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सी.आई.एस.सी.ई.आयसीएसई ICSE Class 8

Give one example that illustrates the following characteristics of a chemical reaction: Change in state - Chemistry

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प्रश्न

Give one example that illustrates the following characteristics of a chemical reaction:

Change in state

लघु उत्तर
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उत्तर

The reaction between hydrogen sulphide and chlorine (both gases) produces sulphur (solid) and hydrogen chloride (gas).

\[\ce{\underset{Hydrogen sulphide}{H2S_{(g)}} + \underset{Chlorine}{Cl2_{(g)}}-> \underset{Hydrogen chloride}{2HCl_{(g)}} + \underset{(yellow solid)}{\underset{Sulphur}{S_{(s)}}}}\]

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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 2.3 | पृष्ठ ७३

संबंधित प्रश्‍न

Fill in the blank

 A catalyst either ................or ............... the rate of a chemical change but itself remains ............... at the end of the reaction.


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


Fill in the blank

A new substance is always formed in a _______ change.


Fill in the blank:

The basic conditions necessary for a chemical reaction is _______


State what you would observe when the following substance is heated in a glass test tube red lead.


A solution of a substance ‘X’ is used for white washing Name the substance ‘X’ and write its formula.


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

Explain by writing a word equation.

Respiration is a chemical change. 


Match the pairs.

a. Photosynthesis i.  Tendency to lose electrons
b. Water ii.  Reactant in combustion process
c. Sodium chloride iii.  Chemical change
d. Dissolution of salt in water  iv.  Covalent bond
e. Carbon v.  Ionic bond
f. Fluorine vi.  Physical change 
g. Magnesium vii.  Tendency to form anion

Give an example of a reaction where the following are involved

Electricity


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

Ammonium dichromate


State the following reaction represent oxidation or reduction.

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


Explain the term chemical reaction with special reference to reactants and products.


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

Zinc carbonate.


True or False. If false, give the correct answer.

Taking a glass of water and freezing it by placing it in the freezer is a chemical change.


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.


Write some materials prepared by chemical changes.


The chemical name of baking soda is sodium bicarbonate.


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


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