Q35.Boiling of hard water is helpful in removing the temporary hardness by converting calcium hydrogen carbonate and magnesium hydrogen carbonate to (1) CaCO3 and Mg (OH)2 (2) CaCO3 and MgCO3 (3) Ca (OH)2 and MgCO3 (4) Ca (OH)2 and Mg (OH)2
What This Question Tests
This question assesses the knowledge of the chemical changes that occur during the boiling of hard water to remove temporary hardness.
Concepts Tested
📚 NCERT Sections This Tests
3.17 — During Nuclear Explosion, One Of The Products Is 90Sr With Half-Life Of
Chemistry Class 11 · Chapter 3
3.17 During nuclear explosion, one of the products is 90Sr with half-life of 28.1 years. If 1mg of 90Sr was absorbed in the bones of a newly born baby instead of calcium, how much of it will remain after 10 years and 60 years if it is not lost metabolically.
7.20 — How Are The Following Conversions Carried Out?
Chemistry Class 12 · Chapter 7
7.20 How are the following conversions carried out? (i) Propene ® Propan-2-ol. (ii) Benzyl chloride ® Benzyl alcohol. (iii) Ethyl magnesium chloride ® Propan-1-ol. (iv) Methyl magnesium bromide ® 2-Methylpropan-2-ol.
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
- 2022
- Shift
- 26 Jun Shift 2
- Q Number
- Q35
- Type
- MCQ
- NCERT Ref
- Class 11 Chemistry Ch 9: Hydrogen
More from this Chapter
Q45.In context with the industrial preparation of hydrogen from water gas (CO + H2), which of the following is the correct statement? (1) CO and H2 are fractionally separated using (2) CO is removed by absorption in aqueous Cu2Cl2 differences in their densities solution (3) H2 is removed through occlusion with Pd (4) CO is oxidised to CO2 with steam in the presence of a catalyst followed by absorption of CO2 in alkali
Q40.Very pure hydrogen (99.9%) can be made by which of the following processes? (1) Reaction of methane with steam (2) Mixing natural hydrocarbons of high molecular weight (3) Electrolysis of water (4) Reaction of salt like hydrides with water
Q37.From the following statements, choose the incorrect statement regarding H2O2 . (1) It has to be kept away from dust. (2) It can act only as an oxidising agent. (3) It decomposes on exposure to light. (4) It has to be stored in plastic or wax-lined glass bottles in the dark.
Q39.Permanent hardness in water cannot be cured by: (1) Treatment with washing soda (2) Ion exchange method (3) Calgon's method (4) Boiling