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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3pt051

Select the correct statement(s) about metals, non-metals and metalloids.

AMost non-metals form acidic oxides.
BAluminium has an amphoteric oxide even though it lies close to the metalloid boundary.
CAll elements to the left of the staircase line are metals, including hydrogen.
DGermanium and tin are both metalloids.

Answer: A, B

Oxides of non-metals such as

CO X_{2}

,

SO X_{3}

are acidic, and

Al X_{2} O X_{3}

is amphoteric, so A and B are true. Hydrogen is a non-metal, so C is false. Sn is a metal, so D is false.

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