Phosphine reacts with which of the following without any change in the oxidation state of elements
(A) `CuSO_(4)`
(b) `HgCl_(2)`
(C) HBr
(D) `AlCl_(3)`

Which of the following element does not show -3 oxidation state.

In which of the following elements +3 oxidation state is more stable than +5 ?

Which of the following elements have +3 as most popular oxidation state?

Which of the following Lanthanides element do not show stable +4 oxidation state?

Which of the following elements shows maximum number of different oxidation states in its compounds ? (a)Eu (b)La (c)Gd (d)Am

For which of the following elements it is difficult to disproportionate in +3 oxidation state?

Which one of the following elements does exhibit +1 oxidation state as well ? AI, B, Ca, TI, Be.

Which of the following will be the most hydrated salt ? (1) NaCl (2) MgCl_2 (3) AlCl_3 (4) SiCl_4

Among the following, what is the total number of compounds having zero oxidation state of the underlined elements? a. ul(S)O_(3)^(2-) b. H_(2)ul(C )O c. ul(C )H_(2)Cl_(2) d. Na_(2)ul(cl_(2)) e. ul(O)_(3)

Among the following, what is the total number of compounds having zero oxidation state of the underlined elements? a. ul(S)O_(3)^(2-) b. H_(2)ul(C )O c. ul(C )H_(2)Cl_(2) d. Na_(2)ul(cl_(2))