The total number of lone pairs in `I_(3)^(-),I_(3)^(+),BrF_(5)` and `IF_(7)` are `a,b,c` and `d` respectively. What is `((a+b+c+d)/(2))`

Total number of lone pair of electrons in 3 I_(3)^(-) ion is

Total number of lone pair of electrons in I_3^- , ion is:

I) The total number of lone pairs at all the atoms in hex halides of sulphur is a II) The total number of lone pairs in O_(3) is b III) The total number of lone pairs in H_(2)S_(2)O_(8) is c IV) Bond order in O_(3) is d Then what is [(a+b+c)/(10)+2d]

The dipole moment of AX_(3), BX_(3)and CX_(3) are 1.5 D, 0.5 D and 0 D respectively. The possible shapes of molecules may be (consider C has no Lone pair) (A, B and C are more electronegative than X)

The hybridization of central atoms of compounds A, B, C and D are sp^(3)d, sp^(3), sp^(2) and sp respectively. If compounds A and D have same shape like I_(3)^(-) and compounds B and C have same shape like water structure. Then calculate value of "P+Q+R+S", where P, Q, R, and S are number of lone pairs on central atoms of compounds A, B, C and D respectively.

A library has a copies of one book, b copies each of two books, c copies each of three books, a single copy of d books. The total number of ways in which these books can be arranged in a shelf is equal to a. ((a+2b+3c+d)!)/(a !(b !)^2(c !)^3) b. ((a+2b+3c+d)!)/(a !(2b !)^(c !)^3) c. ((a+b+3c+d)!)/((c !)^3) d. ((a+2b+3c+d)!)/(a !(2b !)^(c !)^)

If (3a+5b):(3a-5b): :(3c+5d):(3c-5d) , then show that a,b,c and d are in proportion.