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9.	Which one of the following mixtures is homogeneous?
	A.  Methanol and water
	B.  Calcium carbonate and calcium bicarbonate
	C.  Graphite and charcoal
	D.  Starch and sugar

Answer

Ans: A Methanol and water

10.	The gas which had leaked out of Union Carbide factory in Bhopal was:
	A.  Methyl cyanide
	B.  Carbon monoxide
	C.  Methyl cyanide
	D.  Methyl isocynate

Answer

Ans: D Methyl isocynate

11.	'IC chips' for computers are usually made of
	A.  Chromium
	B.  Gold
	C.  Lead
	D.   Silicon

Answer

Ans: D Silicon

12.	'No two electrons in an atom can have the same set of four quantum number' is
	A.  Bohr's law
	B.  Newton's law
	C.  Pauli's exclusion principle
	D.  Aufbau principle

Answer

Ans: C Pauli's exclusion principle