Carbon and Its Compounds - ICSE STD 8 CHEMISTRY Questions

State in brief the transformation of vegetable matter to different types of coal varying in carbon content. State two uses each of $(a)$ coal $(b)$ coke $(c)$ lampblack or soot.

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Q 12[3 Mark Question Answer]3 Marks

State the reasons for $(a)$ Use of diamond $–$ as an item of jewellery, $(b)$ Use of graphite $–$
$(i)$ as a lubricant for heated machine parts
$(ii)$ as a lining for crucibles used in manufacture of high grade steel
$(iii)$ as an electrode in electroplating.

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Q 13[3 Mark Question Answer]3 Marks

Compare the structure of the crystal of diamond $\&$ graphite with special reference to the reason for diamond being the hardest natural substance while graphite one of the softest. Compare the electrical & thermal conductivity of the two crystalline allotropes of carbon.

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Q 14[5 Mark Question Answer]4 Marks

Starting from carbon dioxide how would you obtain $(a)$ A weak acid $(b)$ A fertilizer $(c)$ A highly poisonous gas $(d)$ Black particles of carbon. $[$Give balanced equations for the same$]$

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Q 15[5 Mark Question Answer]4 Marks

In the laboratory preparation of carbon dioxide by action of a dilute acid on a metallic carbonate give $- (a)$ A balanced equation for the preparation $(b)$ A reason for $(i)$ use of a washer bottle containing cone. $\ce{H_2SO_4}$ in the preparation $(ii)$ Not collecting the prepared gas over water $(iii)$ Not using dilute sulphuric acid as a reactant in the preparation.

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Q 16Fill in the blanks.1 Mark

Sodium oxide combines with carbon dioxide to give $………. [$sodium carbonate$/$sodium bicarbonate$]$.

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Q 17Fill in the blanks.1 Mark

$…….. [$organic$/$inorganic$]$ Chemistry is the Chemistry of carbon compounds mainly of ‘Carbon’, ‘Hydrogen’ $\&$ ‘Oxygen’.

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Q 18Fill in the blanks.1 Mark

Adsorption capacity of wood charcoal is increased by passing $…….. [$carbon dioxide$/$steam$]$ over wood charcoal, at high temperature.

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Q 19Fill in the blanks.1 Mark

A graphite$-$clay mixture baked at high temperature is used in making $……. [$lubricants$/$refractory cruscibles$]$.