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ICSE Class 10 Chemistry 2018 Solved Paper

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State one relevant observation for each of the following :
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Question : 20
Total: 80
Lead nitrate solution is treated with sodium hydroxide solution drop wise till it is in excess.
Solution:  
A chalky white ppt of lead hydroxide [Pb(OH)2] is obtained which dissolves in excess NaOH forming a clear colourless solution of sodium plumbate [Na2PbO2] .
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