CBSE
Multiple Choice QuestionsThe geometry of XeF6 is
planar hexagon
regular octahedron
distorted octahedron
square bipyramid
What is the wave number of 4th line in Balmer series of hydrogen spectrum ? (R =1,09,677 cm-1)
24630 cm-1
24360 cm-1
24730 cm-1
24372 cm-1
In the electronic structure of H2SO4 , the total number of unshared electrons is
20
16
12
8
Which of the following has the maximum number of unpaired electrons?
V3+
Fe2+
Mn2+
Cu+
The de-Broglie wavelenght of a particle with mass 1 kg and velocity 100 m/s is
6.6 x 10-33 m
6.6 x 10-36 m
3.3 x 1033 m
3.3 x 10-36 m
A 600 W mercury lamp emits monochromatic radiation of wavelength 331.3 nm. How many photons are emitted from the lamp per second? (h = 6.626x 10-34 J-s; velocity of light = 3x108 ms-1)
1 x 1019
1 x 1020
1 x 1021
1 x 1023
The quantum numbers + and - for the electron spin represent
rotation of the electron in clockwise and anticlockwise direction respectively
rotation of the electron in anticlockwise and clockwise direction respectively
magnetic moment of the electron pointing up and down respectively
two quantum mechanical spin states which have no classical analogues
Which of the following relation is correct ?
Ist IE of C > Ist IE of B
Ist IE of C < Ist IE of B
IInd IE of C > IInd IE of B
Both (b) and (c)
Considering H2O as weak field ligand, the number of unpaired electrons in [Mn(H2O)6] will be (Atomic number of Mn = 25)
five
two
four
three
Heisenberg uncertainty principle can be explained as
