Wave nature of electrons was demonstrated by :
Schrodinger
De-Broglie
Davisson and Garmer
Heisenberg
A gas can expand from 100 mL to 250 mL under a constant pressure of 2 atm .The work done by gas is :
30.38 joule
25 joule
5 k joule
16 joule
If the r.m.s. speed of a gaseous molecule is x m/sec at a pressure P atm , then what will be the r.m.s. speed at a pressure 2P atm and constant temperature ?
x
2x
4x
x/4
How does the ionisation energy of 1st group elements vary ?
Increases down the group
Decreases down the group
Remains unchanged
Variation is not regular
What type of hybridisation takes place in the N atom of NH3 ?
sp2
sp3
dsp2
sp
B.
sp3
In NH3 , the N atom contains one lone pair of electrons and three bond pairs in its valence shell .So It shows sp3 hybridization .
Due to presence of one lone pair of electron , its shape deviate from tetrahedral because lone pair shows more repulsion than bond pairs .
As.
l.p - l.p. > l.p. - b.p. > b.p. - b.p.
So its shape is pyramidal and angle 107° .