NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions


The value of Planck's constant is 6.63 x 10-34 Js. The speed of light is 3 x 1017 nms-1. Which value is closest to the wavelength in nanometer of a quantum of light with frequency of 6 x 1015 s-1?

  • 10

  • 25

  • 50

  • 75


What is the maximum numbers of electrons that can be associated with the following set of quantum numbers? n = 3, l = 1 and m =-1.

  • 10

  • 6

  • 4

  • 2


Based on equation E = -2.178 × 10-18 J Z2n2 certain conclusions are written. Which of them is not correct?

  • The negative sign in equation simply means that the energy of electron bound to the nucleus is lower than it would be if the electrons were at the infinite distance from the nucleus.

  • Larger the value of n, the larger is the orbit radius

  • Equation can be used to calculate the change in energy when the electron changes orbit.

  • For n = 1 the electron has a more negative energy than it does for n = 6 which means that the electron is more loosely bound in the smallest allowed orbit.


How many grams of concentrated nitric acid solution should be used to prepare 250 mL of 2.0M HNO3 ? The concentrated acid is 70% HNO3.

  • 45.0 g conc. HNO3

  • 90.0 g con. HNO3

  • 70.0 g conc. HNO3

  • 54.0 g conc. HNO3


Maximum deviation from ideal gas is expected from

  • H2(g)

  • N2(g)

  • CH4(g)

  • NH3(g)


Dipole-induced dipole interactions are present in which of the following pairs?

  • H2O and alcohol

  • Cl2 and CCl4

  • HCl and He atoms

  • SiF4 and He atoms



Which of  the following structure is similar to graphite?

  • CO

  • O2-

  • CN-

  • NO+



Paramagnetic species contains unpaired electrons in their molecular orbital electronic configuration.
Molecular orbital configuration of the given species is as

  CO(6+8 =14)                      =σ1s2,σ*1s2, σ2s2, σ*2s2, π2px2  π2py2, σ2pz2 

(All the electrons are paired so it is diamagneitc.)

 O2-(8+8+1=17)       = σ1s2, σ*1s2, σ2s2,σ*2s2,σ2pz2, π2px2,  π2py2,π*2px2π*2py1

It contains one unpaired electron so it is paramagnetic.
CN- (6+ 74 1= 14)= same as CO
NO+ (7+ 8- 1)= same as CO
Thus, among the given species only O2- is paramagnetic.


XeF2 is isostructural with

  • TeF2

  • ICl2-

  • SbCl3

  • BaCl2


An excess of AgNO3 is added to 100 mL of a 0.01 M solution of dichlorotetraaquachromium (III) chloride. The number of moles of AgCl precipitate would be

  • 0.001

  • 0.002

  • 0.003

  • 0.01


Which ofthese is least likely to act as a Lewis base?

  • CO

  • F-

  • BF3

  • PF3