Which statement is incorrect concerning the formation of ionic compounds? a Halogens tend to form anions with a charge of -1.
b. Alkali metals tend to form cations with a charge of +1.
c. Metals tend to form cations, while nonmetals tend to form anions.
d. Transition metals tend to form cations with a charge of +3.
e. Noble gases tend not to form ionic compounds.

d. Transition metals tend to form cations with a charge of +3.

Explanation:

Which statement is incorrect concerning the formation of ionic compounds?

a. Halogens tend to form anions with a charge of -1.  TRUE. Halogens have 7 electrons in their valence shell, so they tend to gain 1 electron to fill their octet.

b. Alkali metals tend to form cations with a charge of +1.  TRUE. Alkali metals have 1 electron in their valence shell, so they tend to lose 1 electron to fill their previous octet.

c. Metals tend to form cations, while nonmetals tend to form anions.  TRUE. Metals have low electronegativity while nonmetals have high electronegativity.

d. Transition metals tend to form cations with a charge of +3.  FALSE. Transition metals form cation with numerous charges.

e. Noble gases tend not to form ionic compounds. TRUE. Noble gases are very stable because their octet is full.

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