July 7 (Reuters) - The Nasdaq opened lower on Tuesday amid declining chip stocks, with investors questioning the momentum of the AI-led rally despite Samsung's strong earnings, while a report on China's DeepSeek making its own AI chip also hit sentiment.

The Dow Jones Industrial Average rose 48.1 points, or 0.09%, at the open to 53104.06. The S&P 500 fell 20.8 points, or 0.28%, at the open to 7516.63​, while the Nasdaq Composite dropped 161.0 points, or 0.62%, to 25960.13 at the opening bell.