The mass of NaCl required to prepare 0.03 m aqueous solution in 1kg water is

Answer

A`to`q,r,t ; B`to`r,s,t ; C`to`p,q ; D`to`p,s,t

Explanation

(A)`Zn(OH)_2darr+4NH_3(aq)to[Zn(NH_3)_4](OH)_2` (colourless soluble complex)
`Zn(OH)_2darr+2NaOH(aq)toNa_2[Zn(OH)_4]` (colourless soluble complex)
`Zn(OH)_2 darr + 2H^(+)(aq)toZn^(2+)(aq)+2H_2O(l)`
(B)It is slightly soluble in red
`Cr(OH)_3darr+6NH_3(aq)to[Cr(NH_3)_6]^(3+)`(pink or violet soluble complex ) +`3OH^-`(aq)
`Cr(OH)_3darr+OH^(-)(aq)to[Cr(OH)_4]^(-)`(green soluble complex)
`2Cr(OH)_3darr+3Na_2O_2(s)to2Na_2CrO_4`(yellow solution) + 2NaOH (aq) +`2H_2O`(l)
`Cr(OH)_3darr+3H^(+)(aq)toCr^(3+)(aq)+3H_2O(l)`
(C )`AgCldarr+2NH_3(aq)to[Ag(NH_3)_]Cl`(colourless soluble complex)
`AgCldarr+2CN^(-)(aq)to[Ag(CN)_2]^(-)`(colourless soluble complex )+`Cl^-` (aq)
Does not dissolve in NaOH, `Na_2O_2` and 50% `HNNO_3`
(D)`2CuSdarr+8CN^(-)(aq)to2[Cu(CN)_4]^(3-)` (colourless soluble complex )+`S_2^(2-)`
`CuSdarr+Na_2O_2(s)overset(H_2O)toCuSO_4(aq)+NaOH(aq)`
CuS `darr`+ `H_2O `(l)`toCuSO_4(aq)`
`3CuSdarr+8HNO_3(aq)to3Cu^(2+)(aq)+6NO_3^(-)(aq)+3Sdarr+2NOuarr+4H_2O(l)`