Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
JEE Main201912 Apr 2019Evening ShiftChemistryHydrogenActual

The temporary hardness of a water sample is due to compound X . Boiling this sample converts X to compound Y . X and Y , respectively, are:

Options

  1. AM g H C O 3 2 and M g C O 3
  2. BC a H C O 3 2 and C a O H 2
  3. CM g H C O 3 2 and M g O H 2
  4. DC a H C O 3 2 and C a O

Correct answer

C. M g H C O 3 2 and M g O H 2

Step-by-step solution

Both M g H C O 3 2 and C a H C O 3 2 are responsible for temporary hardness. Mg HC O 3 2 X → Boiling 2MgC O 3 ↓ + C O 2 ↑ + H 2 O C O 3 - 2 + H 2 O → HC O 3 - + O H - M g + 2 + 2 O H - → Mg OH 2 ( Y )

Practice Hydrogen on Quantrex Academy →

More from Hydrogen

The mass of iron converted into Fe₃O₄ by the action of 18 g of steam is : (Given : Molar mass of H, O and Fe are 1 , 16 and 56 g mol ⁻¹ respectively) Assume iron is present in exce 2026During water-gas shift reaction 2023Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R. Assertion A : Isotopes of hydrogen have almost same chemical properties, but d 2023Given 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 met 2023Match List I with List II List I Type of Hydride List II Example A Electron deficient hydride I MgH 2 B Electron rich hydride II HF C Electron precise hydride III B 2 H 6 D Saline 2023Which hydride among the following is less stable? 2023Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R . Assertion A : Physical properties of isotopes of hydrogen are different. Reas 2023Given below are two reactions, involved in the commercial production of dihydrogen H 2 . The two reactions are carried out at temperature “ T 1 ” and “ T 2 &rdquo 2023 Full Hydrogen list All JEE Main PYQs