ICSE Worksheet for Chapter - 12 Chemistry Practical Class 8

ICSE Worksheet for Chapter - 12 Chemistry Practical Class 8

Worksheets For class 8

Find ICSE  Worksheet for chapter-12 Chemistry Practicals class 8

1. CLASS-8
2. BOARD: ICSE
3. Chemistry Worksheet - 12
4. TOPIC: Chemistry Practicals
5. For other ICSE Worksheet for class 8 Science check out main page of Physics Wallah.

SUMMARY –

• Gases – neutral, acidic, basic, identification of gases – H₂, O₂, H₂O, CO₂, SO₂, Cl₂, HCl, H₂S, NH₃.
• Heating effect on different substances - PbO₂, CuCO₃, ZnCO₃, Na₂CO₃.10H₂O, CuSO₄.5H₂O, NH₄Cl.
• Identification of cations by NaOH and NH₄OH solution – Fe ²⁺ , Fe ³⁺ , Cu ²⁺ , Ca ²⁺ , Zn ²⁺ , Pb ²⁺ .
• Identification of anions :– CO ₃ ^2- , SO ₃ ^2- , S ^2- , SO ₄ ^2- , Cl ^- , NO ₃ ^- .

SECTION -1

1. Identify the nature of the gas (acidic, basic, neutral ) :
   1. Sulphur dioxide
   2. Carbon dioxide
   3. Ammonia
   4. Hydrogen chloride
   5. Water vapour
   6. Oxygen
   7. Hydrogen
   8. Hydrogen sulphide
2. Write the observation and a balanced equation when the following substances are heated.
   1. Lead dioxide.
   2. Copper carbonate.
   3. Zinc carbonate.
   4. Ammonium chloride.
3. Fill in the blanks:
   1. Zinc carbonate on heating leaves a residue which is _________ (white/yellow) when hot.
   2. (sodium/ammonium)________________chloride on heating sublimes.
   3. Sodium ____________ (nitrate, sulphate) reacts with barium chloride to give a white precipitate.
   4. (carbon dioxide ,sulphur dioxide)______________turns lime water milky and K ₂ Cr ₂ O ₇ paper from orange to green.

SECTION-2

1. Identify the following substances :
   1. An alkaline gas A which gives dense white fumes with hydrogen chloride.
   2. Gas C has an offensive smell like rotten eggs.
   3. Gas D is a colourless gas which can be used as a bleaching agent.
2. Name the gas which –
   1. Turns moist starch iodine paper blue black.
   2. Turns lead acetate paper silvery black.
   3. Do not affect the acidified K₂Cr₂O₇ paper but turn lime water milky.
   4. Affects the acidified K₂Cr₂O₇ paper and also turns lime water milky.
3. What would you observe when dil. HCl is added to :
   1. Sodium carbonate
   2. Sodium sulphite
   3. Sodium sulphide
4. Identify the anion present :
   1. Substance + BaCl ₂ gives white ppt. insoluble in dil. HCl and HNO ₃ .
   2. Substance + conc. H ₂ SO ₄ gives dense white fumes with a glass rod dipped in ammonia.
   3. Substance + conc. H ₂ SO ₄ + Cu gives reddish brown fumes which turns KI paper brown.
5. How would you distinguish between the following-
   1. Ferrous sulphate and ferric sulphate
   2. Calcium nitrate and zinc nitrate.
   3. Zinc nitrate and lead nitrate.
6. Give the colour of the precipitate formed:-
   1. Ferrous salt reacts with ammonium hydroxide solution.
   2. Ferric salt reacts with sodium hydroxide solution.
   3. Copper salt reacts with sodium hydroxide solution.
   4. Lead salt reacts with sodium hydroxide solution.