Boiling of hard water is helpful in removing the temporary hardness by converting calcium hydrogen carbonate and magnesium hydrogen carbonate to
- CaCO3 and Mg(OH)2
- CaCO3 and MgCO3
- Ca(OH)2 and MgCO3
- Ca(OH)2 and Mg(OH)2
The Correct Option is A
Solution and Explanation
The correct answer is (A): CaCO3 and Mg(OH)2
\(Ca(HCO_3)_2\)\(\stackrel{Δ}{→}\) \(CaCO_3\) \(↓\) +\(H_2O\) + \(CO_2\) \(↑\)
\(Mg(HCO_3)_2\)\(\stackrel{Δ }{→}\) \(Mg(OH)_2\)+ \(2CO_2\)\(↑\)
Top Questions on heavy water
- Given below are two statements:
Statement I: Permutit process is more efficient compared to the synthetic resin method for the softening of water.
Statement II: Synthetic resin method results in the formation of soluble sodium salts.
In the light of the above statements, choose the most appropriate answer from the options given below:- JEE Main - 2023
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- Match List-I with List-II :
List-I (Species) List-II (Maximum allowed concentration in ppm in drinking water) A F- I < 50 ppm B \(SO^{2-}_4\) II < 5 ppm C \(NO^-_3\) III < 2 ppm D Zn IV < 500 ppm Choose the correct answer from the options given below :
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Solute A associates in water. When 0.7 g of solute A is dissolved in 42.0 gof water, it depresses the freezing point by 0.2°C. The percentage association of solute A in water is :
[Given : Molar mass of A = 93 g mol–1. Molal depression constant of water is 1.86 K kg mol–1.]
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- Some statements about heavy water are given below. (i) Heavy water is used as moderator in nuclear reactors (ii) Heavy water is more associated than ordinary water (iii) Heavy water is more effective solvent than ordinary water Which of the above statements are correct?
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- $ NaCl $ is less soluble in heavy water than in ordinary water. Dielectric constant of ordinary water is more than that of heavy water.
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Questions Asked in JEE Main exam
- A convex lens of focal length 40 cm forms an image of an extended source of light on a photo-electric cell. A current \( I \) is produced. The lens is replaced by another convex lens having the same diameter but focal length 20 cm. The photoelectric current now is:
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The portion of the line \( 4x + 5y = 20 \) in the first quadrant is trisected by the lines \( L_1 \) and \( L_2 \) passing through the origin. The tangent of an angle between the lines \( L_1 \) and \( L_2 \) is:
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Concepts Used:
Heavy Water
Heavy water (2H2O, D2O - deuterium oxide) is a form of water that consists only of deuterium rather than the common hydrogen-1 isotope that composes most of the hydrogen in normal water. The presence of the heavier hydrogen isotope gives the water distinct nuclear properties, and the increase of mass gives it slightly distinct physical and chemical properties when compared to normal water.
There are some other heavy forms of water such as;
- Semiheavy water
- Heavy-oxygen water
- Tritiated water
Properties of Hard Water:
- Heavy water is slighter dissociated than light water at a given temperature, and the true concentration of D+ ions is slighter than H+ ions would be for a light water sample at the same temperature.
- Heavy water is more concentrated than ordinary water, and heavy water has physically distinct properties that can be seen without equipment if a frozen sample is dropped into normal water, as it will sink.