" (vil) eax coshr "

Three coins are tossed once.Fmd the probability of getting (i) 3 heads (ii) 2 heads (iii) atleast 2 heads (iv) atmost 2 heads (v) no head (vi) 3 tails (vil) exactly two tails (vm) no tail (ix) atmost two tails

Write down the electronic configuration of: (i) Cr^(3+) (ii) p m^(3+) (iii) Cu^+ (iv) Ce^(4+) (v) CO^(2+) (vi) Lu^(1+) (vil) Mn^(2+) (viii) Th^(4+)

27g Al is discharged , when 0.5 A current is passed through molten AlCl^(3) . Calculate ( 1 ) the number of gram equivalents of Al discharged ( ii ) the number of gram atoms of Al discharged ( iii ) the number of molecules of Al discharged ( iv ) the number of electrons that took part in the process ( v ) the amount of electricity ( in F ) that was used ( vi ) the duration of passage of electricity ( vil ) the volume of Cl_(2) , ( in L ) produced at STP .