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JEE CHEMISTRY MCQ: S-BLOCK ELEMENTS
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The yellow light for illumination of lamps is from:
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Correct option: B
Sodium vapour lamp
Option B (Sodium vapour lamp) is correct because sodium vapor lamps emit a characteristic yellow light when heated.
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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.