Objective type questions in Chemistry

1.	Generally, the first ionization energy increases along a period. But there are some exceptions. One which is NOT an exception is ______. (A) Na and Mg (B) N and O (C) Be and B (D) Mg and Al	Answer: (A)
8.	Which one of these is NOT true for benzene? (A) There are three carbon-carbon single bonds and three carbon-carbon double bonds. (B) It forms only one type of monosubstituted product. (C) The bond angle between the carbon-carbon bonds is 1200. (D) The heat of hydrogenation of benzene is less than the theoretical value.	Answer: (A)
3.	Gram molecular volume of oxygen at STP is (A) 11200 cm3 (B) 22400 cm3 (C) 5600 cm3 (D) 3200 cm3	Answer: (B)
4.	Graphite is a soft solid lubricant extremely difficult to melt. The reason for this anomalous behaviour is that graphite (A) has molecules of variable molecular masses like polymers. (B) has carbon atoms arranged in large plates of rings of strongly bound carbon atoms with weak interplate bonds. (C) is a non-crystalline substance. (D) is an allotropic form of carbon.	Answer: (B)
5.	Helium is used in balloons in place of hydrogen because it is (A) incombustible (B) lighter than hydrogen (C) radioactive (D) more abundant than hydrogen	Answer: (A)
6.	Hofmann's bromamide reaction is to convert (A) amine to amide (B) amide to amine (C) alcohol to acid (D) acid to alcohol	Answer: (B)
7.	How many chiral carbon atoms are present in 2, 3, 4 - trichloropentane? (A) 3 (B) 2 (C) 1 (D) 4	Answer: (B)
8.	How many optically active stereomers are possible for butan-2, 3-diol? (A) 1 (B) 2 (C) 3 (D) 4	Answer: (B)
9.	Hydrogen gas is not liberated when the following metal is added to dil. HCl (A) Ag (B) Zn (C) Mg (D) Sn	Answer: (A)
10.	Hydroxyl ion concentration of 1M HCl is (A) 1 ´ 1014mol dm-3 (B) 1 ´ 10-1mol dm-3 (C) 1 ´ 10-13mol dm-3 (D) 1 ´ 101mol dm-3	Answer: (A)