The Nikkei stock index rose Monday morning, led by solid auto and chip-linked shares on the back of the yen’s weakness against the U.S. dollar and gains by U.S. tech issues late last week. The 225-issue Nikkei Stock Average rose 62.13 points, or 0.16 percent, from Friday to 38,709.88. The broader Topix index was down 0.07 point at 2,712.56. The dollar was firmer before falling to around the 146 yen line on persistent market expectations of a shift to monetary easing by the Federal Reserve at this month’s meeting, dealers said. At noon, the dollar fetched 145.97-98 yen compared with 146.15-25 y…