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प्रश्न
Select the correct answer for the following options:
The pale blue precipitated obtained when copper [II] sulphate reacts with sodium hydroxide.
पर्याय
Hydrogen
Copper [II] oxide
Oxygen
Copper [II] hydroxide
Ammonia
उत्तर
Copper [II] hydroxide
APPEARS IN
संबंधित प्रश्न
What are (i) positive catalysts and (ii) negative catalysts? Support your answer with one example for each of them.
Write the missing reactants and products and balance the equations.
................+ HCI `→` NaCI + `"H"_2"O"` + .........................
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
Ammonia is a good oxidizing agent.
TRUE \ FALSE
The evolution of a gas during a chemical reaction is shown by an arrow pointing downwards. True or false ?
Write true or false :
Hydrogen sulphide has rotten egg smell .
Write true or false .
A black residue is formed when sugar is heated .
Write true or false.
A chemical equation gives only qualitative information of a chemical reaction.
State what you would observe when the following substance is heated in a glass test tube Copper (II) carbonate Red lead .
Choose the correct option from the bracket and explain the statement giving reason.
(Oxidation, displacement, electrolysis, reduction, zinc, copper, double displacement, decomposition)
The conversion of ferrous sulphate to ferric sulphate is ______ reaction.
Define Photochemical reaction
Give an example
Define Electrochemical reaction
Give an example
State the type of reactions for the following represent and balance the ones that are not balanced.
NaOH + HCl → NaCl + H2O
Name: A greenish-yellow gas.
Distinguish by heating the following in dry test tubs.
Zinc carbonate, Copper carbonate and lead carbonate.
Give a word equation for the following reaction.
Two gases which combine to give a solid.
Give balanced equation for the following conversion affected by heat alone on the substance:
Ammonium dichromate to nitrogen
State the following reaction represent oxidation or reduction.
\[\ce{H->H+}\]
Name the solid residual product formed reaction and state its colour during – thermal decomposition of the following substance.
Calcium hydroxide.
What happens when cane sugar is strongly heated? Mention any two changes in it.
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?
The water we drink is a combination of hydrogen and oxygen.
Give two examples for each of the following cases:
Chemical changes.
Give an example of a chemical reaction for each of the following situations:
A change in colour is observed.
When magnesium is burnt in the air, a new substance is formed which is ______.
Write five changes in the characteristics of a substance that can take place during a chemical change.
Chemical changes are important in our day-to-day life. Give examples.
______ is the chemical name of limestone.
