Which among the following salt solution in water shows pH greater than 7?

What is the percentage of unoccupied volume in BCC structure?

What type of isomers are the ethoxy ethane and methoxy propane?

What is the value of $$\mathrm{\Delta H-\Delta U}$$ for the formation of 2 moles of ammonia from $$\mathrm{H_{2(g)}}$$ and $$\mathrm{N_{2(g)}}$$ ?