Which group tends to form +1 ions ?

Group 1, the alkali metals

Explanation:

Its because there's one valence electron in their outermost shell, they just lose that one electron and boom, they're stable. Losing electrons would create cations, so the loss of one electron creates +1 ions

2h2o2--> 2h2o + o2

this reaction is of the spontaneous decomposition of hydrogen peroxide down into water and oxygen.

add 2 molecules of hydrogen peroxide and 2 molecules of water. since oxygen is naturally diatomic, the total number of atoms of each element is now the same on both sides of the equation so it is balanced.

this may not be entirely correct but let me know.

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