Find the valency of each element mentioned in the following substances-i- Aluminium in - Al-2-SO-4-3- ii- Lead in - PbO-2- iii- Calcium in - CaO- -160-iv- Nickel in - NiCO-3- -160-v- Barium in - BaSO-3- vi- Iron in - FeCl-2- -160-vii- Iron in - FeCl-3- -160-viii- Gold in - AuCl-3- ix- Cobalt in - Co-NO-3-3- -160-x- Tin in - Sn-SO-4 -2-

(i) In (SO_4)^2 , valency of S=+6 and that of O= 2 ; #160; #160; In Al_2(SO_4)_3 , valency of Al=+3 .(ii) In PbO_2 , vale ...

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Byju's Answer

Standard IX

Chemistry

Ionic Compounds: Chemical Formula

Find the vale...

Question

Find the valency of each element mentioned in the following substances:
i) Aluminium in $A l_{2} (S O_{4})_{3}$ ii) Lead in $P b O_{2}$ iii) Calcium in $C a O$
iv) Nickel in $N i C O_{3}$ v) Barium in $B a S O_{3}$ vi) Iron in $F e C l_{2}$
vii) Iron in $F e C l_{3}$ viii) Gold in $A u C l_{3}$ ix) Cobalt in $C o (N O_{3})_{3}$
x) Tin in $S n (S O_{4})_{2}$

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Solution

(i) In $(S O_{4})^{2 -}$ , valency of $S = + 6$ and that of $O = - 2$ ;
In $A l_{2} (S O_{4})_{3}$ , valency of $A l = + 3$ .
(ii) In $P b O_{2}$ , valency of $P b = + 4$ and that of $O = - 2$ .
(iii) In $C a O$ , valency of $O = - 2$ , hence valency of $C a = + 2$ .
(iv) In $N i C O_{3}$ , by charge balance, valency of $N i = + 2$ ;
In $(C O_{3})^{2 -}$ , valency of $C = + 4$ and that of $O = - 2$ .
(v) In $B a S O_{3}$ , there is $(S O_{3})^{2 -}$ ion, hence valency of $B a = + 2$ ;
In $(S O_{3})^{2 -}$ , valency of $S = + 4$ and that of $O = - 2$ .
(vi) In $F e C l_{2}$ , there are $2 C l^{-}$ ions, hence valency of $F e = + 2$ , valency of $C l = - 1$ .
(vii) $F e C l_{3}$ has $3 C l^{-}$ ions, valency of $F e = + 3$ and that of $C l = - 1$ .
(viii) $A u C l_{3}$ has $3 C l^{-}$ ions, hence valency of $A u = + 3$ and that of $C l^{- 1}$ .
(ix) $C o (N O_{3})_{3}$ has $3 (N O_{3})^{-}$ ions, hence valency of $C o = + 3$ ;
In $(N O_{3})^{-}$ , valency of $N = + 5$ and that of $O = - 2$ .
(x) $S n (S O_{4})_{2}$ has $2 (S O_{4})^{2 -}$ ions, hence valency of $S n = + 4$ ;
In $(S O_{4})^{2 -}$ , valency of $S = + 6$ and that of $O = - 2$ .

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Find the valency of each element mentioned in the following substances:i) Aluminium in Al2(SO4)3 ii) Lead in PbO2 iii) Calcium in CaO iv) Nickel in NiCO3 v) Barium in BaSO3 vi) Iron in FeCl2 vii) Iron in FeCl3 viii) Gold in AuCl3 ix) Cobalt in Co(NO3)3 x) Tin in Sn(SO4)2