In the reaction :

X is -

• SiC

• H₂SO₄

• KMnO₄

• Fe/ HCl

NH₃ gas is dried over :

• CaO

• HNO₃

• P₂O₅

• CuSO₄

Fluorine exhibits an oxidation state of only -1 because:

• it can readily accept an electron

• it is very strongly electronegative

• it is a non-metal

• it belong to halogen family

Which among the following factors is the most important in making fluorine the strongest oxidizing agent ?

• Electron affinity

• Ionization enthalpy

• Hydration enthalpy

• Bond dissociation energy

Philosopher's wool on heating with BaO at 1100°C produce :

• Ba + ZnCl₂

• BaCdO₂

• BaZnO₂

• BaO₂ + Zn

For advertisement, the coloured discharged tubes contain :

• He

• Ne

• Ar

• Kr

1077.

Which one of the following compounds, is not a protonic acid ?

• SO(OH)₂

• SO₂(OH)₂

• B(OH)₃

• PO(OH)₃

Which of the following is anhydride of perchloric acid ?

• Cl₂O₇

• Cl₂O₅

• Cl₂O₃

• HClO

The oxidation states of iodine in HIO₄ H₃IO₅ and H₅IO₆, are respectively :

• + 1, + 3, + 7

• + 7, + 7, + 3

• + 7, + 7, + 7

• 7, + 5, + 3

Amphoteric-oxide combinations are in:

• ZnO, K₂O, SO₃

• ZnO, P₂O₅, Cl₂O₇

• SnO₂, Al₂O₃, ZnO

• PbO₂, SnO₂, SO₃