State, giving reasons, whether the substances printed in bold letters have been oxidised or reduced.
`PbO + CO to Pb + CO_2`

State, giving reasons, whether the substances printed in bold letters have been oxidised or reduced. H_2 S + Cl_2 to 2 HCl + S

State, giving reasons, whether the substances printed in bold letters have been oxidised or reduced. Mg + 2HCl to MgCl_2 + H_2

State, giving reasons, whether the substances printed in bold letters have been oxidised or reduced. Cl_2 + H_2S to 2HCI + S

State whether the compounds shown in bold letters are oxidised or reduced. Provide reasons also. CuO+H_2 to Cu+H_2O

State giving reason whether the following reaction would involve an increase, a decrease or no change in entropy. 4Fe(s) + 3O_2(g) to 2Fe_2O_3 (s)

State giving reasons which is a stronger acid - dil HCl or conc. H_(2)CO_(3)

Assertion :- In the reaction Zn(s)+cu^(+2)(aq)rarrZn^(+2)(aq)+Cu(s) Cu^(+2) ions act as oxidising agent and Zn atoms act as a reducing agent. Reason :- A substance when readily gain electrons from other, substance is an oxidising agent while reducing agent is a substance which can lose electrons to other susbtances.

The number of electrons donated from substance(s) getting oxidized to the substance(s) getting reduced in the chemical equaton for the following reaction is: Cr_2O_(7)^(2-) + Fe^(2+) + C_2O_(4)^(2-) rarr Cr^(3+) +Fe^(3+) + CO_2 (Unbalanced)

While charging the lead storage battery: (a) PbSO_(4) anode is reduced to Pb (b) PbSO_(4) cathode is reduced to Pb (c) PbSO_(4) cathode is oxidised to Pb (d) PbSO_(4) anode is oxidised to PbO_(2)

Name the substance oxidised and the substance reduced, and also identify the oxidising agent and reducing agents in the following reactions : (a) 3MnO_(2) +4Al to 3Mn +2Al_(2)O_(3) (b) Fe_(2)O_(3) + 3CO to 2Fe + 3CO_(2) (c) SO_(2) + 2H_(2)S to 3S +2H_(2)O