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प्रश्न
Copper carbonate when heated, it turns :
विकल्प
Blue
Green
Black
Yellow
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उत्तर
Black.
APPEARS IN
संबंधित प्रश्न
Name three biochemical catalysts found in the human body.
MULTIPLE CHOICE QUESTIONS
Tick the most appropriate answer.
Reduction is a chemical reaction in which there is
- removal of hydrogen
- removal of oxygen
- addition of oxygen
- none of these
FILL IN THE BLANK
The new substances formed during a chemical reaction are called the ..................
MATCH THE COLUMNS
| 1 . `H_2` + `CI_2` `→` 2HCI | a. displacement reaction |
| 2. `2FeCI_3`+ `H_2` `→` `2FeCI_2` +2HCI` | b. addition of an electronegative redical |
| 3. Fe + `CuSO_4` `→``FeSO_4` +Cu` | c. removal of an electronegative redical |
| 4. `2H_2O` +`4NO_2`+`O_2` `→` `4HNO_3` | d.reduction by adding hydrogen |
| 5. 3Fe +`3CI_2` `→` `2FeCI_3` | e.electrolysis of water |
| 6. `FeCI_3`+ 3NaOH `→``Fe(OH)_3``↓`+NaCI | F.double decomposition,precipitation reaction |
| 7.`2H_2O` `→` `2H_2``↑`+`O_2` | e. combination or synthesis reaction |
TRUE \ FALSE
Copper can displace iron from iron sulphate.
What are chemical reactions?
Fill in the blank
A change in which the substance can be brought back to its original state is called a _______ change.
Differentiate between in Chemical reaction and chemical equation.
Give an example of the following chemical change.
Two gases combine to form white solid
Give reason for the following:
Silver nitrate solution is kept in coloured bottles.
What do you observe? When
Water is added to the quick lime.
Give a chemical test to distinguish between the following gases.
SO2 and Cl2
Represent the addition of dilute sulphuric acid to zinc by means of a chemical equation. State the function of the arrow between the reactants and products.
Name the following:
The products obtained during ‘photosynthesis’ – which is a chemical change.
Complete the table given below.
| Heat on iodine crystals | Colour of vapours evolved |
State the following reaction represent oxidation or reduction.
\[\ce{Cl- ->Cl}\]
Name the solid residual product formed reaction and state its colour during – thermal decomposition of the following substance.
Ammonium dichromate.
Burning of paper is a ______ change.
Photosynthesis is a chemical reaction that takes place in the presence of ______.
Discuss how acid rain occurs due to emission of smoke from vehicles and industries?
