AIEEE Exam

Which of the following is a divalent radical ?
(1) Hydroxide (2) Nitrate
(3) Sulphate (4) Phosphate

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AIEEE Other Question

Rusting takes place in
(1) air-free moisture (2) moisture-free air
(3) moist air (4) none of these How many times greater is the valency of N in
NH3 than that of Cl in HCl ?
(1) 2 (2) 3
(3) 4 (4) 5