Q39.Permanent hardness in water cannot be cured by: (1) Treatment with washing soda (2) Ion exchange method (3) Calgon's method (4) Boiling
What This Question Tests
This question tests the knowledge about the different types of water hardness and the specific methods used for their removal, particularly identifying what does not cure permanent hardness.
Concepts Tested
📚 NCERT Sections This Tests
4.13 — How Is The Variability In Oxidation States Of Transition Metals Different From
Chemistry Class 11 · Chapter 4
4.13 How is the variability in oxidation states of transition metals different from that of the non transition metals? Illustrate with examples.
1.1 — Define The Term Solution. How Many Types Of Solutions Are Formed? Write Briefly
Chemistry Class 11 · Chapter 1
1.1 Define the term solution. How many types of solutions are formed? Write briefly about each type with an example.
1.25 — Amongst The Following Compounds, Identify Which Are Insoluble, Partially
Chemistry Class 11 · Chapter 1
1.25 Amongst the following compounds, identify which are insoluble, partially soluble and highly soluble in water? (i) phenol (ii) toluene (iii) formic acid (iv) ethylene glycol (v) chloroform (vi) pentanol. 1.26 If the density of some lake water is 1.25g mL–1 and contains 92 g of Na+ ions per kg of water, calculate the molarity of Na+ ions in the lake.
📋 Question Details
- Chapter
- Hydrogen
- Topic
- Hardness of water
- Year
- 2015
- Shift
- 10 Apr Online
- Q Number
- Q39
- Type
- Conceptual
- NCERT Ref
- Class 11 Chemistry Ch 9: Hydrogen
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