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Class 11 Exam  >  Class 11 Questions  >  Temporary hardness It can be removed in boili... Start Learning for Free
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Temporary hardness It can be removed in boiling by precipitating
  • a)
    CaCO3.Mg(OH)2
  • b)
    Mg(HCO3)2.CaCO3
  • c)
    Mg(HCO3)2Ca(HCO3)2
  • d)
    Ca(HCO3)2.Mg(OH)2
Correct answer is option 'A'. Can you explain this answer?
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Temporary hardness It can be removed in boiling by precipitatinga)CaCO...
CaCO3.Mg(OH)2 can be precipitate out in order to remove temporary hardness.
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Temporary hardness It can be removed in boiling by precipitatinga)CaCO...
Temporary Hardness Removal
Temporary hardness refers to the presence of dissolved calcium bicarbonate (Ca(HCO3)2) and magnesium bicarbonate (Mg(HCO3)2) in water, which can be removed by boiling. When water is heated, the bicarbonates decompose to form insoluble carbonates, which precipitate out.

Correct Answer Explanation
The correct answer is option 'A', CaCO3.Mg(OH)2, because when temporary hardness is removed by boiling, calcium carbonate (CaCO3) and magnesium hydroxide (Mg(OH)2) are formed as precipitates. These insoluble compounds can be easily separated from the water, thereby removing temporary hardness.

Incorrect Options Explanation
- Option 'B', Mg(HCO3)2.CaCO3, is incorrect because it does not represent the compounds formed during the removal of temporary hardness by boiling.
- Option 'C', Mg(HCO3)2Ca(HCO3)2, is incorrect as it does not correspond to the products of the decomposition of bicarbonates during boiling.
- Option 'D', Ca(HCO3)2.Mg(OH)2, is incorrect as it does not reflect the compounds that precipitate out during the removal of temporary hardness by boiling.
In conclusion, the correct compounds formed during the removal of temporary hardness by boiling are calcium carbonate (CaCO3) and magnesium hydroxide (Mg(OH)2), which is represented by option 'A'.
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Attempt All Questions sub parts from each question.Elasticity vs. plasticity: Objects get deformed when pushed, pulled, and twisted. Elasticity is the measure of the amount that the object can return to its original shape after these external forces and pressure are removed. The opposite of elasticity is plasticity. When something is stretched, and it stays stretched, the material is said to be plastic. Such deformation is said to be plastic deformation. In elastic deformation, atoms of the material are displaced temporarily from their original lattice site. They return back to their original position after the removal of external force. In plastic deformation, atoms of the solid are displaced permanently from their original lattice site. They don’t return back to the original position even after the removal of external load. So, elastic deformation is temporary, whereas plastic deformation is permanent. Amount of elastic deformation is very small. But the amount of plastic deformation is quite large. External force required for elastic deformation of solid is quite small. Force required for plastic deformation is much higher. Total energy absorbed by the material during elastic and plastic deformation region is called modulus of toughness. Energy absorbed by the material during elastic deformation is called module of resilience. Most materials have an amount of force or pressure for which they deform elastically. If more force or pressure is applied, then they undergo plastic deformation. Materials those have a fair amount of plastic deformation before breaking are said to be ductile. Materials those can't stretch or bend much without breaking are said to be brittle. Copper, aluminium etc. are ductile materials. For this reason those are used for making wires. Glass and ceramics are often brittle; they will not bend; they will break.Q. Ceramic is a ............... material

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