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Yes, great, it worked!

Indeed, I was typing: Ctrl-M, \ce{ ... - and this gave always extra pair of braces.

Thank you, problem seem to be solved.

Thank you for the reply.
I uploaded lyx file and generated pdf file. In pdf no formating when I am using mhchem is kept, so all chemical formulas are not formatted.

Thanks for the reply.

No, unfortunately there are no subscripts neither in instant preview, nor in generated pdf (export by pdflatex).

If this is not a general problem in LyX, can it be the problem of Lyx installed in my system? If yes, what is the safest way to re-install Lyx in Ubuntu-based ...

I have a problem with writing chemical equations in LyX by using mhchem package. The package is working fine with LaTeX, for example in TexMaker that I have installed. However, in LyX mhchem does not format formulas at all: no superscripts, no subscripts, no arrows etc.

For example, \ce{H2O -> H2 ...