Glycosidic linkage between C₁ of $$\alpha$$-glucose and C₂ of $$\beta$$-fructose is found in

In base vs. acid titration, at the end point methyl orange is present as

56.0 L of nitrogen gas is mixed with excess hydrogen gas and it is found that 20 L of ammonia gas is produced. The volume of unused nitrogen gas is found to be _________ L.

When the excited electron of a H atom from n = 5 drops to the ground state, the maximum number of emission lines observed are _____________.