In case of hydrogen atom, there is no neutron. It consists of only one proton

The energy of photon is sufficient to disturb a sub-automic particle so that there  is uncertainty in the measurement of position and momentum of the sub-atomic particle. However the energy is insufficient to disturb a macroscopic object.

AIF₃ is an ionic compound whereas SiF₄ is a non-polar covalent compound. Hence, interparticle forces in AIF₃  are much stronger that's why it is a high melting solid.

One and two respectively.

A spontaneous process should occur continuously by itself after initiation. But this is not so in the given case because water will go up as long as the pump is working.

For the combination of N₂ and O₂ to form NO, the standard Gibbs energy of formation, is +ve
1/2N₂(g)+1/2O₂(g)→NO(g)(Δ_fG^∘NO = +86.7 kJmol⁻¹)
Therefore, this reaction is non-spontaneous under the standard conditions and hence N₂ and O₂ do not combine.

At the anode, loss of electrodes takes place, ie. oxidation takes place, whereas cathode, a gain of electrodes takes place, ie. reduction takes place.Therefore, the cathode is called reduction electrode and anode is called oxidation electrode.

E^o(Fe³⁺ I Fe²⁺)is lower than that of  E^o (Br I Br ^- ).Therefore, Fe²⁺ can reduce Br₂ bur Br ^- cannot reduce Fe³⁺. Thus, Fe³⁺  cannot oxidise Br ^- to Br₂