Question

1. Fill in the blanks :
(a) Dalton used symbol .............. for oxygen and ............. for hydrogen.
(b) Symbol represents ................... atom(s) of an element.
(c) Symbolic expression for a molecule is called ............
(d) Sodium chloride has two radicals. Sodium is a ............. radical while chlorid
(e) Valency of phosphorus in PC, is ........... and in PCI, is ...
() Valency of Iron in FeCl, is ............ and in FeCl, it is .......
(g) Formula of iron (III) carbonate is ...............
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Answer 1

Answer:

O - OXYGEN, H- HYDROGEN

1 ATOM

COMPOUND

NA₊, CL-

-4, +1

+1

FeCO3

Explanation:

Answer 2

1. Fill in the blanks:-

a) Dalton used symbol O for Oxygen and H for hydrogen.

b) Symbol represents one atom (s) of an element.

c) symbolic expression for a molecule is called molecular formula.

d) sodium chloride has two radicals. sodium is a basic radical while chloride is a acidic radical.

e) Valency of phosphorus in PC, is 3 and in PCl, is 4 .

f) valency of iron in FeCl2, is 2 and in FeCl_3, is 3 .

g) Formula of Iron (III) carbonate is Fe2(CO3)3.