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Chemistry Doubts: IGCSE Paper 3

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4 a)ii) this is precipitation any soluble zinc salt like for example: zinc nitrate+sodium carbonate= zinc carbonate+ sodium nitrate.
4 b) Fe+ 3OH= Fe(OH)3 doesnt need explanation
ii) i dont know why srry
ok thanks
do you know the answers for a)iii and b)iii ?
 
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