Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

31.

In face centred cubic unit cell edge length is :

  • 43r

  • 42r

  • 2r

  • 32r


32.

If the Zn2+/Zn electrode is diluted to 100 times then the change in emf :

  • increase of 59 mV

  • decrease of 59 mV

  • increase of 29.5 mV

  • decrease of 29.5 mV


33.

Which of the following reactions end infinite time ?

  • Zero order

  • 1st order

  • 2nd order

  • 3rd order


34.

If equivalent conductance of 1 M benzoic acid is 12.8 ohm-1 cm and if the conductance of benzoate ion and H+ ion are 42 and 288 .42 ohm-1 cm2 respectively .Its degree of dissociation is :

  • 39 %

  • 3.9 %

  • 0.35 %

  • 0.039 %


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35.

If two substances A and B have PA° : PB° = 1 : 2 and have mole fraction in solution 1 : 2 then mole fraction of A in vapours :

  • 0.33

  • 0.25

  • 0.52

  • 0.2


36.

If an aqueous solution of glucose is allowed to freeze then crystal of which will be separated out first ?

  • Glucose

  • Water

  • Both (a) and (b)

  • None of these


37.

A + 2B  C + D , if

d[A]dt = 5 x 10-4 mol L-1 s-1 , then - d[B]dt is

  • 2.5 x 10-4 mol L-1 s-1

  • 50 x 10-4 mol L-1 s-1

  • 2.5 x 10-3 mol L -1 s-1

  • 1.0 x 10-3 mol L -1 s-1


38.

Which statement is wrong for NO ?

  • It is anhydride of nitrous acid

  • Its dipole moment is 0.22 D

  • It forms dimer

  • It is paramagnetic


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39.

There is no S-S bond in :

  • S2O42-

  • S2O52-

  • S2O32-

  • S2O72-


D.

S2O72-

In S2O72- ion the two sulphur atoms are linked through an oxygen atom .Each sulphur atom is further-linked with oxygen atoms .Its structure is :

In all other ions S-S bond is present


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40.

CuSO4 does not react with :

  • Fe

  • Ag

  • Zn

  • Mg


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