Redox Reactions

Choose the RIGHT statement

• in a redox reaction, there must be addition or removal of oxygen

• the nature of redox reaction is the increase of element's oxidation number

• if the oxidation number of an element changes, it is a redox reaction

• an oxidising agent is oxidised in a redox reaction

Which particles DOES NOT have reducing power?

• chloride ion

• hydrogen ion

• chlorine water

• hydrogen gas

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which compound has manganese with oxidation number +6?

• $K_2MnO_4$

• $KMnO_4$

• $MnO_{2\ }$

• $MnCl_{2\ }$

Which one below is BOTH oxidising agent and reducing agent?

• $Na$

• $SO_{2\ }$

• $Cl_{2\ }$

• $CO_{2\ }$

Tags

NGSS.HS-PS1-2

In which reaction below, the oxidation number of nitrogen changes from +5 to +2?

• $2NO+O_2\longrightarrow2NO_{2\ }$

• $N_2+3Mg\longrightarrow Mg_3N_2$

• $4NH_3+5O_2\longrightarrow4NO+6H_2O$

• $Cu+4HNO_3\longrightarrow Cu\left(NO_3\right)_{2\ }+2NO+2H_2O$

Which one below is redox reaction?

• $CaCO_3+2HCl\longrightarrow CaCl_2+CO_2+H_2O$

• $CaO+H_2O\longrightarrow Ca\left(OH\right)_2$

• $SO_2+2H_2S\longrightarrow3S+2H_2O$

• $NaCl+AgNO_3\longrightarrow AgCl+NaNO_3$

Tags

NGSS.HS-PS1-2

The correct description about redox reaction is

• Oxygen is definitely present

• The oxidising agent itself carries out oxidation

• Oxidation takes place before reduction

• Electron transfer definitely takes place

Tags

NGSS.HS-PS1-2

The basis of redox reactions is the

• change in oxidation numbers

• recombination of atoms in molecules

• loss, gain, or bias of electrons

• gain or loss of oxygen atom

Tags

NGSS.HS-PS1-2

Bordo mix that is used in agriculture cannot be held in an iron container because iron reacts with the copper (II) sulphate. In the reaction, iron

• is an oxidising agent

• is a reducing agent

• has a decrease in oxidation number

• is reduced

Tags

NGSS.HS-PS1-2

The chemical equation for the reaction between sodium hydride and water is

 $NaH+H_2O\longrightarrow NaOH+H_2$  

Water in the reaction is ...

• an oxidising agent

•  a reducing agent

• both an oxidising agent and a reducing agent

• neither an oxidisding agent nor a reducing agent