AP Chemistry - Sample MCQ Questions

1.	The amount of heat evolved when 500 cm3 of 0.1 M HCl is mixed with 200 cm3 of 0.2 M NaoH is (A) 2.292 kJ (B) 1.292 kJ (C) 22.9 kJ (D) 0.292 kJ	Answer: (A)
2.	The amount of the heat released when 20 ml 0.5 M NaOH is mixed with 100 ml 0.1 M HCI is ´ kJ. The heat of neutralization is (A) –100 x kJ/mol (B) –50 x kJ/mol (C) +100 x kJ/mol (D) +50 x kJ/mol	Answer: (A)
3.	The atomic numbers of Ni and Cu are 28 and 29 respectively. The electron configuration 1s2 2s2 2p6 3s2 3p6 3d10 represents (A) Cu+ (B) Cu2+ (C) Ni2+ (D) Ni	Answer: (A)
4.	The basicity of aniline is less than that of cyclohexylamine. This is due to (A) +R effect of -NH2 group (B) -I effect of -NH2 group (C) -R effect of -NH2 group (D) hyperconjugation effect	Answer: (A)
5.	The brown ring test for nitrates depends on (A) the reduction of nitrate to nitric oxide (B) oxidation of nitric oxide to nitrogen dioxide (C) reduction of ferrous sulphate to iron (D) oxidising action of sulphuric acid	Answer: (A)
6.	The catalyst used in the preparation of an alkyl chloride by the action of dry HCI on an alcohol is (A) anhydrous AlCl3 (B) FeCl3 (C) anhydrous ZnCl2 (D) Cu	Answer: (C)
7.	The compound which gives turbidity immediately with Lucas reagent at room temperature is ______. (A) butan-2-ol (B) butan-1-ol (C) 2-methyl propan-1-ol (D) 2-methyl propan-2-ol	Answer: (D)
8.	The concentration of a reactant X decreases from 0.1 M to 0.025 M in 40 minutes. If the reaction follows I order kinetics, the rate of the reaction when the concentration of X is 0.01 M will be (A) 1.73 ´ 10-4 M min-l (B) 2.47 ´ 10-4 M min-l (C) 3.47 ´ 10-5 M min-l   (D) 1.73 ´ 10-5 M min-l	Answer: (B)
9.	The conversion of m-nitrophenol to resorcinol involves respectively (A) diazotization, reduction and hydrolysis (B) hydrolysis, diazotization and reduction (C) reduction, diazotization and hydrolysis (D) hydrolysis, reduction and diazotization	Answer: (C)
10.	The correct decreasing order of dipole moment in CH3CI, CH3Br and CH3F is (A) CH3F > CH3CI > CH3Br (B) CH3F > CH3Br > CH3CI (C) CH3CI> CH3F > CH3Br (D) CH3CI> CH3Br > CH3F	Answer: (C)
11.	The decomposition of a certain mass of CaCO3 gave 11.2 dm3 of CO2 gas at STP. The mass of KOH required to completely neutralise the gas is (A) 56 g (B) 28 g (C) 42 g (D) 20 g	Answer: (A)
12.	The density of a gas is 1.964 g dm-1 at 273 k and 76 cm Hg. The gas is (A) CH4 (B) C2H6 (C) CO2 (D) Xe	Answer: (C)
13.	The electronic transitions from n = 2 to n = 1 will produce shortest wavelength in (where n = principal quantum state) (A) Li+2 (B) He+ (C) H (D) H+	Answer: (A)
14.	The empirical formula of a nonelectrolyte is CH2O. A solution containing 3g of the compound exerts the same osmotic pressure as that of 0.05 M glucose solution. The molecular formula of the compound is (A) C2H4O2 (B) CH2O (C) C3H6O3 (D) C4H8O4	Answer: (A)
15.	The energy of an electron in first Bohr orbit of H – atom is – 13.6 eV. The possible energy value of electron in the excited state of Li2+ is (A) –122.4 eV (B) 30.6 eV (C) –30.6 eV (D) 13.6 eV	Answer: (C)