The Sensex at the Bombay Stock Exchange ended with a marginal gain of 10 points, or 0.1 percent, at 19,742, after volatile trade on Monday, amid a rise in wholesale inflation in August. But the Nifty at the National Stock Exchange declined 10 points, or 0.2 percent, to 5,841.Stock markets in Hong Kong, South Korea and Singapore rose between 1 percent and 1.9 percent.