How many of the following reagents can cause following reduction?

1) Sn+HCl
2) Fe+HCl
3) `H_2//Pd`
4) Raney Ni
5) Sn+`NH_4OH`

How many of the following can be oxidized by acid KMnO_(4) solution ? (1) Fe^(2+) (2) Ni^(2+) (3) Zn^(2+) (4) Sn^(2+)

How many of the following combination act as buffer (1) HCl+NaOH (2) CH_3COONa+CH_3COOH (3) H_2SO_4+Na_2SO_4 (4) H_2CO_3+NaOH (5) Na_2B_4O_7+H_3BO_3 (6) NH_4OH +NH_4Cl

Complete the following reaction: Sn+2KOH+4H_(2)Orarr ……+…….

With how many of the following reagents, H_(2)O_(2) act as reducing agent. MnO_(4)^(-) H^(+) ; MnO_(4)^(-) / OH^(-) , HOCl;I_(2) / OH^(-) ;[ Fe(CN)_(6)]^(3-) / OH^(-) ;PbS;],[ Fe^(2+) / H^(+) ; Cr^(3+) / OH^(-) ]

How many of the following salts are yellow in colour? Ag_(2)CrO_(4), PbO_(2), Bi_(2)S_(3), K_(4)[Fe(CN)_(6)], SnS_(2), CuO, Fe(OH)_(2)(CH_(3)COO) K_(3)[Co(NO_(2))_(6)], NaCrO_(2)

In which of the following reactions, oxidation and reduction take place ? (i) Zn to Zn^(2+)+2e^(-) (ii) Sn^(4+)+2e^(-) to Sn^(2+)