JEE Main202126 Feb 2021Evening ShiftChemistryHydrogenActual

Calgon is used for water treatment. Which of the following statement is NOT true about Calgon?

Options

AIt is polymeric compound and is water soluble.
BCalgon contains the 2 nd most abundant element by weight in the Earth's crust.
CIt is also known as Graham's salt.
DIt doesnot remove Ca 2 + ion by precipitation.

Correct answer

B. Calgon contains the 2 nd most abundant element by weight in the Earth's crust.

Step-by-step solution

→ 2 nd most abundant element is Si and it is not present in calgon Na 6 P 6 O 18 = (Graham's salt)(Sodium hexametaphosphate) → It exist in polymeric form as NaPO 3 6 and water soluble compound → It removes Ca 2 + in soluble ion but not by precipitation

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 2026 During water-gas shift reaction 2023 Given 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 2023 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 met 2023 Match 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 2023 Which hydride among the following is less stable? 2023 Given 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 2023 Given 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