UK stocks were expected to open slightly lower on Tuesday morning ahead of a raft of economic data, with investors treading cautiously on the last day of the first quarter.City sources predict the FTSE 100 will open just five points lower than Monday's close of 6,891.43."Quarter end can bring about some unusual trading activity which should be taken into consideration today as investors look to balance their books. The fact that we're also approaching the end of the financial year may also feed into this," said analyst Craig Erlam from Oanda.A flurry of economic data from the UK is also due for release on Tuesday, including consumer confidence, balance of payments, and the final estimate of fourth-quarter gross domestic product.German unemployment data will also be under the spotlight, with the jobless rate expected to remain unchanged at 6.5% in March.Eurozone consumer prices will also be in focus and are predicted to have fallen at an annual rate of 0.1% in March after a 0.3% decline in February.Stocks to watchThe day after its acquisition of French chain Mr Bricolage hit the rocks, do-it-yourself group Kingfisher said it would close 60 stores as new chief executive Véronique Laury announced full-year results and set out her plans for a "very different" company. Adjusted pre-tax profit fell 7.5% to £675m despite a 2.9% increase in sales to £10.97bn.UK-listed miner Antofagasta has quashed rumours that it was looking to merge with copper producing peer Teck Resources. Both Antofagasta and Canada-based Teck have denied the speculation, despite a Bloomberg report that suggested the two were in "early-stage talks".