Which of the following are correct?
(i) 
liberates hydrogen from a dilute acid
(ii) The earlier members of lanthanide series behave more like aluminium
(iii) The 'silver' UK coins are made of 
alloy
(iv) The maximum oxidation state exhibited by Neptunium is +7
Text Solution
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is a strong reducing agent and liberates hydrogen from a dilute acid. Thus, (i) is correct. In chemical behaviour, the earlier members of the lanthanide series behave more like calcium. Thus, (ii) is incorrect. Silver UK coins 
alloy.
Thus, (iii) is correct. Neptunium ( 
) belongs to the actinides series and has the configuration 
because of which it can show a maximum of +7 oxidation state. Thus, (iv) is correct.
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