2nd Year Chemistry S-Block Elements
MCQs Chapter No. 2 Solved Exercise
11. Dead burnt gypsum is:
(a) CaSO4 . 2H2O
(b) CaSO4 . 1/2 H2O
(c) CaSO4
(d) MgSo4.7H2O
Answer:
(c) CaSO4
12. When some water is added to plaster of Paris, it becomes hard and expansion in volume how much:
(a) 1%
(B) 10%
(c) 4%
(d) 2%
Answer:
(a) 1%
13. Which of the following compound in formed when Na burn in excess of air:
(a) NaO2
(b) Na2O2
(c) Na2O
(d) Na2O3
Answer:
(b) Na2O2
14. Chemical formula of slaked lime is:
(a) CaCO3
(b) Ca (OH)2.H2O
(c) Ca (OH2)
(d) CaSO4
Answer:
(c) Ca (OH2)
15. Which of the following is not a function of sulphur:
(a) Enlarged root system in plants
(b) Chlorophyll development in leaves
(c) Good yield of crops
(d) Control of pH of soil
Answer:
(d) Control of pH of soil
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