Advertisements
Advertisements
Question
State the following reaction represent oxidation or reduction.
\[\ce{Fe++->Fe+++}\]
Options
oxidation
reduction
Solution
oxidation
\[\ce{Fe++->Fe+++}\] [∵ loss of electron]
RELATED QUESTIONS
Define catalyst.
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 |
Balance the following equation :
Fe + H2O → Fe3O4 + H2
Give an example of a reaction where the following are involved
Catalyst
Give a chemical test to distinguish between the following gases.
H2 and CO2
Distinguish by heating the following in dry test tubs.
Zinc nitrate and copper nitrate.
Write your observation and a balanced equation in the case of the following substances being heated.
Ammonium chloride
Complete the table given below.
| Heat on Zinc nitrate | Colour of residue |
Complete the table given below.
| Flame test for calcium chloride | Acid used for flame test |
State whether the following reaction is oxidation or reduction.
\[\ce{Na->Na+}\]
Give a balanced equation for the conversion of an ammonium salt to a basic gas.
______ gas causes tears in our eyes while cutting onions.
Which of the following is not an “element + element → compound” type reaction?
On heating calcium carbonate gets converted into calcium oxide and carbon dioxide.
(a) Is this a physical or a chemical change?
(b) Can you prepare one acidic and one basic solution by using the products formed in the above process? If so, write the chemical equation involved.
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?
A student took a solution of copper sulphate in a beaker and put a clean iron nail into it and left it for about an hour.
Write a word equation for the chemical change, if any.
The simplest method of preventing rusting of iron is to coat it with oil, grease, or paint. The reason being ______.
Magnesium + oxygen → magnesium oxide.
2Mg + O2 → 2Mg O
Is the conversion of milk into ice cream a chemical change?
Both CO2 and H2 gases are ______.
