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Question 25 ?

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Post by Nurul Alwani Thu Sep 02, 2010 8:30 am

i pick D for my answer but i dont get it right .
anyone ? how to know the salt name ? confused

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Post by airinah aziz Thu Sep 02, 2010 8:32 am

we share the same problem.
airinah aziz
airinah aziz

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Post by Admin Thu Sep 02, 2010 8:35 am

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.

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