Which of the following sulphides is yellow in colour ?

• CuS

• CdS

• ZnS

• CoS

Which of the following oxide does not form acidic aqueous solution ?

• N₂O₃

• NO₂

• N₂O₅

• NO

The number of P - O - P bridges in the structure of phosphorus pentoxide and phosphorus trioxide are respectively

• 6, 6

• 5, 5

• 5, 6

• 6, 5

Fluorine is the best oxidising agent because it has :

• highest electron affinity

• highest E^o_red

• highest E^o_oxid

• lowest electron effinity

Bleaching action of SO₂ is due to its :

• oxidising property

• acidic property

• basic property

• reducing property

When I₂ is passed through KCl , KF and KBr solutions :

• Cl₂ and Br₂ are evolved

• Cl₂ is evolved

• Cl₂ , Br₂ and F₂ are evolved

• none of the above

Assertion : Sb₂S₃ is not soluble in yellow ammonium sulphide.

Reason : The common ion effect due to S^2- ions reduces the solubility of Sb₂S₃.

• If both assertion and reason are true and reason is the correct explanation of the assertion.

• If both assertion and reason are true but reason is not the correct explanation of the assertion.

• If assertion is true, but reason is false.

• Both assertion and reason are false statements.

Assertion : Reaction of SO₂ and H₂S in the presence of Fe₂O₃ catalyst gives elemental sulphur.

Reason : SO₂ is a reducing agent.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.

1269.

The element which forms oxides in all oxidation states +I to +V is

• N

• P

• As

• Sb

The true statement for the acids of phosphorus, H₃PO₂, H₃PO₃ and H₃PO₄ is

• the order of their acidity is H₃PO₄ > H₃PO₃ > H₃PO₂

• all of them are reducing in nature

• all of them are tribasic acids

• the geometry of phosphorus is tetrahedral in all the three