oxidising agent

reducing agent

both of these

none of these

the zinc surface became dull and black

a gas evolved which burnt with a pop sound

the solution remained colourless

the solution becomes green in colour

a displacement reaction

a decomposition reaction

an isomerization reaction

a double displacement reactions

black copper oxide

yellow copper oxide

red copper oxide

None of these

oxidation

reduction

rancidity

None of these

Make the ribbon surface shinier

Remove the layer of magnesium oxide from the ribbon surface

Remove the layer of magnesium carbonate from the ribbon surface

Remove the moisture from the ribbon surface

Hydrochloric acid

Barium sulphate

Chlorine

Sulphur

Exothermic process

Endothermic process

Reversible process

Physical process

Formation of new substances having entirely different properties than that of the reactants

Breaking of old chemical bonds and formation of new chemical bonds

Rearrangement of the atoms of reactants to form new products

Changing of the atoms of on element into those of another element to form new products

(i) and (ii)

(i) and (iii)

(i), (iii) and (iv)

(iii) and (iv)