Question

names are
called trivial or common names, and they are widely
formula NO,, we find that the valency of
nitrogen is 4
EXCERCISE 1(A)
1. What is a symbol? What information does it convey?
2. Why is the symbol S for sulphur, but Na for sodium and Si
for silicon?
3. Write the full form of IUPAC. Name the elements
represented by the following symbols :
Au, Pb, Sn, Hg.
4. If the symbol for Cobalt, Co, were written as CO, what
would be wrong with it?
5. What do the following symbols stand for?
(a) H
(b) H
(c) 2H
(d) 2H
6. What is meant by atomicity ? Name a diatomic element.
7. (a) Explain the terms 'valency' and 'variable valency'.
(b) How are the elements with variable valency named ?
Explain with an example,
8. Give the formula and valency of
(a) aluminate
(b) chromate
(c) aluminium
(d) cupric
9. (a) What is a chemical formula ? (b) What is the
significance of a formula ? Give an example to illustrate.
10. What do you understand by the following terms?
(a) Acid radical (b) Basic radical
11. Select the basic and acidic radicals in the following
compounds.
(a) MgSO
(b) (NH),SO
(c) Al(SO)
(d) ZnCo
(e) Mg(OH),
12. Write chemical formulae of the sulphates of Aluminium,
Ammonium and Zinc
13. The valency of an element A is 3 and that of element B
is 2. Write the formula of the compound formed by the
combination of A and B.
.
EE​

Answer 1

Answer:

காலை வணக்கம் ரிஷி ராக்ஸ் என்று கூறியுள்ளார் கருணாநிதி கூறியுள்ளார் கருணாநிதி கூறியுள்ளார். இந்த நிலையில் இன்று அதிகாலை, . ஆனால், அவர் ஒரு நல்ல மனிதர். . . ஆனால் இந்த முறை ஒரு. . ஆனால்

Answer 2

Explanation:

5) 2h I know only that sorry ....