The oxidation state of oxygen is zero in

• CO

• O₃

• SO₂

• H₂O₂

Transitional elements are mostly

• diamagnetic

• paramagnetic

• neither diamagnaetic nor paramagnetic

• diamagentic and paramagnetic both

Atomic radii of Ti, Zr and Hf vary

• Ti>Zr> Hf

• Ti<Zr< Hf

• Ti< Hf<Zr

• Ti<Zr=HF

Which element from group V gives most basic compound with hydrogen?

• Nitrogen

• Bismuth

• Arsenic

• Phosphorus

Which of the following radicals will not be precipitated by passing H₂S in concentrated acid solution?

• Copper

• Antimony

• Arsenic

• Cadmium

Which of the following properties increases on going down from F to I in group VII-A of the periodic table?

• Electronegativity

• Volatile nature

• Ionic radius

• Oxidising power

Which transition element of the following outermost electronic configuration shows the highest oxidation state?

• 3d³, 4s²

• 3d⁵, 4s¹

• 3d⁵, 4s²

• 3d⁶, 4s²

In which of the following solvents, AgBr will have the highest solubility?

• 10^-3 M NaBr

• 10^-3 M NH₄OH

• Pure water

• 10^-3 M HBr

Which of the following has the highest value of solubility product?

• CuS

• Bi₂S₃

• CdS

• ZnS

Point out in which of the following properties oxygen differs from the rest of the members of its family (Group-VIA)?

• High value of ionisation energies

• Oxidation states (2,4,6)

• Polymorphism

• Formation of hydrides