35 questions
The two electrons in an orbit are distinguished by
principal quantum number
angular momentum quantum number
spin quantum number
magnetic quantum number
A gas absorbs a photon of 355 nm and emits at two wavelengths. If one of the emissions is at 680 nm, the other is at:
518 nm
1035 nm
325 nm
743 nm
When the angular momentum number ,l=1,the shape of the orbital will be
spherical
dumbbell
double dumbbell
diffused
Consider the ground state of Cr atom (Z = 24). The numbers of electrons with the azimuthal quantum numbers, l = 1 and 2 are, respectively:
12 and 4
12 and 5
16 and 4
16 and 5
A body of mass 10 mg is moving with a velocity of 100 ms-1. The wavelength of de-Broglie wave associated with it would be (Note: h = 6.63 × 10-34 Js)
6.63 × 10-37 m
6.63 × 10-31 m
6.63 × 10-34 m
6.63 × 10-35 m
Which of the following statements does not form a part of Bohrs model of hydrogen atom?
a) Energy of the electrons in the orbit is quantised
The electron in the orbit nearest the nucleus has the lowest energy
Electrons revolve in different orbits around the nucleus.
The position and velocity of the electrons in the orbit cannot be determined simultaneously
A sub-shell with n = 6 , l = 2 can accommodate a maximum of
12 electrons
36 electrons
10 electrons
72 electrons
Maximum number of electrons in a sub-shell can be
4l + 2
4l –2
2n2
2l + 1
The ground state electronic configuration of Fe3+ is
[Ar]3d4 4s1
[Ar]3d3 4s2
[Ar]3d5 4s0
[Ar]3d6 4s2
Which of the following has non-spherical shells of electron
He
B
Be
Li
The orientation of atomic orbitals depends on their
spin quantum number
magnetic quantum number
azimuthal quantum number
principal quantum number
3p orbital has _____ radial nodes
3
2
1
0
What are the conditions for gas like Carbon monoxide to obey the ideal gas laws?
low temperature and low pressure
low temperature and high pressure
high temperature and low pressure
high temperature and high pressure
If 20cm³ gas at 1 atm. is expanded to 50 cm³ at constant T, then what is the final pressure?
20 × 150
50 × 120
1 × 120 × 50
None of these
The law, which states that at constant temperature, the volume of a given mass of gas is inversely proportional is pressure, is known as:
Boyles law
Charles law
Avogadro's law
Combined gas law
Which among the following exhibit weakest inter molecular forces
NH3
HCl
He
H2)
The vapour pressure of water at 300K in a closed container is 0.4 atm,If the volume of the container is doubled,its vapour pressure at 300K will be
0.4 atm,
0.8 atm,
0.2 atm,
0.6 atm,
Alkali metals react with water vigorously to form hydroxides and dihydrogen. Which of the following alkali metals reacts with water least vigorously?
Li
Na
K
Cs
The reducing power of a metal depends on various factors. Suggest the factor which makes Li, the strongest reducing agent in aqueous solution.
Sublimation enthalpy
Ionisation enthalpy
Hydration enthalpy
Electron-gain enthalpy
Which of the carbonates given below is unstable in air and is kept in CO2 atmosphere to avoid decomposition.
Metals form basic hydroxides. Which of the following metal hydroxide is the least basic?
Mg(OH)2
Ca(OH)2
Sr(OH)2
Ba(OH)2
Some of the Group 2 metal halides are covalent and soluble in organic solvents. Among the following metal halides, the one which is soluble in ethanol is
BeCl2
MgCl2
CaCl2
SrCl2
Which of the ions have maximum hydration energy?
Which oxide is amphoteric?
BaO
CaO
BeO
MgO
Be shows the diagonal relationship with
Na
Mg
Al
B
The tendency to lose their valance electron easily by alkali metals makes them
weak oxidising agent
strong oxidising agent
weak reducing agent
strong reducing agent
Which is not the correct statement for Boron?
It forms volatile hydrides.
It forms solid chlorides
It exists in both crystalline and Amorphous form
It exhibits Allotropy
Which of the following oxidation states are most characteristic for lead and tin respectively
4, 4
2, 4
4, 2
2, 2
In general, the Boron Trihaides act as a
Dehydrating Agents
Lewis Bases
Lewis Acids
Strong reducing agent
Find the amphoteric oxid
CaO
Which is the correct order of decreasing acidity of lewis acids?
(a) BBr3 > BCl3 > BF3
(b) BF3 > BCl3 > BBr3
(c) BCl3 > BF3 > BBr3
(d) BBr3 > BF3 > BCl3
BBr3 > BF3 > BCl3
BCl3 > BF3 > BBr3
BF3 > BCl3 > BBr3
BBr3 > BCl3 > BF3
Which of the species has a permanent dipole moment?
Among the following , which is the strongest oxidising agent?
all alkali metals are strong
acids
bases
the compounds of alkaline earth metals have the following magnetic nature
Diamagnetic
Paramagnetic
Ferromagnetic
Antiferromagnetic