Definitions [2]
Definition: Analysis
Determination of the chemical components in a given sample is called Analysis.
Definition: Precipitate
Precipitation is the process of formation of an insoluble solid when solutions are mixed. The solid thus formed is called precipitate.
Key Points
Key Points: Colours of the Salts and Their Solutions
- Salts of transition elements (Groups 3–12) are usually coloured, while those of representative elements (Groups 1, 2, 13–17) are generally colourless.
- Coloured ions help identify salts; e.g., Cu²⁺ – blue, Fe²⁺ – light green, Fe³⁺ – yellowish brown, Mn²⁺ – pink.
- Precipitation forms insoluble solids (precipitates) when solutions are mixed, especially when metal hydroxides are formed with alkalis.
Important Questions [26]
- State One Relevant Observation for Given Reactions: Action of Sodium Hydroxide Solution on Ferrous Sulfate Solution.
- Name the kind of particles present in sodium hydroxide solution.
- State one relevant observation for the following: To the copper nitrate solution, initially, few drops of sodium hydroxide solution is added and then added in excess.
- Identify the cation in the following case: Sodium hydroxide solution when added to Solution C gives a white precipitate which is insoluble in excess of sodium hydroxide solution.
- Identify the Cations in the Following Case: Naoh Solution, When Added to the Solution (A), Gives a Reddish Brown Precipitate
- Identify the substance underlined, in the following case: Cation that does not form a precipitate with ammonium hydroxide but forms one with sodium hydroxide.
- ______ is a white precipitate that is soluble in excess of Ammonium hydroxide solution.
- State your observations when ammonium hydroxide solution is added drop by drop and then in excess to the following solution: Copper sulphate solution
- Identify the cation in the following case: Ammonium hydroxide solution when added to Solution B gives a white precipitate which does not dissolve in excess of ammonium hydroxide solution.
- Choose the Correct Answer a Chloride Which Forms a Precipitate that is Soluble in Excess of Ammonium Hydroxide Is:
- How Will You Distinguish Between Ammonium Hydroxide and Sodium Hydroxide Using Copper Sulphate Solution?
- Rita was given an unknown salt for identification. She prepared a solution of the salt and divided it into two parts. To the first part of the salt solution she added a few drops.
- The metal hydroxide which reacts with both acids and alkalis to form salt and water is ______.
- Choose the most appropriate answer from the following list of oxides which fit the description. [SO2, SiO2, Al2O3, MgO, CO, Na2O] An amphoteric oxide
- Choose the most appropriate answer from the following list of oxides which fit the description. [SO2, SiO2, Al2O3, MgO, CO, Na2O] A basic oxide.
- Choose the most appropriate answer from the following list of oxides which fit the description. [SO2, SiO2, Al2O3, MgO, CO, Na2O] An oxide which dissolves in water forming an acid
- When a Metallic Oxide is Dissolved in Water, the Solution Formed Has a High Concentration of ____________ Ions
- State one relevant observation for the following. Lead nitrate solution is treated with sodium hydroxide solution drop wise till it is in excess.
- A compound X (having vinegar like smell) when treated with ethanol in the presence of the acid Z, gives a compound Y which has a fruity smell. The reaction is: C2H5OH + X ->[Z] Y + H2O
- Give a chemical test to distinguish between the given pair of chemicals: Lead nitrate solution and zinc nitrate solution.
- State your observation when excess sodium hydroxide is added to calcium nitrate solution
- Match the salts given in Column I with their method of preparation given in Column II. Column I 1 Pb(NO3)2 from PbO 2 MgCl2 from Mg 3 FeCl3 from Fe 4 NaNO3 from NaOH 5 ZnCO3 from ZnSO4
- State your observations when barium chloride solution is mixed with sodium sulphate solution.
- An amphoteric oxide.
- _____________ (Agcl / Pbcl2), a White Precipitate is Soluble in Excess Nh4oh
- Identify the Salts P and Q from the Observations Given Below: on Performing the Flame Test Salt P Produces a Lilac Coloured Flame and Its Solution Gives a White Precipitate with Silver Nitrate Solution, Which is Soluble in Ammonium Hydroxide Solution.
