Study the reaction scheme: dilute nitric acid reacts with metal R to give colourless solution S and colourless gas T. S with aqueous sodium hydroxide gives white precipitate V, insoluble in excess sodium hydroxide; S warmed with aqueous sodium hydroxide and aluminium foil gives colourless gas U.

1. aName metal R. [1]
2. bName colourless solution S. [1]
3. cName colourless gas T. [1]
4. dName colourless gas U. [1]
5. eName white precipitate V. [1]

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