Chemistry
Which of the following kinds of spectroscopy can provide information on the energy difference between the initial and final states rather the energy levels involved in the transition

UV photoelectron spectroscopy
Rotational spectroscopy
UV absorption spectroscopy
Infrared absorption spectroscopy

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Chemistry
Antacid tablets consist of

Hydroxides of magnesium and sodium
Hydroxides of sodium, magnesium and aluminium
Hydroxides of magnesium and aluminium
Hydroxides of sodium and aluminium

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