Chemistry Basics Multiple Choice questions

1.	A compound is formed by elements A and B. This crystallises in the cubic structure where the A atoms are at the comers of the cube and B atoms are at the body centres. The simplest formula of the compound is (A) AB (B) A6B (C) A8B4 (D) AB6	Answer: (A)
2.	A compound of 'A' and 'B' crystallises in a cubic lattice in which the 'A' atoms occupy the lattice points at the comers of the cube. The 'B' atoms occupy the centre of each face of the cube. The probable empirical formula of the compound is (A) AB (B) AB3 (C) AB2 (D) A3B	Answer: (B)
3.	A covalent molecule AB3 has pyramidal structure. The number of lone pair and bond pair electrons in the molecule are respectively (A) 3 and 1 (B) 1 and 3 (C) 2 and 2 (D) 0 and 4	Answer: (B)
4.	A diabetic person carries a pocket of Glucose with him always, because (A) Glucose reduces the blood sugar level. (B) Glucose increases the blood sugar level almost instantaneously. (C) Glucose reduces the blood sugar level slowly. (D) Glucose increases the blood sugar level slowly.	Answer: (B)
5.	A dibromo derivative of an alkane reacts with sodium metal to form an alicyclic hydrocarbon. The derivative is ______. (A) 2, 2 - dibromobutane (B) 1, 1 - dibromopropane (C) 1, 4 - dibromobutane (D) 1, 2 - dibromoethane	Answer: (C)
6.	A gas deviates from ideal behaviour at a high pressure because its molecules (A) attract one another (B) show the Tyndall effect (C) have kinetic energy (D) are bound by covalent bonds	Answer: (A)
7.	A gaseous mixture was prepared by taking equal mole of CO and N2. If the total pressure of the mixture was found 1 atmosphere, the partial pressure of the nitrogen (N2) in the mixture is (A) 1 atm (B) 0.5 atm (C) 0.8 atm (D) 0.9 atm	Answer: (B)
8.	A ligand can also be regarded as (A) Lewis acid (B) Bronsted base (C) Lewis base (D) Bronsted acid	Answer: (C)
9.	A metal present in insulin is (A) copper (B) iron (C) zinc (D) aluminium	Answer: (C)
10.	A mixture of CaCl2 and NaCl weighing 4.44 g is treated with sodium carbonate solution to precipitate all the Ca+2 ions as calcium carbonate. The calcium carbonate so obtained is heated strongly to get 0.56 g of CaO. The percentage of NaCl in the mixture (atomic mass of Ca = 40) is ______. (A) 30.6 (B) 75 (C) 69.4 (D) 25	Answer: (B)
11.	Which of the following compound would not evolve CO2 when treated with NaHCO3 solution? (A) salicylic acid (B) phenol (C) benzoic acid (D) 4-nitro benzoic acid	Answer: (B)
12.	Which is not the correct statement about RNA and DNA? (A) DNA is active in virus where RNA never appears in virus (B) DNA exists as dimer while RNA is usually single stranded (C) DNA contains deoxyribose as its sugar and RNA contains ribose (D) RNA contains uracil in place of thymine (found in DNA) as a base	Answer: (A)
13.	Which cycloalkane has the lowest heat of combustion per CH2 group? (A) cyclopropane (B) cyclobutanc (C) cyclopontane (D) cyclohexane	Answer: (D)
14.	When a mixture of calcium benzoate and calcium acetate is dry distilled, the resulting compound is (A) acetophenone (B) benzaldehyde (C) benzophenone (D) acetaldehyde	Answer: (A)
15.	What is the nature of glucose-glucose linkage in starch that makes its so susceptible to acid hydrolysis? (A) Starch is hemiacetal (B) Starch is acetal (C) Starch is polymer (D) Starch contains only few molecules of glucose	Answer: (B)