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13.	The oxide ore is concentrated by
	A.  Froth floatation
	B.  Electromagnetic separation
	C.  Calcinations
	D.  Gravity separation

Answer

Ans: D Gravity separation

14.	Which of the following is more reactive than magnesium?
	A.  Copper
	B.  Calcium
	C.  Tin
	D.  Lead

Answer

Ans: B Calcium

15.	The atomic orbital is
	A.  The region in which there is maximum probability of finding electron
	B.  The circular path of the electron
	C.  Three dimensional field around nucleus
	D.  Elliptical shaped orbit

Answer

Ans: A The region in which there is maximum probability of finding electron

16.	The percentage of acetic acid in vinegar is
	A.  1-4%
	B.  2-3%
	C.  5-7%
	D.  6-10%

Answer

Ans: D 6-10%