The method used to remove temporary hardness of water is:
- ion-exchange method
- Synthetic resins method
- Calgon's method
- Clark's method
The Correct Option is D
Solution and Explanation
${Ca(HCO_3)_2 + Ca(OH)_2 -> 2CaCO_3 V + 2H_2 O }$
${Mg(HCO_3)_2 + 2Ca(OH)_2 -> 2CaCO_3 V + Mg(OH)_2 V + 2H_2 O}$
Top Questions on GROUP 2 ELEMENTS
- The correct order of density is
- JEE Main - 2023
- Chemistry
- GROUP 2 ELEMENTS
- Reaction of \(BeCl_2\) with \(LiAlH_4\) gives :
- \(AlCl_3\)
- \(BeH_2\)
- \(LiH\)
- \(LiCl\)
- \(BeAlH_4\)
- JEE Main - 2022
- Chemistry
- GROUP 2 ELEMENTS
- Which one of the following alkaline earth metal ions has the highest ionic mobility in its aqueous solution?
- JEE Main - 2022
- Chemistry
- GROUP 2 ELEMENTS
- The structures of beryllium chloride in solid state and vapour phase, are :
- NEET (UG) - 2021
- Chemistry
- GROUP 2 ELEMENTS
- What is the role of gypsum, $CaSO_{4}.2H_{2}O$ in setting of cement ? Identify the correct option from the following :
- NEET (UG) - 2020
- Chemistry
- GROUP 2 ELEMENTS
Questions Asked in NEET exam
- Out of the following complex compounds, which of the compound will be having the minimum conductance in solution?
- NEET (UG) - 2025
- Inorganic chemistry
A bob of heavy mass \(m\) is suspended by a light string of length \(l\). The bob is given a horizontal velocity \(v_0\) as shown in figure. If the string gets slack at some point P making an angle \( \theta \) from the horizontal, the ratio of the speed \(v\) of the bob at point P to its initial speed \(v_0\) is :
- NEET (UG) - 2025
- Pendulums
- Two cities X and Y are connected by a regular bus service with a bus leaving in either direction every T min. A girl is driving scooty with a speed of 60 km/h in the direction X to Y. She notices that a bus goes past her every 30 minutes in the direction of her motion, and every 10 minutes in the opposite direction. Choose the correct option for the period T of the bus service and the speed (assumed constant) of the buses.
- NEET (UG) - 2025
- Relative Velocity
- Consider the diameter of a spherical object being measured with the help of a Vernier Callipers. Suppose its 10 Vernier Scale Divisions (V.S.D.) are equal to its 9 Main Scale Divisions (M.S.D.). The least count in the M.S. is 0.1 cm and the zero of V.S. is at -0.1 cm when the jaws of Vernier callipers are closed. If the main scale reading for the diameter is \(M = 5\) cm and the number of coinciding vernier division is 8, the measured diameter after zero error correction, is:
- NEET (UG) - 2025
- Measurement of length
- Which of the following are paramagnetic?
A. [NiCl$_4$]$^{2-}$
B. Ni(CO)$_4$
C. [Ni(CN)$_4$]$^{2-}$
D. [Ni(H$_2$O)$_6$]$^{2+}$
E. Ni(PPh$_3$)$_4$
Choose the correct answer from the options given below:- NEET (UG) - 2025
- Coordination chemistry
NEET Notification
Concepts Used:
Group 2 Elements
The group two or alkaline earth metals are s-block elements with two electrons in their s-orbital. They are alkaline earth metals. They are named so because of the alkaline nature of the hydroxides and oxides.
Alkaline earth metals are characterized by two s-electrons. This group of elements includes:
- Beryllium (Be)
- Magnesium (Mg)
- Calcium (Ca)
- Strontium (Sr)
- Barium (Ba)
- Radium (Ra)
Elements whose atoms have their s-subshell filled with their two valence electrons are called alkaline earth metals. Their general electronic configuration is [Noble gas] ns2. They occupy the second column of the periodic table and so-called as group two metals also.