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CHEMISTRY [5 Mark Question Answer]

Carbon and Its Compounds · ICSE STD 8 (ICSE - English Medium). 4 questions.

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[5 Mark Question Answer]

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Question 15 Marks
Match the colunm
column $A$ column $B$
$1.$ A product of incomplete burning $a.$ Hopcolite
$2.$ Nature of carben monoxide $b.$ Combustible gas
$3.$ A compound formed by the combination of haemoglobin and carbon monoxide $c.$ carboxy$-$haemoglobin
$4.$ A mixture of metallic oxides $d.$ Carbon monoxide
$5.$ Carbon monoxide $e.$ Highly poisonous
Answer
column $ A$ column $B$
$1.$ A product of incomplete burning $d.$ Carbon monoxide
$2.$ Nature of carben monoxide $e.$ Highly poisonous
$3.$ A compound formed by the combination of haemoglobin and carbon monoxide $c.$ Carboxy $-$ haemoglobine
$4.$ A mixture of metallic oxides $a.$ Hopcolite
$5.$ Carbon monoxide $b.$ Combustible gas
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Question 25 Marks
Write three differences between graphite and diamond.
Answer
Difference between diamond and graphite. $br>$ Diamond
  1. Pure diamond is colourless and transparent.
  2. It is the hardest naturally occurring substance.
  3. It has high density i.e. $3.5\ g/cm^3$
  4. It is bad conduct of electricity.
  5. It bums in air at $900^\circ C$ to form carbon dioxide.
Graphite
  1. Graphite is greyish black opaque and shiny.
  2. It is soft and greasy to touch.
  3. It has low density i.e. $2.39\ g / cm^3$
  4. It is good conductor of electricity.
  5. It bums in air at $700^\circ C$ to form carbon dioxide.
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Question 35 Marks
Name four types of coal with percentage of carbon present in each,with uses.
Answer
Types of Coal:
  1. Peat: It is light brown in colour and contains only $50 – 60\%$ carbon. It is the most inferior form of coal.
  2. Lignite: it contains more than $60\%$ carbon. It is brown in colour and harder than peat.
  3. Bituminous: It has $90\%, 80\%, 70 – 75\%$ carbon contents. Bituminous coal is the most common variety of coal and used as house hold coal.
  4. Anthracite: It is the purest variety of coal. Its carbon contents vary between $92 – 98\%$. It is hard, dense and black, difficultto ignite.
Uses of coal:
  1. Coal is used as both domestic and industrial fuel.
  2. It is used to prepare coke, coal gas and coal tar.
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Question 45 Marks
How is wood charcoal made locally? What other substances are formed in the process.
Answer
$(c)$ Wood charcoal is prepared when wood is heated in a limited supply of air. Locally wood charcoal is prepared by piling logs of wood one above the other with a gap in the centre of the pile. The pile is covered with wet clay to prevent the entry of air. A few holes are left at the bottom of the pile. The wood is set on fire. After some time when fire dies out, wood charcoal is left behind. The other substances are  wood tar, pyroligneous acid and wood gas.
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[5 Mark Question Answer] - CHEMISTRY STD 8 Questions - Vidyadip