Science Chemistry MCQ-189

General Science-Chemistry online Exam CivilsPrelims, SSC, UPSC, CDS, JPSC, RBI, UPPSC, NDA Exams

In a given atom, no two electrons can have the same value for all the four quantum number. This is called


The atomic orbital is


finding electron The maximum number of electrons on a principal shell


The total number of orbital in principal shell is


Which orbital is dum-bell shaped


Match column-I and column-II


A . Thomson model
B . Rutherford model
C .Bohr’s model
D .de-Broglie theory .


1. Dual nature of electron
2. Nuclear theory
3. Plum pudding model
4. Concept of quantization of energy


The electronic configuration of atom/ion can be defined by which of the following ?


The number of unpaired electrons in carbon atom is


Meson was discovered by


Nuclear particles responsible for holding all nucleons together are


Cathode rays can be deflected by


Structure of solids is investigated by using


When spectral lines obtained from atomic spectra is placed in a magnetic field they are splitted into number of fine lines, this is called………


The constituent particle of a nucleus in an atom are


The ?-particle carries two positive charges. Its mass is very nearly equal to that of


In an atom the order of filling up of the orbitals is governed by-


Regarding the atom of a chemical element, the magnetic quantum number refers to


By which one of the following, an old written material which can not be read easily, can be read ?


Wavelength of which of the following colours of the visible spectrum of light are maximally absorbed by green plants


Which of the following has highest frequency ?


Which of the following electromagnetic wave has the longest wave length ?


Which of the following has the longest wave length ?


Which electromagnetic radiation is emitted by radioactive substances


Which of the following waves can propagate in vacuum ?

1. Radio waves
2. Light waves
3. x – rays
4. Ultrasonic waves

Select the correct answer using codes given below


The number of unpaired electrons in Mn2+ is