White P reacts with caustic soda, the products are PH₃ and NaH₂PO₂. This reaction is an example of

• hydrolysis

• reduction

• disproportionation

• neutralisation

The aqueous solution containing which one of the following ions will be colourless ? (Atomic no. Sc= 21, Fe= 26, Ti= 22, Mn = 25)

• Sc³⁺

• Fe²⁺

• Ti³⁺

• Mn²⁺

The main reason for larger number of oxidation states exhibited by the actinides than the corresponding lanthanides, is

• lesser energy difference between 5f and 6d orbitals than between 4f and 5d orbitals

• larger atomic size of actinides than the lanthanide

• more energy difference between 5f and 6d orbitals than between 4f and 5d orbitals

• greater reactive nature of the actinides than the lanthanides

Cr is member of 3d transition series of atomic number 24. What will be its electronic configuration ?

• 3d⁶4s²

• 3d⁵4s²

• 3d⁴4s²

• 3d⁵4s¹

The element ₉₀Th²³² belong to thorium series. Which of the following will act as the end product of the series?

• ₈₂Pb²⁰⁸

• ₈₂Bi²⁰⁹

• ₈₂Pb²⁰⁶

• ₈₂Pb²⁰⁷

Which of the following turns potassium dichromate paper green?

• NO₂

• HCl

• NH₃

• SO₂

Yellow colour of aqueous solution of potassium chromate changes to orange if dil. H₂SO₄ is added. It indicates:

• chromate ions are reduced

• chromate ions are oxidised

• monocentric complex is converted into dicentric complex

• oxygen gets removed from chromate ions

Which of the following dissolves in hot conc. NaOH solution?

• Fe

• Zn

• Cu

• Ag

Which one of the following represents d-block elements?

• [Rn]6d² , 7s²

• [Xe]4f¹ , 5d¹ , 6s²

• [Xe]4f¹⁴ , 5d¹ , 6s²

• [Xe]5d¹ , 6s²

Pd has exceptional outer electronic configuration as 4d¹⁰ , 5s⁰. It belongs to:

• 4th period , group 11

• 5th period , group 10

• 6th period , group 9

• 3th period , group 16