A radioactive substance disintegrate its 90% in 100 days. How much time it will take to disintegrate its 99.9% ?
100 days
200 days
300 days
400 days
The Modern Periodic Table is based on the properties of elements as a function of
atomic number
atomic mass
electronegatvity
electron affinity
A.
atomic number
Atomic number is the fundamental property of elements and Modem Periodic Table is based on it.
For the equilibrium reaction,
2SO2 (g) + O2 (g) 2SO3 (g) + H
the increase in temperature
favours the formation of SO3
favours the decomposition of SO3
does not affect the equilibrium
stops the reaction
What is the electronic configuration of O2- ion?
1s2, 2s2, 2p5, 3s1
1s2, 2s2, 2p4, 3s2
1s2, 2s2, 2p6
1s2, 2s2, 2p4
An organic compound containing C, H and N gives the following on analysis : C = 40%, H = 13.33% and N = 46.67%. What would be its empirical formula?
C2H7N
C2H7N2
CH4N
CH3N