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JEE CHEMISTRY MCQ: S-BLOCK ELEMENTS
1
Medium
1 of 1
Understanding
+4 | -1
Statement-I : Exhausted permutit can be
regenerated by adding .
Statement-II : Calgon forms soluble
complexes with cations which are causing
hardness to water.
regenerated by adding .
Statement-II : Calgon forms soluble
complexes with cations which are causing
hardness to water.
View answer and explanation
Correct option: C
Statement I is incorrect but statement II
is correct
is correct
Option C is correct because exhausted permutit is regenerated by adding 10% NaCl, not CaCl2, and Calgon does form soluble complexes with cations causing hardness.
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Assertion (A): Among the alkali metals, lithium salts exhibit the least electrical condutance in aqueous solutions.
Reason (R): Smaller the radius of the hydrated cation, lower is the electrical conductance in aqueous solutions. is a ternary salt with divalent cation. gives yellow ppt. with as well as with . (A) is precipitated by neither in acidic nor ammoniacal medium, but addition of in gave white ppt. (B). of gave of . Identify . In the Down’s cell is added in to: Which of the alkali metal is having least melting point? Fusion mixture is comprised of: Statement 1: is predominatly a covalent compound.
Statement 2: Electronegativity difference between and is too small.
Reason (R): Smaller the radius of the hydrated cation, lower is the electrical conductance in aqueous solutions. is a ternary salt with divalent cation. gives yellow ppt. with as well as with . (A) is precipitated by neither in acidic nor ammoniacal medium, but addition of in gave white ppt. (B). of gave of . Identify . In the Down’s cell is added in to: Which of the alkali metal is having least melting point? Fusion mixture is comprised of: Statement 1: is predominatly a covalent compound.
Statement 2: Electronegativity difference between and is too small.