They are saying that every theory can eventually be changed a bit due to further research. It does not mean the theory is bad, just that it can become better.
Answer:
hydrogen, nitrogen, oxygen, fluorine, chlorine
For my opinion 2nd last statement is better
Answer:
The structure is shown in the figure.
Explanation:
There is condensation polymersiation in case of lactic acid with the removal of water molecule (dehydration) leading to formation of poly lactic acid.
The structure of PLA is shown in the figure.
Concentration of H+ ions in HNO3 solution is 10⁻¹ which is equal to 0.1 M
putting the value we get
So, the required option is A) 1