Question

35. Study the reaction scheme below and then answer (a), (b) and (@) which
Marble
Calcium oxide + Gas A
(CaCO3) dapat
+ little water
230
Solid B
Strong heat
+ excess water and filter
+ excess water and filter
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Solution C
easum carbonate. Ceca
(a) Give the chemical name and formula of (i) marble, (ii) gas ‘A’, (iii) solid B :
(b) What would you expect to see (or observe) when drops of water are added to solid calcium Oxide.
(c) (i) Rewrite the following sentences filling in the blanks:
Solution C is normally called........
When gas ‘A’ is bubbled through 'C', a white precipitate of.............is formed. What
(ii) On bubbling excess of gas A through the resulting suspension, the white precipitate dissolves and
then reappears on boiling. Suggest an explanation for these observations.​

Answer 1

Answer:

chemical name of marble is calcium carbonate (CaCO3).....

gas A is certainly carbon dioxide (CO2)6

Explanation:

b. when drops of water are added on calcium oxide it will evolved heat as it is an exothermic process ...

c. slaked lime.

and calcium carbonate is formed..

Answer 2

Answer:

........... ........ a good question