{X + Y->[heat]XY -\Delta}\] E: Decomposition reaction
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उत्तर

  List I   List II
1. \[\ce{XY⇌[heat]X + Y}\] D: Thermal dissociation
2. \[\ce{XY->X + Y}\] E: Decomposition reaction
3. \[\ce{X+Y- + A+B^-->X+B- + A+Y-}\] B: Double decomposition
4. \[\ce{X + YZ->XZ + Y}\] A: Displacement reaction
5. \[\ce{X + Y->[heat]XY - \Delta}\] C: Endothermic reaction
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अध्याय 6: Chemical Reactions - Objective type questions

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विराफ जे दलाल Simplified Middle School Chemistry [English] Class 8 ICSE
अध्याय 6 Chemical Reactions
Objective type questions | Q 5

संबंधित प्रश्न

The chemical name of baking soda is ______.


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

pressure.


Complete and balance the following chemical equations

NaCI + `AgNO_3`  `→`


MULTIPLE CHOICE QUESTIONS

Tick the most appropriate answer.

Reduction reaction is the exact opposite of

  1. displacement reaction
  2. decomposition reaction
  3. oxidation reaction
  4. none of these

Fill in the blank:

The basic conditions necessary for a chemical reaction is _______


Write true or false  : 

Hydrogen sulphide has rotten egg smell .


When hydrogen burns in oxygen, water is formed; when electricity is passed through water, hydrogen and oxygen are given out. Name the type of chemical change involved in the two cases.


Write your observation and a balanced equation in the case of the following substances being heated.

Ammonium chloride 


Distinguish by dilute sulphuric acid.

Copper and magnesium?


Give a word equation for the following reaction.

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


Give reason for the following:

A characteristic change of colour is seen when a piece of iron is added to copper [II] sulphate solution.


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

Hydrated copper sulphate to sulphur dioxide


Select the correct answer from the options given below:

State the gaseous product formed, when

An active metal reacts with dilute sulphuric acid.


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

Lead nitrate.


What kind of a change is associated with decaying of a plants?


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.


The percentage composition of Nitrogen in Ureas is ______.


Give two examples for the following case:

Chemical changes


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