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
- 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 :
- JEE Main - 2023
- Chemistry
- 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
- Chemistry
- heavy water
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.]
- JEE Main - 2022
- Chemistry
- heavy water
- 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?
- VITEEE - 2012
- Chemistry
- heavy water
- $ NaCl $ is less soluble in heavy water than in ordinary water. Dielectric constant of ordinary water is more than that of heavy water.
- AIIMS - 2011
- Chemistry
- heavy water
Questions Asked in JEE Main exam
- A bag contains 10 balls out of which \( k \) are red and \( (10-k) \) are black, where \( 0 \le k \le 10 \). If three balls are drawn at random without replacement and all of them are found to be black, then the probability that the bag contains 1 red and 9 black balls is:
- JEE Main - 2026
- Probability
Which one of the following graphs accurately represents the plot of partial pressure of CS₂ vs its mole fraction in a mixture of acetone and CS₂ at constant temperature?
- JEE Main - 2026
- Organic Chemistry
- For two identical cells each having emf \(E\) and internal resistance \(r\), the current through an external resistor of \(6\,\Omega\) is the same when the cells are connected in series as well as in parallel. The value of the internal resistance \(r\) is ________ \(\Omega\).
- JEE Main - 2026
- Current electricity
- For three unit vectors \( \vec a, \vec b, \vec c \) satisfying \[ |\vec a-\vec b|^2 + |\vec b-\vec c|^2 + |\vec c-\vec a|^2 = 9 \] and \[ |2\vec a + k\vec b + k\vec c| = 3, \] the positive value of \( k \) is:
- JEE Main - 2026
- Vector Algebra
In the given figure, the blocks $A$, $B$ and $C$ weigh $4\,\text{kg}$, $6\,\text{kg}$ and $8\,\text{kg}$ respectively. The coefficient of sliding friction between any two surfaces is $0.5$. The force $\vec{F}$ required to slide the block $C$ with constant speed is ___ N.
(Given: $g = 10\,\text{m s}^{-2}$)
- JEE Main - 2026
- Rotational Mechanics
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.