Question

What is meant by semi molar and decimolar solution? Can I get example with chemicals like HCl and Na2CO3 or such like that?

Answer 1

semi molar means 1/2 Mand decimolar neans 1/10
yes

Answer 2

Semi Molar solution is the solution whose molarity is 1/2
where as
Decimolar solution is that solution when one tenth mole of a solute remains in one litre solution 
as you can also say that Decimolar solution means that the molarity of the solution is 1/10