The only non-metal which is liquid at ordinary temperature is

Which of the following is non-metallic ?

Which is chemically most active non-metal ?

Solution

F₂ has highest electronegativity,so it is chemically mostactive non metal.

Which one of the following is not a transition metal ?

Solution

Cd is not a transition metal among the given options because it do not have incomplete d-sub shell either inits atomic state [Cd 5d¹⁰4s²] or in its common oxidation state (Cd²⁺ = 5d¹⁰4s⁰)

Polarisation power of a cation increases when

Solution

The tendency of a cation to distort the electron cloud of an anion when it is approaching the anion, is called polarisation power of cation.As polarisation power of cation increases, the covalent character increases.According to Fajan's rule high charge and small size of cation will favour covalency. So, polarisation power of a cation increases with charge of the cation.

A mong the following elements, the one having the highest ionisation energy is.

Solution

I.E. increases across a period and decreases down in a group. So, element withe lectronic configuration [Ne]3s² 3p³ will have the highest I.E. among the given choices.

The statement that is not true for the long form of the periodictable is

it reflects the sequence of filling electrons in the order of sub-energy levels s, p, d and f.
it helps to predict the stable valence states of theelements
it reflects trends in physical and chemical properties of the elements
it helps to predict the relative ionicity of the bond between any two elements.

An element X occurs in short period having configuration ns² np¹. The formula and nature of its oxide is

Solution

ns² p¹ is the electronic configuration of III A period.Al₂O₃ is amphoteric oxide.

Who developed long form of the periodic table?

The elements in which 4 forbitals are progressively filled upare called as

UnAttempted

0

Attempted

Correct

Wrong