Can someone help me with Q4 MCQ? I would like to have an explanation pls. Thanks, will mark brainliest.

B

Explanation:

The ratios of the coefficient of the compounds in a balanced chemical equation tells us the relationship of each compound to the others in terms of mole.

Based on the equation,

3 moles of CO₂ would require 2 moles of phosphoric acid.

3 mol CO₂ ------- 2 mol H₃PO₄

1.5 mol CO₂ ------- 2 ÷2= 1 mol H₃PO₄

Or 1.5 mol would require mol of  H₃PO₄

To find mass of  H₃PO₄, multiply the number of moles by its Mr, which can be deduced with the help of the periodic table.

Ar of  H₃PO₄

= 3(Ar of H) + Ar of P +4(Ar of O)

= 3(1) +31 +4(16)

= 98

Multiply 98 with the number of moles, 1, to obtain the answer.

So if you would look at the steps above, here's what we did:

Detail is given below.

Explanation:

Atomic radius  trend along period:

As we move from left to right across the periodic table the number of valance electrons increases. The atomic size tend to decrease in same period of periodic table because the electrons are added with in the same shell. When the electron are added, at the same time protons are also added in the nucleus. The positive charge is going to increase and this charge is greater in effect than the charge of electrons. This effect lead to the greater nuclear attraction. The electrons are pull towards the nucleus and valance shell get closer to the nucleus. As a result of this greater nuclear attraction atomic radius decreases and ionization energy increases because it is very difficult to remove the electron from atom and more energy is required.

we can see in picture A there is one positive charge and force of attraction is 2.30×10⁻⁸ N

In picture D there are 2 positive charge and force of attraction is 4.60×10⁻⁸ N

So by increasing the positive charge force of attraction also increases.

In F we can see there is more positive charge thus force of attraction is also greater.