CBSE
Yellow phosphorus is kept in
water
kerosene
ether
alcohol
Which of the following ions has the highest value of ionic radius:
O2-
F-
Li+
B3+
Lowest MP and BP is of
Ar
Xe
He
Ne
Which of the following ions, has smallest size?
Ca2+
Cl-
S2-
K+
Which of the following electronic configuration represents noble gas?
ns2np6
ns2np5
ns2np4
ns2np3
Which will have maximum ionization energy?
Na
Mg
K
Bi
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
The incorrect configuration is
K = [Ar] 4s1
Cr= [Ar] 3d5 ,4s1
Cr= [Ar] 3d4 , 4s1
Cu= [Ar]3d10 ,4s1
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
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