NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions


Consider the change in oxidation state of Bromine corresponding to different emf values as shown in the diagram below :

BrO4- 1.82BrO3-1.5 VHBrO1.595Br21.0652 VBr-

Then the species undergoing disproportionation is

  • BrO3-

  • BrO4-

  • HBrO

  • Br2



Which one of the following conditions will favour maximum formation of the product in the reaction,

A2 (g) + B2 (g)       X2 (g)r H = - XkJ?

  • Low temperature and high pressure

  • Low temperature and low pressure

  • High temperature and low pressure

  • High temperature and high pressure


Low temperature and high pressure

A2 (g)+ B2 (g)   X2 (g);  H = - xkJ

On increasing pressure equilibrium shift in a direction where number of moles decreases i.e. forward direction.

On decreasing temperature, equilibrium shift n exothermic direction i.e., forward direction.

So high pressure and lower temperature favour maximum formation of product.


The bond dissociation energies of X2, Y2 and XY are in the ratio of 1 : 0.5: 1. ΔH for the formation of XY is –200 kJ mol–1. The bond dissociation energy of X2 will be

  • 200 kJ mol-1

  • 100 kJ mol-1

  • 400 kJ mol-1

  • 800 kJ mol-1


The correction factor ‘a’ to the ideal gas equation corresponds to

  • Density of the gas molecules

  • Volume of the gas molecules

  • Forces of attraction between the gas molecules

  • Electric field present between the gas molecules


Which one is a wrong statement?

  • Total orbital angular momentum of electron in 's' orbital is equal to zero

  • An orbital is designated by three quantum numbers while an electron in an atom is designated by four quantum numbers

  • The value of m for dz2 is zero

  • The electronic configuration of N atom is


Magnesium reacts with an element (X) to form an ionic compound. If the ground state electronic configuration of (X) is 1s2 2s2 2p3, the simplest formula for this compound is

  • Mg2X3

  • MgX2

  • Mg3X2

  • Mg2X


The correct order of atomic radii in group 13 elements is

  • B < Al < In < Ga < Tl

  • B < Al < Ga < In < Tl

  • B < Ga < Al < In < Tl

  • B < Ga < Al < Tl < In


Which of the following oxides is most acidic in nature?

  • MgO

  • BeO

  • CaO

  • BaO


Which oxide of nitrogen is not a common pollutant introduced into the atmosphere both due to natural and human activity?

  • N2O5

  • NO2

  • NO

  • N2O


Which of the following molecules represents the order of hybridisation sp2, sp2, sp, sp from left to right atoms?

  • HC≡C-C≡CH

  • CH2=CH-C≡CH

  • CH3-CH=CH-CH3

  • CH2=CH-CH=CH2