Which element can form a chloride with a general formula of MCl2 or MCl3?

Question

Which element can form a chloride with a general formula of MCl2 or MCl3? Options: Fe, Al, Mg, Zn.
Which equation is correctly balanced? 
1. H2 + O2 → H2O 
2. Ca + Cl2 → CaCl2 
3. H2 + O2 → 2H2O 
4. Ca + Cl2 → Ca2Cl
The oxide of metal X has the formula XO. Which group in the Periodic Table contains metal X? Options: Group 1, Group 2, Group 13, Group 17.
What is conserved during a chemical reaction? Options: mass only, charge only, both mass and charge, neither mass nor charge.
What is the chemical formula for nickel (II) hypochlorite? Options: NiCl2, Ni(ClO)2, NiClO2, Ni(ClO)3.
An unknown element X can form a compound with the formula XBr3. In which group on the Periodic Table would element X be found? Options: 12, 13, 14, 15.
Given the reaction: Mg(s) + 2 AgNO3(aq) → Mg(NO3)2(aq) + 2 Ag(s), which type of reaction is represented? Options: single replacement, double replacement, synthesis, decomposition.
Thank you!

Anonymous · Accepted Answer

1. Iron! Fe +2 or Fe+3
(because it can form different ions in different cases)
3 2H2+O2->2H2O
there are four hydrogens and two oxygens on each side, so it's balanced
2 group 2
oxygen forms a -2 ion so it would form a 1 to 1 ionic compound with elements that form +2 ions, which are found in the second family of the periodic table.

3 mass and charge
I think it's 2 but you can double check that by searching "nickel (II) hypochlorite" in google
3 13 (or 3A) because they have a +3 charge
it looks like a single replacement reaction. don't forget the arrow in the middle.

I really hope you've tried all these before asking about them

Anonymous · Answer

Very interesting.

Anonymous · Answer

I really can't answer yer question..but r u in agora?

Anonymous

Which element can form a chloride with a general formula of MCl2 or MCl3?

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