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For those who have chosen Cu for the last question, let me explain... Read the question carefully... It's asked about the element which "can" displace... So, Fe is above 'Hydrogen' in the reactivity series... So, it can displace... Had the question been , " The element which cannot displace H" , then the correct option would be "Cu"...👍
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Now the last question for Revision... From reactivity series part.... Let's see whether you guys know the reactivity series properly...
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The atomic radii of inert gases are____ than those of preceeding elements.
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The molecular mass will be 44.
After finding out the Molecular mass , you need to use the formula...
Molecular mass=2*Vapour density
