01. For each of the following items, choose the most correct answer from the given alternatives and write its letter beside the item number in your answer sheet.
i)
The lightest and most abundant element in the
universe is:
A. Hydrogen
B. Sodium
C. Nitrogen
D. Oxygen
ii)
The highly flammable gas that burn with a blue flame
and react slowly with oxygen to form water is:
A. Nitrogen
B. Hydrogen
C. Ammonia
D. Chlorine
iii) Hydrogen gas is
used to fill weather balloons because:
A. It readily
combines with elements
B. It is highly
flammable
C. It is lighter than
air
D. It is a reducing
agent
iv)
The reaction of steam with methane to form carbon
dioxide and hydrogen gas is referred to as:
A. Oxy-hydrogen
flame production
B. Margarine
C. Steam Methane
Reforming
D. Hydrolysis of
water
v)
The chemical which is used to dry the hydrogen gas
by absorbing any moisture it contains is:
A. Calcium II
chloride
B. Hydrogen peroxide
C. Manganese IV
oxide
D. Dilute HCl
Answers:
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i
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ii
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iii
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iv
|
v
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|
|
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02. Draw a well
labeled diagram showing laboratory preparation of hydrogen using zinc granules
and diluted Hydrochloric acid.
03. Why hydrogen is
used:
(i)
To fill a weather balloon?
(ii)
To produce oxy-hydrogen flame?
04. Obagaja did an
experiment in the laboratory. He collected a gas in a gas jar. When lighten
wooden splint brought near the mouth of the gas jar containing the gas, a “pop
– sound” was heard.
i)
What is the name of the observed gas?
ii)
Mention three physical properties of the gas
iii) Mention any three
chemical properties of the gas
iv)
What happen when the gas reacts with oxygen gas?
(Give a balanced chemical equation for the reaction).
v)
What happen to the mixture of the gas and oxygen
when lit?
02. HYDROGEN
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