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 Multiple Choice QuestionsMultiple Choice Questions

441.

Which of the following ions has the highest value of ionic radius:

  • O2-

  • F-

  • Li+

  • B3+


442.

Which of the following ions, has smallest size?

  • Ca2+

  • Cl-

  • S2-

  • K+


443.

Yellow phosphorus is kept in

  • water

  • kerosene

  • ether

  • alcohol


444.

The decreasing nucleophilicity of the following is:

I. CH3S-              II. CH3O-

III. -OH               IV. EtO-

  • II > III > 1V > I

  • III > IV > I > II

  • IV > III > I > II

  • II < I < IV < III


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445.

Which will have maximum ionization energy?

  • Na

  • Mg

  • K

  • Bi


446.

Lowest MP and BP is of

  • Ar

  • Xe

  • He

  • Ne


447.

When H2S gas is passed in a metal sulphate solution in presence of NH4OH, a white precipitate is produced. The metal is identified as

  • Zn

  • Fe

  • Pb

  • Hg


448.

Which of the following electronic configuration represents noble gas?

  • ns2np6

  • ns2np5

  • ns2np4

  • ns2np3


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449.

The correct order of ionisation energy of C, N, O, F is :

  • F < 0 < N < C

  • F < N < C < 0

  • C < N < 0 < F

  • C < 0 < N < F


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450.

Best reagent for the conversion of AgNO3 to Ag is

  • HClO4

  • H3PO2

  • HIO4

  • I2


B.

H3PO2

H3PO2 is a good reducing agent as it contains two P-H bonds and thus reduces AgNO3 to Ag.

4AgNO3 + H3PO2 + 2H2 4Ag  + H3PO4 + 4HNO3


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