Advertisements
Advertisements
Question
Write scientific reason.
Adding zinc particles to a solution of copper sulphate makes the blue solution colorless.
Advertisements
Solution
- 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
RELATED QUESTIONS
Write the balanced chemical equation for the following reaction.
\[\ce{Zinc + Silver nitrate -> Zinc nitrate + Silver}\]
Translate the following statement into a chemical equation and then balance the equation:
Barium chloride reacts with zinc sulphate to give zinc chloride and barium sulphate.
Balance the following equations:
\[\ce{Al(OH)3 -> Al2O3 + H2O}\]
Balance the following chemical equation:
\[\ce{C + CO2 -> CO}\]
Give one example of an endothermic reaction.
When metal X is treated with a dilute acid Y, then a gas Z is evolved which burns readily by making a little explosion.
- Name any two metals which can behave like metal X.
- Name any two acids which can behave like acid Y.
- Name the gas Z.
- Is the gas Z lighter than or heavier than air?
- Is the reaction between metal X and dilute acid Y exothermic or endothermic?
- By taking a specific example of metal X and dilute acid Y, write a balanced chemical equation for the reaction which takes place. Also indicate physical states of all the reactants and products.
Balance the following chemical equation:
\[\ce{FeSO4 ->[Heat] Fe2O3 + SO2 + SO3}\]
Write your observation for the following chemical reaction and name the product formed :
When manganese dioxide is added to potassium chlorate and heated.
Balance the following equation. Also name the products formed.
`"Mg" + "O"_2 → "MgO"`
The step(s) necessary for determining the percentage of water absorbed by raisins is/are:
What is the valency of :
carbon in CH4
Write word equation for the following molecular equation:
AgN03 + HCI → HNO3 + AgCl ↓
Word equation:
State whether AgCl is soluble or insoluble in HN03.
A chemical reaction is generally accompanied by certain external indications or characteristics. These include – change of – (a) colour (b) state (c) smell (d) evolution of gas (e) formation of precipitate (f) evolution or absorption of heat. With reference to change of colour – state the change in colour seen when the following are heated – zinc carbonate.
Give one example in the case where supplying energy [given below] is necessary for a chemical reaction.
Heat energy
Give word equation for the following chemical reaction and give the names of the product formed.
Zn + 2HC1→ ZnCl2 + H2
Balance the following simple equation:
Zn + NaOH → Na2ZnO2 + H2
Write a balanced equation for the following word equation:
Nitrogen dioxide + Water + Oxygen → Nitric acid
Reema took 5ml of Lead Nitrate solution in a beaker and added approximately 4ml of Potassium Iodide solution to it. What would she observe?
Three beakers labelled as A, B and C each containing 25 mL of water were taken. A small amount of NaOH, anhydrous CuSO4 and NaCl were added to the beakers A, B and C respectively. It was observed that there was an increase in the temperature of the solutions contained in beakers A and B, whereas in case of beaker C, the temperature of the solution falls. Which one of the following statement(s) is(are) correct?
- In beakers A and B, exothermic process has occurred.
- In beakers A and B, endothermic process has occurred.
- In beaker C exothermic process has occurred.
- In beaker C endothermic process has occurred.
