Q. Five different books (P, Q, R, S, T) are to be arranged on a shelf. The books R and S are to be arranged first and second, respectively from the right side of the shelf. The number of different orders in which P, Q and T may be arranged is . (A) 2 (B) 6 (C) 12 (D) 120 Ans: 6 ...

Q. It would take one machine 4 hours to complete a production order and another machine 2 hours to complete the same order. If both machines work simultaneously at their respective constant rates, the time taken to complete the same order is_______________hours. (A) 2/3 (B) 3/4 (C) 4/3 ...

Q. The boat arrived_______________dawn. (A) in (B) at (C) on (D) under Ans: at Solution: The correct sentence is: "The boat arrived at dawn." In this context, "at" is the appropriate preposition to indicate the specific time when the boat arrived.

Q. The strategies that the company_______to sell its products________house-to-house marketing. (A) use, includes (B) uses, include (C) used, includes (D) uses, including Ans: uses, include Solution: "The strategies that the company uses to sell its products include ...

Q. The normal boiling point of a compound (X) is 350 K (heat of vaporization, ∆vapH, = 30 kJ mol–1). The pressure required to boil ‘X’ at 300 K is ____Torr. (Round off to two decimal places) (Ignore the temperature variation of ∆vapH; Gas constant R = 8.31 J mol–1 K–1 and 1 atm = 760 Torr) ...

Q. Consider the following two parallel irreversible first order reactions at temperature T, where 𝑘1and 𝑘2 are the rate constants and their values are 5 × 10–2 and 15 × 10–2 min–1, respectively, at temperature T. If the initial concentration of the reactant ‘P’ is 4 mol L–1, then the ...

Q. The specific rotation of optically pure (R)-2-bromobutane is –112.00. A given sample of  2-bromobutane exhibited a specific rotation of –82.88. The percentage of (S)-(+)-enantiomer present in this sample is Ans: The specific rotation of optically pure (R)-2-bromobutane is –112.00. A given ...

Q. The number of possible optically active isomer(s) for the following complex is en = ethylenediamine Ans: 2 Solution: Optical Isomers are a set of two compounds with different spatial arrangements and the same no of atoms and molecules.

Q. A complex is composed of one chromium ion, three bromides and six water molecules. Upon addition of excess AgNO3, 1.0 g aqueous solution of the complex gave 0.94 g of AgBr. The molecular formula of the complex is (Atomic weight:  Cr = 52, Br = 80, Ag = 108, O = 16 and H = 1) (A) Br3 ...

Q. The rate of the following redox reaction is slowest when X is 3+/2+ + 2+ → 2+ + 3+/2+ (A) H2O (B) NH3 (C) Cl– (D) N3– Ans: NH3

Q. In the following reaction sequence, the products P and Q are Ans: Option C

Q. Suppose the wave function of a one dimensional system is y = sin(kx) exp(3ikx) . In an experiment measuring the momentum of the system, one of the expected outcomes is (A) 0 (B) ћk (C) 2 ћk (D) 3 ћk Ans: 2 ћk