Marble’s popularity began in ancient Rome and Greece, where white and off-white marble were used to construct a variety of structures, from hand-held sculptures to massive pillars and buildings.
1. The substance not likely to contain CaCO3 is
a) Dolomite
b) A marble statue
c) Calcined gypsum
d) Sea shells.
2. A student added 10g of calcium carbonate in a rigid container, secured it tightly and started to heat it. After some time, an increase in pressure was observed, the pressure reading was then noted at intervals of 5 mins and plotted against time, in a graph as shown below. During which time interval did maximum decomposition took place?
a) 15-20 min
b) 10-15 min
c) 5-10 min
d) 0-5 min
3. Gas A, obtained above is a reactant for a very important biochemical process which occurs in the presence of sunlight. Identify the name of the process -
a) Respiration
b) Photosynthesis
c) Transpiration
d) sphotolysis
4. Marble statues are corroded or stained rain water. Identify the main reason.
a) decomposition of calcium carbonate to calcium oxide
b) polluted water is basic in nature hence it reacts with calcium carbonate
c) polluted water is acidic in nature hence it reacts with calcium carbonate
d) calcium carbonate dissolves in water to give calcium hydroxide.
5. Calcium oxide can be reduced to calcium, by heating with sodium metal. Which compound would act as an oxidizing agent in the above process?
a) Sodium
b) sodium oxide
c) calcium
d) calcium oxide
