Question

3. Show number of bonds in:
(i) ethene molecule (ii) ethyne molecule
4. An element A has 1 electron in its first shell. It combines
with element B having 7 electrons in its third shell. What
type of bond is formed ?
5. Match the atomic numbers 4, 8, 10, 15 and 19 with each of
the following:
(a) Element which can form trivalent ion.
(b) An element with 4 shells.
(c) Element with 6 valence electrons.
(d) Element which does not form ion.
6. If electrons are getting added to an element Y; then
(a) is Y getting oxidized or reduced ?
(b) what charge will Y migrate to during the process of
electrolysis ?
7. (a) Elements X, Y and Z have atomic numbers 6, 9 and
12 respectively. Which one :
(i) forms an anion, (ii) forms a cation,
(b) State the type of bond between Y and Z and give its
molecular formula.
8. Taking MgCl, as an example of electrovalent bond, CCI.
as a covalent bond, give a difference between electrovalent
and covalent bonds.
9. Potassium chloride is an electrovalent compound, while
hydrogen chloride is a covalent compound. But, both
conduct electricity in their aqueous solutions. Explain.
Ans. : Both have free mobile ions in their aqueous state
10. Name two compounds that are covalent when taken pure
but produce ions when dissolved in water.
Ans. : Ammonia and HCI
11. An element M burns in oxygen to form an ionic compound
MO. Write the formula of the compounds formed if this
element is made to combine with chlorine and sulphur
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Answer 1

Explanation:

Atoms of an element combine in small numbers to form molecules. Atoms ... It combines with clement B having 7 electrons in its third shell.