Given the reaction below:

2cu + 8hno3 --> 3cu(no3)2 +2no + 4h2o

the mole ratio of no produced to hno3 reacted is

a. 4: 1

b. 1: 4

c. 2: 3

d. 2: 3

The given equation is  is

this is not balanced

The balanced equation will be:

Now as per it if we are using eight moles of HNO3 we are getting two moles of NO

so for each mole of NO we have to take four moles of HNO3

Hence the mole ratio of NO produced to HNO3 reacted will be = 1:4

the seeing the electronic configuration we can say that the element is fluorine.

fluorine is the most electronegative element in the periodic table.

but by only seeing the configuration we cannot say about its reactivity because we don't know if its configuration after excitation or by addition of electrons.

but if not then, it is the lightest halogen and exists as a highly toxic pale yellow diatomic gas at standard conditions. as the most electronegative element, it is extremely reactive: almost all other elements, including some noble gases, form compounds with fluorine.