Mid-three /lesson one-1
In the thermal decomposition reactions, the compound decomposes by heat into its
simple components
other compounds
primary elements
all the previous answers
When we heat mercuric oxide, we get............
mercuric oxide and water
mercuric oxide and oxygen
mercury and hydrogen
mercury and oxygen
When copper hydroxide is heated, we obtain
a. .
b. .
c. .
d. .
copper carbonate and water
copper oxide and water
copper oxide and hydrogen
copper and hydrogen
When calcium carbonate is hented, .......... are obtained.
calcium bicarbonate and carbon dioxide
. calcium hydroxide and carbon dioxide
calcium oxide and carbon monoxide
calcium oxide and carbon dioxide
On heating copper carbonate, the colour changes from
blue to black
green to black
black to green
green to blue
Most metal sulphates decompose when they are heated to metal oxide and.................. gas
a. b.
CO₂
0₂
SO₂
SO₃
On heating copper sulphate, a..........colour is formed.
black
green
blue
red
Copper sulphate is decomposed by heat into
black copper oxide only
sulphur trioxide gas only
sulphur dioxide gas and black copper oxide
black copper oxide and sulphur trioxide gas
black copper oxide only
sulphur trioxide gas only
sulphur dioxide gas and black copper oxide
black copper oxide and sulphur trioxide gas
Carbon dioxide evolves during thermal decomposition of.........compound
HgO
CuSO4
CuCO3
Cu(OH)2
On heating sodium nitrate, a...........colour is formed. .
white
black
yellowish white
blue
Chemical reaction is a process of breaking up of bonds between molecules of reactants and formation of new bonds between molecules of products.
right
wrong
Copper sulphate is decomposed by heat into black copper oxide and sulphur dioxide gas.
right
wrong
. Some metal nitrates decompose by heat into metal nitrate and hydrogen gas evolves.
right
wrong
4. Aluminium reacts with diluted hydrochloric acid faster than the reaction of zinc with the same acid.
right
wrong
. Copper replaces gold in its salt solutions, while the opposite doesn't occur.
right
wrong
. Both magnesium and zine can replace copper in copper sulphate solution
right
wrong
right
wrong
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