Question

following chemical formulas.

1. cacl₂=
2. pbo=
3. v₂o₅=
4. ni₃o₃=
5. hg₂cl₂=
6. mno₄-=
7. cr₂o₇²-=

Explanation:

Step1: Identify the chemical formula

For \(CaCl_{2}\), \(Ca\) is calcium and \(Cl\) is chlorine. Since there are two \(Cl\) atoms, it's calcium chloride.

Step2: Identify the chemical formula

For \(PbO\), \(Pb\) is lead (in +2 oxidation state here) and \(O\) is oxygen. So it's lead (II) oxide.

Step3: Identify the chemical formula

For \(V_{2}O_{5}\), \(V\) is vanadium and \(O\) is oxygen. Using the naming for covalent compounds (since it's a molecular compound), it's vanadium (V) oxide or dipentoxide (but the former is more systematic).

Step4: Identify the chemical formula

For \(Ni_{3}O_{3}\), \(Ni\) is nickel (in +2 oxidation state as \(O\) is -2 and formula ratio is 1:1). So it's nickel (II) oxide (though the formula can be simplified to \(NiO\), but as given \(Ni_{3}O_{3}\) is nickel (II) oxide).

Step5: Identify the chemical formula

For \(Hg_{2}Cl_{2}\), \(Hg\) is mercury (in +1 oxidation state as \(Cl\) is -1 and there are two \(Hg\) and two \(Cl\)). So it's mercury (I) chloride.

Step6: Identify the ion

For \(MnO_{4}^{-}\), it's the permanganate ion.

Step7: Identify the ion

For \(Cr_{2}O_{7}^{2 - }\), it's the dichromate ion.

Answer:

1. Calcium chloride
2. Lead (II) oxide
3. Vanadium (V) oxide
4. Nickel (II) oxide
5. Mercury (I) chloride
6. Permanganate ion
7. Dichromate ion