State the valency in each case and name the following elements or radicals given below. First two have been done for you.
1 K [ Ans : K¹ - potassium ]
2 Cr₂O₇ [ Ana : Cr₂O₇²⁻ - dichromate ]
3 Cl
4 Ni
5 ClO₃
6 CO₃
7 Ba
8 HCO₃
9 NO₂
10 Na
11 Br
12 Zn
13 Mg
14 O
15 Co
16 CrO₄
17 ClO
18 MnO₄
19 Li
20 I
21 OH
22 O₂
23 ZnO₂
24 SiO₃
25 NO₃
26 SO₃
27 SO₄
28 PO₄
29 N
30 C
31 PO₃
32 Al
33 Ca
34 H
35 PbO₂
36 HSO₃
37 AlO₂
38 Cr
39 HSO₄
40 NH₄
Answers
Let us see the answers one by one :
(3) Cl means chlroine whose valency is 1- but chlorine, however exhibits variable valencies of 1,3,5,7.
(4) Ni means nickel whose valency is 2.
(5) ClO3 means chlorate whose valency is 1. Chlorate is an electronegative ion.
(6) CO3 represents ciarbonate which has a negative valency of 2, that is its valency is 2 and it is an electronegative ion.
(7) Ba means barium whose valency is 2.
(8) HCO3, is an electronegative ion which means bicarbonate (or hydrogen carbonate) whose valency is 1.
(9) NO2 means nitrite whose valency is 1. The valency is negative (1-).
(10) Na has a positive valency of 1. It is sodium.
(11) Br is bromine having a valency of 1 (negative valency).
(12) Zn is zinc whose valency is 2.
(13) Mg is magnesium whose valency is 2.
(14) O is oxide radical whose valency is 2, and its negative that is 2-
(15) Co or cobalt can have variable valencies of 2,3,4.
(16) CrO4 or chromate has a valency of 2 and it is negative valency (that is 2-).
(17) ClO or hypochlorite has a valency of 1 (negative valency).
(18) MnO4 also called permanganate has a valency of 1 (negative valency).
(19) Li has a valency of 1+
(20) I or iodine has a valency of 1-
(21) OH or hydroxide ion has a valency of 1- that is negative valency.
(22) O2 that is peroxide ion has a valency of 2-
(23) ZnO2 or zincate has a valency of 2-
(24) Sio3 or silicate has a valency of 2-
(25) NO3 or nitrate has a valency of 1-
(26) SO3 or sulphite has a valency of 2-
(27) SO4 or sulphate has a valency of 2-
(28) PO4 or phosphate has a valency of 3-
(29) N or nitrogen has a valency of 3.
(30) C or carbon has a valency of 4.
(31) PO3 or Phosphite ion has a valency of 3-
(32) Al or aluminium is trivalent electropositive that is its valency is 3+
(33) Ca or calcium has a valency of 2+
(34) H or hydrogen has a valency of 1+
(35) PbO2 or plumbite has a valency of 2-
(36) HSO3 or bisulphite or hydrogen sulphite has a valency of 1-
(37) AlO2 or meta-aluminate has a valency of 1-
(38) Cr or chromium has a valency of 3+
(39) HSO4 or bisulphate or hydrogen sulphate has a valency of 1-
(40) NH4 or ammonium has a valency of 1+
Answer:
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