Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

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1.

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


C.

HBrO

Calculate Ecell° corresponding to each compound undergoing disproportionation reaction. The reaction for which Ecell° comes out +ve is spontaneous.

HBrO   Br2Eo = 1.595 V, SRP (cathode)HBrO    BrO3-Eo = - 1.5 V, SOP (anode)2HBrO   Br2 + BrO3-Ecello = SRP (cathode)- SRP (anode)= 1.595 - 1.5= 0.095 VEcell0> 0  Go < 0 [spontaneous]


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2.

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


3.

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


4.

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


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5.

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


6.

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


7.

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


8.

Which of the following oxides is most acidic in nature?

  • MgO

  • BeO

  • CaO

  • BaO


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9.

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

  • N2O5

  • NO2

  • NO

  • N2O


10.

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


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