Chemical Reactions Quiz

Double substitution reactions between two salt solutions are accompanied by formation of ..........................

• a metal

• a precipitate

• an oxide

• a nonmetal

The oxygen evolves by heating .................................. compound.

• NaNO3

• CuSO4

• CuCO3

• Cu(OH)2

All of the following represents reduction process except ...................................

• decreasing oxygen

• gives up electrons

• gains electrons

• combination with hydrogen

In the reaction:

we can say that sodium (Na 11) is a reducing factor because it ...............................

• unites with oxygen

• loses one electron

• gains one electron

• gains hydrogen

Sodium metal can replace all of the following metals from their salt solutions except ..............................

• copper

• potassium

• magnesium

• zinc

On adding silver nitrate solution to sodium chloride solution, .......................... is formed.

• a white precipitate of sodium nitrate

• a white precipitate of silver chloride

• a blue precipitate of silver chloride

• no precipitate

The metal which can't replace the hydrogen of the acid is ............

• zinc

• aluminum

• copper

• sodium

In the reaction:

The reducing agent is .......................

• H2

• CuO

• Cu

• H2O

On heating sodium nitrate, a ................ colour is formed

• white

• black

• yellowish white

• blue

When hydrochloric acid reacts with sodium carbonate, the the reaction produces gas which ...........

• turbids limewater

• burns with pop sound

• increases ignition