Related InterviewSolutions

• The enthalpies of neutralisation of a strong acid HA and weaker acid HB by NaOH are -13.7 and -12.7 kcal/eq. When one equivalent of NaOH is added to a mixture containing 1 equivalent of HA and HB; the enthalpy change was -13.5kcal. In what ratio is the base distributed between HA and HB?
• Curves A and B describe the log P versus log V relation for helium, hydrogen, O3and PH3during adiabatic process. Curve C is for(A) He(B) H2(C) O3(D) PH3
• The enthalpies of neutralization of HClO4and Cl3C – COOH are –13.5 kcal/g equivalent and –14.7 kcal/g equivalent respectively. When 40 gm of solid NaOH is added to a mixture of 1 gm mol HClO4and 1 g mol Cl3C – COOH, solution perchlorate and sodium trichloroacetate are formed in molar ratio of 3 : 1. Then(A)ΔH for the reaction of NaOH with the mixture is 6.45 kcal(B)ΔH for the reaction of NaOH with the mixture is 13.8 kcal(C) After reaction the total number of moles of acid remained are 0.5 (HClO4and Cl3C – COOH)(D) After reaction the total weight of acid remained is 147.75 gm (HClO4and Cl3C – COOH) andΔH for the reaction of NaOH with mixture is –13.8 kcal.
• Time period of a block when suspended from the upper plate of a parallel plate capacitor by a spring of stiffness k,is T,when block is uncharged. If a charge qis given to the block, then the new time period of oscillation will be(a) T(b) > T(c) < T(d)≥ T
• A point performs SHM along a straight line with a period T = 0.60 s and amplitude a = 10 cm. Starting from extreme position, in what time, the point travels a distance a/2?(A) 10 s(B) 1.0 s(C) 0.1 s(D) 0.01 s
• Which is least reactive towards nucleophilic substitution (SN2)
• Statement-I : The graph of potential energy and kinetic energy of a particle in SHM with respect to position is a parabola.Statement-II : Potential energy and kinetic energy do not vary linearly with position.(a) If both Statement- I and Statement- II are true, and Statement - II is the correct explanation of Statement– I.(b) If both Statement - I and Statement - II are true but Statement - II is not the correct explanation of Statement – I.(c) If Statement - I is true but Statement - II is false.(d)If Statement - I is false but Statement - II is true.
• Acceleration-displacement graph of a particle executing SHM Is as shown in given figure. The time period of its oscillation is: (in sec)(A)π/2(B) 2π(C) π(D) π/4
• A cylinder of radius R made of a material of thermal conductivity K1 is surrounded by a cylindrical shell of inner radius R and outer radius 2R made of a material of thermal conductivity K2 . The two ends of the combined system are maintained at two different temperatures. There is no loss of heat across the cylindrical surface and the system is in steady state. The effective thermal conductivity is-(A) K1 + K2(B) K1 K2/K1+K2(C) K1+3K2/4(D) 3K1 +K2/4
• Two rods of same material and thickness are joined as shown below. The ends X and Y are maintained at XºC and YºC respectivelythe ratio of heat flow at M and N are Q1 and Q2 respectively. Then –(A) Q1 = Q2(B) Q1 > Q2(C) Q1 < Q2(D) Q1 = Q2/2