Advertisements
Advertisements
प्रश्न
Write scientific reason.
Adding zinc particles to a solution of copper sulphate makes the blue solution colorless.
Advertisements
उत्तर
- Zinc is more reactive than copper.
- Therefore, zinc displaces copper from copper sulphate solution.
\[\ce{\underset{\text{sulphate}}{\underset{\text{Copper}}{CuSO_{4(aq)}}} + \underset{\text{Zinc}}{Zn_{(s)}} -> \underset{\text{sulphate}}{\underset{\text{Zinc}}{ZnSO_{4(aq)}}} + \underset{\text{Copper}}{Cu_{(s)}}}\] - The blue colour of copper sulphate solution fades due to the formation of colourless zinc sulphate.
Hence, adding zinc particles to a solution of copper sulphate makes the blue solution colorless.
APPEARS IN
संबंधित प्रश्न
Translate the following statement into a chemical equation and then balance it.
Potassium metal reacts with water to give potassium hydroxide and hydrogen gas.
Write the balanced chemical equation for the following reaction.
\[\ce{Zinc + Silver nitrate -> Zinc nitrate + Silver}\]
On what basis is a chemical equation balanced?
Correct and balance the following equations:
\[\ce{N + H -> NH3}\]
Chemical equations are balanced to satisfy the law of ______.
What are the various ways in which a chemical equation can be made more informative? Give examples to illustrate your answer.
Balance the following chemical equation:
\[\ce{MnO2 + HCl -> MnCl2 + Cl2 + H2O}\]
Potassium chlorate (KClO3) on heating forms potassium chloride and oxygen. Write a balanced equation for this reaction and indicate the evolution of gas.
Rewrite the following information in the form of a balanced chemical equation:
Magnesium burns in carbon dioxide to form magnesium oxide and carbon.
Ammonia reacts with oxygen to form nitrogen and water. Write a balanced chemical equation for this reaction. Add the state symbols for all the reactants and products.
Give one example of an exothermic reaction.
One of the following does not happen during a chemical reaction. This is:
The chemical reaction between quicklime and water is characterised by ______.
When the solution of substance X is added to a solution of potassium iodide, then a yellow solid separates out from the solution.
- What do you think substance X is likely to be?
- Name the substance which the yellow solid consists of.
- Which characteristic of chemical reactions is illustrated by this example?
- Write a balanced chemical equation for the reaction which takes place. Mention the physical states of all the reactants and products involved in the chemical equation.
Name the various types of chemical reactions.
Express the following facts in the form of a balanced chemical equation:
“When a strip of copper metal is placed in a solution of silver nitrate, metallic silver is precipitated and a solution containing copper nitrate is formed”.
Write a balanced chemical equation with state symbols for the following reaction:
Barium chloride solution reacts with sodium sulphate solution to give insoluble barium sulphate and a solution of sodium chloride.
Write your observation for the following chemical reaction and name the product formed :
When ammonium chloride is heated with sodium hydroxide.
Balance the following equation :
Fe + O2 → Fe3 O4
Balance the following equation. Also name the products formed.
\[\ce{Ag + S -> Ag2S}\]
Balance the following equation. Also name the product formed.
`"H"_2 +"CI"_2 → "HCI"`
Balance the following equation. Also name the product formed.
`"Zn" + "HCI" → "ZnCI" _2 + "H"_2`
Balance the following equation. Also name the product formed.
PbCO3 → PbO +CO2
Write your observation and name the product when An aqueous solution of barium chloride is added to dilute sulphuric acid.
What do the following symbol stand for?
2H2
Balance the following equation:
Ca + N2 → Ca3N2
Balance the following equation:
KOH + Cl2 → KCl + KClO + H2O
Balance the following equation:
P + HNO3 → NO2 + H2O + H3PO4
(a) Give only one suitable chemical test to identify the following gases.
- Ammonia
- Sulphur dioxide
- Hydrogen Chloride
- Chlorine
- Carbon Dioxide
- Oxygen
- Hydrogen
(b) Select a basic gas mentioned in Q.1 (a). How is the basic nature suspected?
(c)Select acidic gases from the gases mentioned in Q.1 (a). How is the acidic nature suspected?
(d) State the gas responsible for bleaching action.
(e)Which gas turn blue cobalt chloride paper light pink?
Write word equation for the following molecular equation:
CuCo3 → CuO + CO2 [g]
Word equation:
State the characteristics or indications occurring in the above reaction.
In certain reaction an insoluble solid called precipitate is formed. State the colour and name of the precipitate formed in the following reaction involving addition of:
Copper [II] sulphate to sodium hydroxide.
Representation of the results of a chemical change – is a chemical equation.
For the equation: FeCl3 + 3NH4OH 3NH4Cl + Fe(OH)3 ↓
Answer the following:
Is the equation given above a balanced equation. Give reasons.
Name the following:
The silvery residue obtained on heating mercury [II] oxide.
Balance the following simple equation:
KBr + Cl2 → KCl + Br2
CaCO3 + 2HCl[dil.] → CaCl2 + H2O + CO2 [g]
State the information not conveyed by the above chemical equation.
Underline the compound in the equation given below, it is incorrectly balanced and write the correct balancing for the same.
PbO2 +4HCl → PbCl2 + H2O + Cl2
Complete the given chemical reaction.
\[\ce{CuSO_{4(aq)} + Fe_{(s)} ->}\]______ + ______
What is called thermolysis reactions?
