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

• O^2-

• F^-

• Li⁺

• B³⁺

Which of the following ions, has smallest size?

• Ca²⁺

• Cl^-

• S^2-

• K⁺

Yellow phosphorus is kept in

• water

• kerosene

• ether

• alcohol

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

Which will have maximum ionization energy?

• Na

• Mg

• K

• Bi

Lowest MP and BP is of

• Ar

• Xe

• He

• Ne

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

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

Best reagent for the conversion of AgNO₃ to Ag is

• HClO₄

• H₃PO₂

• HIO₄

• I₂