Which from following elements in respective oxidation state develops highest spin only magnetic moment?

Which from following polymers is used as wool substitute?

Which from following compounds does NOT contain nitrogen in it?

A container contains $4 \mathrm{~g} \mathrm{H}_2, 4 \mathrm{~g} \mathrm{He}$ and certain amount of 'Ne' at a certain temperature. What is the mass of 'Ne' required so that the partial pressure exerted by 'Ne' is equal to the partial pressure of He ?