Chemistry Quiz3

Which substances are used as antioxidant to prevent oil and fatty food items from being stale ?

• Carbon dioxide

• Reduction

• Nitrogen gas

• Oxidation

• Rancidity

By which reaction insoluble salts are produced ?

• Precipitation

• Combination

• Corrosion

• Redox

Which is the balance equation of Al + HCl→ AlCl3 + H₂?

• Al + HCl→ AlCl3 + 2H2

• 2Al + 3HC12AlCl3 + 2H2

• 2Al + 6HCI 2AlCl3 + 3H2

• 2Al + 4HC13AlCl3 + 3H2

What is the formula of lead sulphate ?

• P*b_{2}*S*O_{4}

• Pb (S*O_{4}) 2

• PbSO4

• Pb 2 (S*O_{4}) 3

Which is a reducing agent in reaction 3O_{2}(g) + 2H_{2}*S(g) -> 2H_{2}*O(l) + 2S*O_{2}(g)

• O_{2}

• H_{2}*O

• H_{2}*S

• S*O_{2}

Chemically, rusting is.............

• Hydrated ferrous oxide

• Ferric oxide

• Hydrated ferric oxide

Produced due to burning / Combustion of Methane.

• C*O_{2}

• H_{2}*O

• C*O_{2} and H_{2}*O both

• None of these

• Neither C*O_{2} nor H_{2}*O

Oil and fat containing food items kept for long time, due to which process it becomes stale ?

Silver articles are kept in open for long time, due to formation of which substance it becomes black ?

• H_{2}*S

• Corrosion

• Reduction

• Hydrogenation

• A*g_{2}*S

When dilute hydrochloric acid reacts with zinc metal, which of the following is needed for the identification of excreted gas?

• Red litmus paper

• AgS

• Lime water

• Burning ribbon

• AgSO4