AIEEE Exam

Rusting takes place in
(1) air-free moisture (2) moisture-free air
(3) moist air (4) none of these

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AIEEE Other Question

Which of the following is not a reversible change ?
(1) The changing of water into steam
(2) The melting of iron
(3) The burning of kerosene
(4) The freezing of water Which of the following is a divalent radical ?
(1) Hydroxide (2) Nitrate
(3) Sulphate (4) Phosphate