Chemistry

Misch metal consists of Lanthanide metal (? 95%) and iron (? 5%) and traces of S, C, Ca and Al.

Na? SO? + H? SO? → SO? + Na? SO? + H? O
SO? + 2NaOH → Na? SO? + H? O
Na? SO? + SO? + H? O → 2NaHSO?

For concentration cell E? cell = 0
Anode: Cu (s) → Cu²? (aq)?
Cathode: Cu²? (aq)? → Cu (s)
Overall: Cu²? (aq)? → Cu²? (aq)?
As ΔG = −nFEcell
If ΔG = -ve than Ecell is positive
Ecell = E? cell − (0.059/2) log (C? /C? )
Ecell = − (0.059/2) log (C? /C? )
Ecell > 0 ⇒ C? > C?

Relative lowering in vapour pressure depends on no. of mole of solute greater the no. of mole of solute greater in RLVP and smaller will be vapour pressure. So order of vapour pressure is B > C > A.

The chemical structure shown is 5-Amino-4- (hydroxymethyl)-2-nitrobenzene carbaldehyde.

(i) Ca (OH)? is used in white wash.
(ii) Plaster of paris is used in making of molds for plaster statues.
(iii) NaCl is used in preparation of washing soda.
(iv) A suspension of Mg (OH)? in water is used in medicine as an antacid under name of milk of magnesia.

(I) Lucas reagent → Only ZnCl? /Conc. HCl
(II) Dumas method → CuO/Δ
(III) Kjeldahl's method → Conc. H? SO? /Δ
(IV) Heinsberg reagent → C? H? SO? Cl/ aq. NaOH

For d? configuration if Δ? < P the electronic configuration is t? g eg