The molecular formula of a commercial resin used for exchanging ions in water softening is $C_8H_7SO_3Na$ (molecular weight = $206$). What would be the maximum uptake of $Ca^{2+}$ ions by the resin when expressed in mole per gram resin
- $\frac{1}{103}$
- $\frac{1}{206}$
- $\frac{2}{309}$
- $\frac{1}{412}$
The Correct Option is D
Solution and Explanation
$2 \times 206\, gm$ take $1$ mole of $Ca ^{2+}$
$\therefore 1\, gm$ takes $\frac{1}{412}$ mole of $Ca ^{2+}$.
Top Questions on water
- Which of the following is not related to the removal of permanent hardness of water?
- What is the volume occupied by 1 molecule of water, if its density is 1 g/cm$^3$?
14g of cyclopropane burnt completely in excess oxygen. The number of moles of water formed is:
- What is the quantity of current required to liberate 16g of O\(_2\) (g) during electrolysis of water? (Given 1F = 96500C)
- An aqueous solution contains 20g of a non-volatile strong electrolyte \( {A}_2{B} \) (Molar mass = 60 g mol\(^{-1}\)) in 1 kg of water. If the electrolyte is 100% dissociated at this concentration, what is the boiling point of the solution? (Kb of water is 0.52 K kg mol\(^{-1}\))
Questions Asked in JEE Main exam
- Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) : If Young’s double slit experiment is performed in an optically denser medium than air, then the consecutive fringes come closer.
Reason (R) : The speed of light reduces in an optically denser medium than air while its frequency does not change.
In the light of the above statements, choose the most appropriate answer from the options given below : - The increase in pressure required to decrease the volume of a water sample by 0.2percentage is \( P \times 10^5 \, \text{Nm}^{-2} \). Bulk modulus of water is \( 2.15 \times 10^9 \, \text{Nm}^{-2} \). The value of \( P \) is ________________.
- JEE Main - 2025
- System of Particles & Rotational Motion
The motion of an airplane is represented by the velocity-time graph as shown below. The distance covered by the airplane in the first 30.5 seconds is km.
- JEE Main - 2025
- Kinematics
- A force \( \mathbf{F} = 2\hat{i} + b\hat{j} + \hat{k} \) is applied on a particle and it undergoes a displacement \( \mathbf{r} = \hat{i} - 2\hat{j} - \hat{k} \). What will be the value of \( b \), if the work done on the particle is zero?
- JEE Main - 2025
- Work and Energy
Which of the following statement is true with respect to H\(_2\)O, NH\(_3\) and CH\(_4\)?
(A) The central atoms of all the molecules are sp\(^3\) hybridized.
(B) The H–O–H, H–N–H and H–C–H angles in the above molecules are 104.5°, 107.5° and 109.5° respectively.
(C) The increasing order of dipole moment is CH\(_4\)<NH\(_3\)<H\(_2\)O.
(D) Both H\(_2\)O and NH\(_3\) are Lewis acids and CH\(_4\) is a Lewis base.
(E) A solution of NH\(_3\) in H\(_2\)O is basic. In this solution NH\(_3\) and H\(_2\)O act as Lowry-Bronsted acid and base respectively.
- JEE Main - 2025
- Molecular Orbital Theory
Concepts Used:
Water
Water is a chemical compound whose one molecule is composed of 2 atoms of hydrogen and 1 atom of oxygen, giving it the chemical formula: H2O.
Water is also known to be a universal solvent because it can dissolve (solute) almost anything and everything in it. Water is what earth’s hydrosphere is made up of along with 60% of our bodies and in some organisms, the Water content is as high as 90%.
Use of Water:
Water resources are necessary for sustaining life as well as for economic development as well but all of this can lead to making the most of our already limited Freshwater resources. These are the following practices that one can adopt to utilize water more responsibly:
- Reclamation of Water
- Rainwater Harvesting
- Reduce the usage of Water
- Desalination