Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

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11.

The relation between H and E is :

  • E = H + nRT

  • H = E - nRT

  • H = E + nRT

  • E = H + nRT


C.

H = E + nRT

The relationship between H and E is
H = E + nRT


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12.

In which of the following process , maximum increase in entropy is observed ?

  • Melting of ice

  • Sublimation of naphthalene

  • Condensation of water

  • Dissolution of salt in water


13.

The basic structural. unit and its geometry in silicates is :

  • SiO2 , tetrahedral

  • SiO44- , square planar

  • SiO2 , square planar

  • SiO44- , tetrahedral


14.

Which of the following sets of quantum numbers is not possible ?

  • n = 4 , l =1 , m = 0 , s = + 12

  • n = 4 , l = 3 , m = - 3 , s = - 12

  • n = 4 , l = 1 , m = + 2 , s = - 12

  • n = 4 , l = 0 , m = 0 , s = - 12


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15.

Solubility product of a salt AB is 1 x 10-8 M in a solution in which the concentration of A+ ions is 10-3 M .The salt , will precipitate when the concentration of B- ions is kept :

  • between 10-8 M to 10-7 M

  • between 10-7 M to 10-8 M

  • > 10-5 M

  • < 10-8 M


16.

The pH of 10-8 M HCl solution is :

  • 8

  • more than 8

  • between 6 and 7

  • slightly more than 7


17.

For a reaction to be spontaneous at all temperatures ,

  • G and H till should be negative

  • G and H till should be positive

  • G = S = 0

  • H < G


18.

For a reversible reaction ;

X (g) + 3Y (g)  2Z (g) ; H = -40 kJ , the standard entropies of X , Y and Z are 60 , 40 and 50JK mol-1 respectively .The temperature at which the above reaction attains equilibrium is about :

  • 400 K

  • 500 K

  • 273K

  • 373K


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19.

+ I effect is shown by :

  • -CH3

  • -Br

  • -Cl

  • -NO2


20.

How many chiral carbonatoms are present in 2 , 3 , 4 - trichloropentane ?

  • 4

  • 1

  • 2

  • 3


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