Definition: This is something that a citizen should do but is not required to do so by law. It is an obligation that a citizen fulfills voluntarily.

Example: Examples include being informed, voting, and volunteering

The fundamental duties of a citizen are not enforceable but are part of the constitution.

Explanation:

The fundamental duties of  citizen are their duties to the country of their residence as the citizens of that country.

These are directive principles and not enforced ones but a good citizen follows them and works on them to uphold the values of their government and the constitution of their country.

These include being an informed citizen, knowing one's voting rights and voting every time they are required to, volunteering for community service and much more.

question - in 1827, john walker, a druggist in a small english town, tipped a splint with sulphur, chlorate of potash, and sulphid of antimony, and rubbed it on sandpaper, and it burst into flame. the druggist had discovered the first friction-chemical match, the kind we use to-day. it is called friction-chemical because it is made by mixing certain chemicals together and rubbing them. although walker's match did not require the bottle of acid, nevertheless it was not a good one. it could be lighted only by hard rubbing, and it sputtered and threw fire in all directions. in a few years, however, phosphorus was substituted on the tip for antimony, and the change worked wonders. the match could now be lighted with very little rubbing, and it was no longer necessary to have sandpaper upon which to rub it. it would ignite when rubbed on any dry surface, and there was no longer any sputtering. this was the phosphorus match, the match with which we are so familiar. according the paragraph what was the benefit of the new phosphorus match? it burst into flame when rubbed on sandpaper. it was made by mixing chemicals. it could be ignited on any dry surface. it threw fire in all directions.

answer - matches required natural chemicals