The three powers of the Senate from your list are:
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Ratify treaties - The Senate has the exclusive power to approve treaties negotiated by the President.
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Try cases of the impeachment of federal officials - The Senate holds the trial for federal officials impeached by the House of Representatives.
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Confirm Presidential appointments - The Senate confirms presidential nominations for federal positions, including judges and cabinet members.
The other options, "initiate revenue bills" and "impeach federal officials," are powers reserved for the House of Representatives. "Elect the President in the event of an Electoral College tie" is a power given to both the House of Representatives and the Senate but is not a Senate-exclusive power.