How do ionic bonds affect the properties of ionic compounds?

the bonds weakly hold ions together, increasing the melting point.
the bonds strongly hold ions together, reducing the boiling point.
the bonds prevent ions from moving throughout the crystal, so a solid ionic compound is a poor conductor.
the bonds prevent electrons from moving throughout the crystal, so a solid ionic compound is a poor conductor.

The correct answer is :

The bond prevent ions from moving throughout the crystal, so a solid ionic compound is a poor conductor.

The explanation:

1- the bonds prevent electrons from moving, since the ions are locked in place and don't want their electrons to go.

2- Ionic substances form giant ionic lattices containing oppositely charged ions.

3- They have high melting and boiling points

4- conduct electricity when melted or dissolved in water.

b.

the accuracy of the data.

as given the equation is

2al + 6 hcl > 2 alcl3 + 3 h2(g)

as per equation two moles of aluminum reacts with six moles of hcl to give two moles of alcl3 and three moles of hydrogen gas

given: three moles of al are present and 7 moles of hcl

for three moles of aluminum nine moles of hcl will be required

however as 7 moles of hcl are present so the limiting reagent is hcl

hcl is going to decide the number of moles of product formed

when six moles of hcl are present = 3 moles of h2 are formed

when one mole of hcl is present == 3/6 mole sof h2 will be formed

when 7 moles of hcl are present = 3 x 7/ 6 moles of h2 will be formed = 3.5 moles of h2