No. 1 kg of iron is not heavier than 1 kg of cotton.The reason is Even though cotton is softer and lighter than iron as per the given statement both iron and cotton are 1 kg. So both iron's and cotton's weight is equal. Both are equal.
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but what can you say about the buoyant force acting on them
if it's correct choose as best pls
both will be equal to each other but we feel wrong when we think that 1kg iron n 1kg cotton r equal this is becz of heavness of iron ,iron is in solid n cotton is in soft form that why we feel wrong

No it is not heavier.Because 1kg=1kg
only mass will change not its weight