Every question from past board papers on Modern periodic law and periodic table, s, p, d, f blocks, newest paper first. Open any question for its full worked answer.
Which among the following electronic configurations belong to main group elements?
A. \([\mathrm{Ne}]3s^1\) B. \([\mathrm{Ar}]3d^3 4s^2\) C. \([\mathrm{Kr}]4d^{10}5s^2 5p^5\) D. \([\mathrm{Ar}]3d^{10}4s^1\) E. \([\mathrm{Rn}]5f^0 6d^2 7s^2\)
Choose the correct answer from the option given below :
Which one of the following statements is correct?
Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R :
Assertion A : Metallic sodium dissolves in liquid ammonia giving a deep blue solution, which is paramagnetic.
Reasons R : The deep blue solution is due to the formation of amide.
In the light of the above statements, choose the correct answer from the options given below :
The IUPAC name of an element with atomic number 119 is
Match List - I with List - II.
List - I: (a) Li (b) Na (c) KOH (d) Cs
List - II: (i) absorbent for carbon dioxide (ii) electrochemical cells (iii) coolant in fast breeder reactors (iv) photoelectric cell
Choose the correct answer from the options given below :
Identify the incorrect statement from the following
Identify the incorrect match.
Name | IUPAC Official Name
(a) Unnilunium | (i) Mendelevium
(b) Unniltrium | (ii) Lawrencium
(c) Unnilhexium | (iii) Seaborgium
(d) Unununnium | (iv) Darmstadtium
The element Z = 114 has been discovered recently. It will belong to which of the following family/group and electronic configuration ?
Which of the following statements is false ?
Which of the following statements about hydrogen is incorrect ?
The suspension of slaked lime in water is known as
