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प्रश्न
Fill in the blank.
Melting of ice is a _______ change.
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उत्तर
Melting of ice is a physical change.
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संबंधित प्रश्न
Changes in which new substances are formed are called ______ changes.
TRUE \ FALSE
The evolution of a gas during a chemical reaction is shown by an arrow pointing downwards. True or false ?
Fill in the blank:
The substances formed as a result of a chemical reaction are called _______
Explain the following reaction with one suitable example of Decomposition reaction
Explain the following reaction with one suitable example of Double decomposition reaction.
Give an example of a photochemical reaction.
Name affects the acidified K2Cr2O7 paper and also turns lime water dirty milky.
Name: Gas with rotten egg smell.
Write your observation and a balanced equation in the case of the following substances being heated.
Zinc carbonate.
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.
An exothermic reaction where both the reactants are gases, one of which is oxygen.
Complete the table given below.
| Heat on iodine crystals | Colour of vapours evolved |
State the following reaction represent oxidation or reduction.
\[\ce{Ag->Ag+}\]
Name the solid residual product formed reaction and state its colour during – thermal decomposition of the following substance.
Ammonium dichromate.
Circle the odd one out. Give reason for your choice
Rusting of Iron: undesirable change:: Dead plants turn into manure: ______.
The water we drink is a combination of hydrogen and oxygen.
Heat may evolve or be absorbed during a ______ change.
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 |
______ is the chemical name of limestone.
