Advertisements
Advertisements
प्रश्न
Define precipitation reaction.
Advertisements
उत्तर
A chemical reaction in which two compounds in their aqueous state react to form an insoluble salt as one of the products.
APPEARS IN
संबंधित प्रश्न
Write the missing reactants and products and balance the equations.
................+ HCI `→` NaCI + `"H"_2"O"` + .........................
Give reason .
A person suffering from acidity is advised to take an antacid.
FILL IN THE BLANK
Positively charged ions are called ........
FILL IN THE BLANK
Distillation is a method of obtaining pure ............. from a solution.
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 |
Define a photochemical reaction.
Give an example of the following chemical change.
A reaction where colour change is noticed
Complete and balance the following reaction:
Pb(NO3)2 + KI →
Give a chemical test to distinguish between the following gases.
NH3 and HCl
Distinguish by heating the following in dry test tubs.
Zinc carbonate, Copper carbonate and lead carbonate.
Write your observation and a balanced equation in the case of the following substances being heated.
Copper nitrate.
Complete the table given below.
| Addition of dil. H2SO4 to KHCO3 | Name of residue obtained |
State the following reaction represent oxidation or reduction.
\[\ce{H->H+}\]
Complete the statement by filling in the blank with the correct word:
The reddish-brown precipitate obtained during a double decomposition precipitation reaction between an iron salt and alkali is __________.
Analogy:
H2O: Water:: NaCl: ______.
______ is a natural indicator.
Classify the following as physical or chemical properties
Most metal oxides form alkalis on interacting with water.
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 formation of rust from iron is a chemical change?
Heat may evolve or be absorbed during a ______ change.
How would you show that the settling of curd is a chemical change?
