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JEE CHEMISTRY MCQ: S-BLOCK ELEMENTS
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Which of the alkali metal is having least melting point?
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Correct option: D
Cs
Option D (Cs) is correct because melting point decreases down the group in alkali metals due to increasing atomic size and weaker metallic bonding.
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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: Fusion mixture is comprised of: Statement 1: is predominatly a covalent compound.
Statement 2: Electronegativity difference between and is too small. Metal air white fumes. Metal can be
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: Fusion mixture is comprised of: Statement 1: is predominatly a covalent compound.
Statement 2: Electronegativity difference between and is too small. Metal air white fumes. Metal can be