Chemistry
Select the correct answer from the words in bracket
- Hard and soft water can be distinguished using …………… [dil. acid / ordinary soap / detergent].
- Household detergents contain mainly …………… [carbonates/phosphates] and pollute water bodies.
- The type of water softened by addition of washing soda is …………… [permanent / temporary / both types].
- Unpolluted water has …………… [high/low] amount of dissolved oxygen.
- The sample of hard water which lathers with soap after boiling and filtration contains …………… [calcium chloride / calcium bicarbonate]
Practical Chemistry
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Answer
- Hard and soft water can be distinguished using ordinary soap.
- Household detergents contain mainly phosphates and pollute water bodies.
- The type of water softened by addition of washing soda is both types.
- Unpolluted water has high amount of dissolved oxygen.
- The sample of hard water which lathers with soap after boiling and filtration contains calcium bicarbonate.
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Related Questions
Select the correct gas from A to F which matches with the description 1 to 5.
A: CO2
B: SO2
C: NH3
D: Water vapour
E: Cl2
F: H2S- Turns moist blue litmus red and then bleaches it.
- Turns moist red litmus paper blue.
- Turns lime water milky and blue litmus paper slightly pink.
- Turns cobalt chloride paper from blue to pink.
- Turns lead acetate paper from white to silvery black.
Select the correct salt from list II which on thermal decomposition exhibits the change in colour from list I - 1 to 5
List I List II 1. Light green to black A: Copper carbonate 2. White to yellow [heated state] B: Hydrated copper sulphate 3. Blue to black C: Copper nitrate 4. Orange to green D: Ammonium dichromate 5. Blue to white E: Zinc nitrate State which of the substances given below evolves oxygen gas on thermal decomposition.
- Zinc carbonate
- Washing Soda
- Lead nitrate
- Ammonium dichromate
- Trilead tetroxide
- Zinc nitrate
- Mercury [II] oxide
- Anhydrous copper sulphate
Complete the table given below:
Sl.
No.Column 1 Column 2 Column 3 1. Heat on copper nitrate Colour of acidic gas evolved …………… 2. Heat on iodine crystals Colours of vapours evolved …………… 3. Heat on ammonium dichromate Name of neutral gas evolved …………… 4. Heat on copper carbonate Test for gas evolved …………… 5. Heat on zinc nitrate Colour of residue …………… 6. Addition of dil. H2SO4 to FeS Odour of gas evolved …………… 7. Addition of dil. H2SO4 to KHCO3 Name of residue obtained …………… 8. Addition of H2SO4 to zinc Test for gas evolved …………… 9. Heat on sodium chloride Colour imparted to flame dring flame test. 10. Flame test for calcium chloride Acid used for flame test ……………