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प्रश्न
Write the chemical reaction where the following changes are observed.
Colour change is noticed
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उत्तर
\[\ce{Fe + \underset{\text{Blue solution}}{CuSO4_(_a_q_)} ->\underset{\text{Green solution}}{FeSO4 + Cu}}\]
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संबंधित प्रश्न
Changes in which new substances are formed are called ______ changes.
Complete and balance the following chemical equations
NaCI + `AgNO_3` `→`
Classify the following reaction as combination, decomposition, displacement, precipitation and neutralization. Also balance the equation.
\[\ce{NH3_{(g)} + HCl_{(g)} -> NH4Cl_{(s)}}\]
What do you observe when iron nail is kept in copper sulphate solution for sometime.
Fill in the blank
A change in which the substance can be brought back to its original state is called a _______ change.
Write the chemical reaction where the following changes are observed.
Precipitate is formed
State the original colour of the following substance and colour of residue obtained after heating.
Ammonium dichromate
Give examples of exothermic reactions i.e. heat evolved in each of the following:
(a) reaction between a solid and a liquid
(b) reaction between two gases
Give two examples of exothermic reactions seen in everyday life.
Give a word equation for the following reaction.
An exothermic reaction where both the reactants are gases, one of which is oxygen.
Give balanced equation for the following conversion affected by heat alone on the substance:
Hydrated copper sulphate to sulphur dioxide
