01. Answers:
|
i |
ii |
iii |
iv |
v |
|
A |
B |
A |
A |
B |
02.
Preparation
of oxygen
03.
BASIC,
ACIDIC
04.
Physical properties of oxygen gas
·
It
is colourless, odourless and tasteless gas
·
It
is slightly soluble in water
·
It
is about 1.1 denser than air
·
It
boils at -1830C
·
It
freezes at -2180C
05.
Uses of oxygen
·
Used in respiration
process
·
In medical or hospital is
used:
o
As aid in breathing
o
In incubator for
premature babies
·
In transport is used:
o
As oxidizer for rocket
fuel
o
For respiration in
spacecraft and submarines
·
In chemical process is
used:
o
To manufacture chemicals
eg. Acids and oxides
o
In combustion
o
In oxidation to remove
impurities
06.
i.
Metal X is Magnesium (Mg)
ii. The product is magnesium oxide (MgO)
07.
ii. Potassium Chlorate decompose on heating to form potassium chloride and oxygen gas. (see the chemical equation here)
08.
The
function of manganese (IV) oxide in 7 (i) is to speed up the rate of
decomposition of hydrogen peroxide forming water and oxygen gas.
Note:
This catalyst (MnO2) can be used in 7 (ii) also to speed the rate of
decomposition of potassium chlorate.
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