Advertisements
Advertisements
प्रश्न
Give a word equation for the following reaction.
A salt which reacts with ammonium hydroxide to give a reddish brown precipitate.
Advertisements
उत्तर
Ferric chloride + Ammonium hydroxide → Ferric hydroxide (reddish brown precipitate) + Ammonium chloride
\[\ce{FeCl3 + 3NH4OH -> Fe(OH)3↓ + 3NH4Cl}\]
APPEARS IN
संबंधित प्रश्न
What are (i) positive catalysts and (ii) negative catalysts? Support your answer with one example for each of them.
MULTIPLE CHOICE QUESTIONS
Tick the most appropriate answer.
Compounds, which in their molten state allow an electric current to pass through them are called
- electrolytes
- non-electrolytes
- non-conductors
- none of these
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 |
Fill in the blank
A change in which the substance can be brought back to its original state is called a _______ change.
Fill in the blank
A new substance is formed in a _______ change.
Explain the following reaction with one suitable example of Decomposition reaction
Multiple choice:
Thermal decomposition of sodium carbonate will produce
Give an example of the following chemical changes.
A reaction involving
(i) Change of state
(ii) formation of precipitate
Give an example of a photochemical reaction.
Name affects the acidified K2Cr2O7 paper and also turns lime water dirty milky.
Complete the following table and write your observations.
|
Hydrogen sulphide |
Ammonia |
Sulphur dioxide |
Hydrogen chloride |
|
|
Shake the gas with red litmus solution |
||||
|
Shake the gas with blue litmus solution |
||||
|
Apply a burning splint to a gas |
What do you observe when CO2 is passed through lime water first and then a little in excess.
Complete the table given below.
| Heat on Zinc nitrate | Colour of residue |
Explain the Silver nitrate solution is kept in coloured reagent bottles in the laboratory.
State the following reaction represent oxidation or reduction.
\[\ce{Al->Al+++}\]
A chemical reaction is often accompanied by external indications or characteristics.
Circle the odd one out. Give reason for your choice
If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust.
Can you change rust back into iron by some simple method?
______ is the chemical name of rust.
Acid rain is a result of ______.
