The correct statement regarding entropy is from Chemistry JEE Ye

Subject

Chemistry

Class

JEE Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

1.

The number of oxygen atoms in 4.4gm of CO2 is

  • 1.2 × 1023

  • 6 × 1022

  • 6 × 1023

  • 12 × 1023


2.

If the bond energies of H-H, Br-Br and H-Br are 433, 192 and 364 kJ mol-1 respectively, then H° for the reaction-

H2 (g) + Br2 (g) → 2HBr (g) is

  • -261 kJ

  • +103 kJ

  • +261 kJ

  • -103 kJ


3.

In the reaction,

Fe(OH)3 (s)  Fe3+ (aq) + 3OH- (aq), if the concentration of OH- ions is decreased by 14 times, then the equilibrium concentration of Fe3+ will increase by

  • 8 times

  • 16 times

  • 64 times

  • 4 times


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4.

The correct statement regarding entropy is

  • at absolute zero temperature, entropy of a perfectly crystalline solid is zero

  • at absolute zero temperature, the entropy of a perfectly crystalline substance is positive

  • at absolute zero temperature, the entropy of all crystalline substances is zero

  • at 0°C, the entropy of a perfect crystalline solid is zero


A.

at absolute zero temperature, entropy of a perfectly crystalline solid is zero

Among the given statements, correct statements is option (a). It is also known as third law of thermodynamics. But as the temperature is raised, molecules begin to vibrate. Hence, the entropy of the solid increases.


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5.

Equilibrium constants K1 and K2 for the following equilibria,

I. NO (g) + 12 O2 (g)  NO2 (g)

II. 2NO2 (g)  2NO (g) + O2 (g) are related as

  • K1K2

  • K21K1

  • K1 = 2K2

  • K21K12


6.

The shape of XeFis

  • square planar

  • distorted octahedral

  • square pyramidal

  • pyramidal


7.

CO is a stronger ligand than Cl-, because

  • CO is a neutral molecule

  • CO has π-bonds

  • CO is poisonous

  • CO is more reactive


8.

Which of the following sequence is correct regarding field strength of ligands as per spectrochemical series?

  • SCN- < F- < CN- < CO

  • F- < SCN- < CN- < CO

  • CN- < F- < CO < SCN-

  • SCN- < CO < F- < CN-


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9.

A liquid can exist only

  • between triple and critical points

  • at any temperature above melting point

  • between melting and critical points

  • between boiling and melting points


10.

The energy of electron in the nth Bohr orbit of H-atom is

  • -13.6n2 eV

  • -13.6n eV

  • -13.6n4 eV

  • -13.6n3 eV


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