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Question

Write the chemical formula of the compound iron [II] hydroxide in a step-by-step manner.


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Solution

The symbol of iron is ‘Fe’, having a valency of 2+.

The symbol of the formula is ‘OH’ with valency 1-.

Step 1 –

Write the formula of iron [II] hydroxide:

Symbol Valency

Iron Fe 2+

Hydroxide OH 1-

Step 2 –

Write each symbol with its valency:

Fe2+ OH1-

Step 3 –

Interchanging the valencies:

FeOH2+1-

The formula of the compound iron [II] hydroxide is Fe(OH)2.


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