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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 - Chemistry

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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
जोड़ियाँ मिलाइएँ

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 New Simplified Middle School Chemistry [English] Class 8
अध्याय 6 Chemical Reactions
Objective type questions | Q 5

संबंधित प्रश्न

Define precipitation.


FILL IN THE BLANK

A .............. change is a temporary change.


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


TRUE \ FALSE

Evaporation of water is a physical change. True or false ?


What do you observe when :

an iron nail is kept in tap water for few days


True or false 

New substances are formed in a chemical change.


 Fill in the blank

A new substance is formed in a _______ change.


Fill in the blank:
The substances which undergo chemical change are called _______


A chemical equation is a statement that describes a chemical change in terms of


Reactants Products Type of chemical reaction
BaCl2(aq) + ZnSO4(aq) H2CO3(aq) Displacement
2AgCl(s) FeSO4(aq) + Cu(s) Combination
CuSO4(aq) + Fe(s) BaSO4↓ + ZnCl2(aq) Decomposition
H2O(l) + CO2(g) 2Ag(s) + Cl2(g) Double displacement

Show with the help of diagram of electronic configuration how the following compound is formed from the constituent atoms.

Water


What do you observe when H2S is passed through a lead nitrate solution.


Select the correct answer for the following options:

The gas which reacts with oxygen to give a neutral liquid.


Give a word equation for the following reaction.

Two solids which combine on heating, to give a liquid.


Give a word equation for the following reaction.

An exothermic reaction where both the reactants are gases, one of which is oxygen.


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.


Select the correct answer from the options given below:

State the gaseous product formed, when

An active metal reacts with dilute sulphuric acid.


Higher order Thinking question

Peeled and unpeeled banana does not look the same. Does that mean peeling banana is a chemical change?


Chemical change is a temporary change.


Rusting of Iron: undesirable change:: Dead plants turn into manure: ______.


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?


A student took a solution of copper sulphate in a beaker and put a clean iron nail into it and left it for about an hour.

Are these changes chemical in nature?


______ occurs in the absence of air and in the presence of micro-organisms such as yeast.


The chemical name of baking soda is sodium bicarbonate.


Match the following:

  Column I   Column II
1. Burning of coal a. Rusting
2. Painting of a surface b. Evaporation
3. Dipping iron in the water c. Chemical change
4. Salt from seawater d. Prevention of rusting

Write the equation for the process of formation of rust.


We are advised to not to play with fireworks. Give reason.


Assertion (A): Cutting paper into very small pieces is an irreversible change.
Reason (R): Physical changes are always reversible.


Both CO2 and H2 gases are ______.


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