(i) Explain Soddy and Fajan Radioactive displacement law.
(ii) Calculate the ph of `0.05MH_2SO_4`.

Explanation

Alpha decay :
(a) Unstable parent nucleus emits an alpha particle to form stable daughter nucleus.
(b) `""_(92)U^(238)rarr ""_(90)Th^(234)+""_2He^4(alpha-"decay")`
(c) Mass number decreases by 4.
(d) Atomic number decreases by 2.
Beta decay :
(a) Unstable parent nucleus emits a beta particle to form stable daughter nucleus .
(b) `""_15P^(32)rarr_(16)S^(32)+_(-1)e^(theta)(beta-"decay")`
(c) Mass number - no change
(d) Atomic number increased by 1.
Gamma decay:
(a) The atomic number and the mass number remain same .
(b) Te energy level of the nuceleus change.
`[H^+]` = Normality = Molarity `xx` basicity
`=0.05xx2 = 0.1`
`=10^(-1)= 1 xx10^(-1)`
`pH = -log _(10) [H^+]`
`pH = -log _(10) 1 xx 10^(-1)`
`pH = - log _(10)1 - log _(10) 10^(-1)`
`pH = 0-(-1log_(10)10)=1`