1.
The oxidation state of Cr in Cr (CO)6 is
A
0
B
2
C
4
D
6
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The oxidation state of Cr in Cr (CO)6 is
0
2
4
6
The pH is defined as
logarithm of hydroxide ion concentration
negative logarithm of hydrogen ion concentration.
negative logarithm of hydroxide ion concentration
only hydrogen ion concentration
All noble gases are ?
colourless
odourless
colourless and odourless
colourless and but have odour
Number of water molecules in the drop of water,if 1 ml of water has 20 drops and A is Avogadros number, is
0.5A/18
0.05A (C)0.5A
0.05A/18
Metals tend to......................electrons and nonmetals tend to......................electrons.
lose, lose
lose, gain
gain, lose
gain, gain
One of the following chemical acts as both coagulant and softening agent
Lime
soda
alum
sodium aluminate
During electrolysis, anions undergo
reduction, anode
reduction, cathode
oxidation, anode
oxidation, cathode
The number of electrons in 3d sub shell for element with atomic number 26 is
4
6
8
10
The correct set of four quantum numbers for valence electron of Rubidium(37) is
5, 1, 1, +1/2
5, 0, 0, +1/2
6, 0, 0, +1/2
5, 1, 0, +1/2
The maximum number of electrons in a sub shell with, l=3 and n=4 is
14
16
10
12
The line spectrum of He+ ion will resemble that of
Hydrogen atom
Helium atom
Li+ ion
Lithium atom
Deuterium nucleus contains
1p+1n
2p+0n
1p+1e
2p+2n
Which of the following ion have electronic configuration; {Ar} 3d6?
Ni+3
Mn+3
Fe3+
Co+3
The measurement of the electron position is associated with an uncertainty in momentum which is equal to 10-18 g cm /s. The uncertainty in electron velocity(cm/s) is; (me = 9.1 x 10-28 g)
What is the maximum of electrons in an atom that can have the quantum numbers, n=4, ml=+1?
4
15
3
6
The orientation of an atom is governed by
Principle quantum number
Spin quantum number
Azimuthal quantum number
Magnetic quantum number
The energy of second Bohrs orbit of hydrogen atom is -328 kj/mol. Hence the energy of fourth orbit would be
-41 kj/mol
-164 kj/mol
-82 kj/mol
-1312 kj/mol
For principle quantum number n=4, the number of orbitals having l=3 is
3
7
5
9
The value of Planks constant is 6.62 x 10-34 js. The velocity of light is 3 x 108 m/s. which value is closest to the wavelength in nanometers of a quantum of light with frequency of 8 x 1015 s ?
40
5 x 10-18 3 x 107
The quantum number m of a free gaseous atom is associated with
The effective volume of the orbital
The spatial orientation an orbital
The shape of orbital
the energy of the orbital in the absence of the magnetic field