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Per NCERT §3.2 + Table 3.3, Mendeleev predicted the existence of 'Eka-aluminium' and 'Eka-silicon' — which later turned out to be which elements?
AGallium (Ga) and Germanium (Ge)
BBoron and Carbon
CThallium and Lead
DIndium and Tin
Answer & Solution
Correct answer: A. Gallium (Ga) and Germanium (Ge)
Per NCERT §3.2 Table 3.3, eka-Al = Ga; eka-Si = Ge. Mendeleev left gaps + correctly predicted their properties.
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