Atomic radii of Ti, Zr and Hf vary
Ti>Zr> Hf
Ti<Zr< Hf
Ti< Hf<Zr
Ti<Zr=HF
D.
Ti<Zr=HF
Ti, Zr and Hf belong to IV B group of Periodic Table and in a group atomic radii increases on moving down. However, the transition metals of 4d-series have nearly the same radii as metals of Sd-series.
Hence, the order of atomic radii is
Ti < Zr = Hf
Due to nearly equal atomic radii, Zr and Hf are called chemical twins.
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
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 properties increases on going down from F to I in group VII-A of the periodic table?
Electronegativity
Volatile nature
Ionic radius
Oxidising power
Transitional elements are mostly
diamagnetic
paramagnetic
neither diamagnaetic nor paramagnetic
diamagentic and paramagnetic both
Which element from group V gives most basic compound with hydrogen?
Nitrogen
Bismuth
Arsenic
Phosphorus
Which transition element of the following outermost electronic configuration shows the highest oxidation state?
3d3, 4s2
3d5, 4s1
3d5, 4s2
3d6, 4s2
Which of the following radicals will not be precipitated by passing H2S in concentrated acid solution?
Copper
Antimony
Arsenic
Cadmium
