At about 15,200 feet, the Dufourspitze is the highest peak in which country?

Colorado's Mount Elbert is the highest peak in which mountain chain? Which peak is California's highest point? In 1991, at 15, Judit Polgar broke Bobby Fischer's record as the youngest person to earn which chess title? At 15 in 1989, Jack Staddon won the first of which contests sponsored by National Geographic? At 16 in 1785, which future first consul became head of his family and graduated from the Paris military academy? At 16, which future "Jerry Maguire" co-star was breakdancing on stage with Lionel Richie at the 1984 Olympics? Puncak Jaya, the world's highest island peak, is on which island? Vinson Massif is the highest point on which continent?