_________is heavy water
H2180
H2160
H203
D20
Para and ortho hydrogen differ in
atomic number
atomic mass
spins of protons
number of neutrons
Ortho and para hydrogen have
identical chemical properties but different physical properties
identical physical properties and chemical properties
identical physical properties but different chemical properties
different physical and chemical properties
Which of the following alkali metals have very low density.
Na
Cs
Li
K
In the extraction of lithium _________ is used as anode.
Ni
P+
Fe
gas - coke splinter
Deuterium nucleus consists of.
2 neutrons
2 protons only
One neutron only
One proton and one neutron
_______ is used as a propellant in nucleus.
H2O2
D2O
ND3
CH2 = CH2
The half life of tritium is
~ 13.2 years
~ 12. 3 years
~ 14. 3 years
~ 10 years
Alkali metals have low melting and boiling point due to the _______ in the crystal lattice.
Strong bonding
Weak bonding
High atomic weight
At room temperature ordinary hydrogen consists of about.
25% para and 75% ortho
75% para and 25% ortho
99% para and 1% ortho
1% para and 99% ortho