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Question
Copper carbonate when heated, it turns :
Options
Blue
Green
Black
Yellow
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Solution
Black.
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RELATED QUESTIONS
FILL IN THE BLANK
Positively charged ions are called ........
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
A precipitation reaction takes place only in a solution.
TRUE \ FALSE
Electrolytic refining is a method in which a thin coating of a metal is done over another metal.
Fill in the blank:
The basic conditions necessary for a chemical reaction is _______
Balance the following equation :
Fe + H2O → Fe3O4 + H2
Match the column in the following table.
| Reactants | Products | Type of chemical reaction |
| BaCl2(aq) + ZnSO4(aq) | H2CO3(aq) | Displacement |
| 2AgCl(s) | FeSO4(aq) + Cu(s) | Combination |
| CuSO4(aq) + Fe(s) | BaSO4↓ + ZnCl2(aq) | Decomposition |
| H2O(l) + CO2(g) | 2Ag(s) + Cl2(g) | Double displacement |
Complete the statement by filling the gaps using appropriate term from the terms given in the bracket.
(slow, coloured, arrow, fast, smell, milky, physical, product, chemical, reactant, covalent, ionic, octet, duplet, exchange, sharing, equality sign)
Oxygen is a ______ in respiration.
Give an example of the following chemical change.
Two solids combine to form a liquid
Give an example of the following chemical changes.
A reaction where colour change is noticed.
Give a chemical test to distinguish between the following gases.
H2 and O2
Distinguish by heating the following in dry test tubs.
Copper Sulphate and copper carbonate
Distinguish by heating the following in dry test tubs.
Ammonium Chloride and iodine.
Distinguish by dilute sulphuric acid.
Sodium sulphide and sodium sulphite?
Select the correct answer for the following options:
The gas which reacts with oxygen to give a neutral liquid.
Give a balanced equation for a reaction involving the evolution of gas on the addition of dilute acid to sodium sulphite.
What kind of a change is associated with decaying of a plants?
When lithium metal is placed in hydrochloric acid, _______ gas is evolved.
A bag of cement lying in the open gets wet due to rain during the night. The next day the sun shines brightly. Do you think the changes, which have occurred in the cement, could be reversed?
Why is spoiling food a chemical change?
