Question 25 ?
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Question 25 ?
i pick D for my answer but i dont get it right .
anyone ? how to know the salt name ?
anyone ? how to know the salt name ?
Nurul Alwani- Posts : 2
Join date : 2010-09-02
Age : 30
alwani
we share the same problem.
airinah aziz- Posts : 3
Join date : 2010-09-02
Age : 31
Location : seremban
Guide ofr Q25
Based on the colour of residue.
The residue is yellow when hot & white when cold.
It is the characteristics of zinc oxide
R must be zinc carbonate/zinc nitrate.
lead carbonate when is heated decomposed produce lead oxide & carbon dioxide
lead nitrate when is heated decomposed produce lead oxide, nitrogen dioxide & oxygen gas.
lead oxide is brown when hot & yellow when cold.
The residue is yellow when hot & white when cold.
It is the characteristics of zinc oxide
R must be zinc carbonate/zinc nitrate.
lead carbonate when is heated decomposed produce lead oxide & carbon dioxide
lead nitrate when is heated decomposed produce lead oxide, nitrogen dioxide & oxygen gas.
lead oxide is brown when hot & yellow when cold.
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