71-What is the chemical name of Sodium hydrogencarbonate?
(A) Baking Soda
(B) Lime soda
(C) Lemon
(D) Bleaching powder
72- Mild non corrosive basic salt is
(A) Rock salt
(B) Baking soda
(C) Lime soda
(D) All of the above
73- What are the uses of baking soda?
(A) For making Baking powder
(B) Used in soda acid fire extinguisher
(C) In household works like bread, pakora etc
(D) All of the above
74-Which of the following can be obtained from sodium chloride?
(A) Washing soda
(B) Baking soda
(C) Bleaching powder
(D)All of the above
75- Plaster of Paris is obtained by ………….
(A) Heating gypsum at very high temperature
(B)By adding water to calcium sulphate
(C) Cooling gypsum at 0oC
(D) Heating gypsum at 100oC
76-…………… is called as white powder?
(A) Plaster of Paris
(B) Talcum Powder
(C) Copper sulphate
(D) All of the above
77-Difference between molecules of Gypsum and Plaster of Paris is
(A) 2/2
(B) 3/2
(C) 1/2
(D) 2/3
78- Plaster of Paris hardens by
(A) Combining with hydroxide
(B) Combining with oxygen
(C) Combining with water
(D) None of the above
79- Select the correct statement about Plaster of Paris.
| 1. Plaster of Paris is used to make ornate designs on walls and ceilings.
2. On Heating gypsum at 373 K CaSO4 is obtained. 3. Plaster of Paris is used for curing bone fractures. 4. Dead burnt Plaster is CaSO4 anhydrous calcium sulphate. |
(A) Option 1, 2, 3 are correct
(B) Option 3 and 4 are correct
(C) All Options are incorrect
(D) All options are correct
80-Which of the following is also known as Alabaster?
(A) Gypsum
(B) Plaster of Paris
(C) Calcium carbonate
(D) All of the above
ANSWERS:
71-(A), 72-(B), 73-(D), 74-(D), 75-(D), 76-(A), 77-(B), 78-(C), 79-(D), 80-(A)