Related InterviewSolutions

• Calculate the enthalpy change when `50 mL` of `0.01 M Ca(OH)_(2)` reacts with `25mL` of `0.01 M HCI`. Given that `DeltaH^(Theta)` neutralisaiton of strong acid and string base is `140 kcal mol^(-1)`A. `14 cal`B. `35 cal`C. `10 cal`D. `7.5 cal`
• If an average person jogs, hse produces 14.5 × 103 cal/min. This is removed by the evaporation of sweat. The amount of sweat evaporated per minute (assuming 1 kg requires 580 × 103 cal for evaparation) is(a) 0.25 kg(b) 2.25 kg(c) 0.05 kg(d) 0.20 kg
• For the reaction at `25^(@)C, C_(2)O_(4)(l) rarr 2XO_(2)(g)` `Delta H =2.1 kcal` and `DeltaS=20 cal K^(-1)` . The reaction would be `:`A. spontaneousB. non`-` spontaneousC. at equilibriumD. unpredictable
• A reaction has `DeltaH=-33KJ` and `DeltaS=-58(J)/(K)` . This reaction would be:A. spontaneous at all temperatureB. non`-` spontaneous at all temperaturesC. spontaneous above a certain temperature onlyD. spontaneous below a certain temperature only
• During complete combustion of one mole of butane, 2658 kJ of heat is released. The thermochemical reaction for above change is
• Consider the reactions given below. On the basis of these reactions find out which of the algebric relations given in options (i) to (iv) is correct?(a) C(g) + 4H(g) → CH4 (g); ΔrH = x kJ mol–1(b) C (graphite,s) + 2H2 (g) → CH4 (g); ΔrH = y kJ mol–1(i) x = y(ii) x = 2y(iii) x > y(iv) x < y
• The entropy change can be calculated by using the expression ΔS = qrev/T . When water freezes in a glass beaker, choose the correct statement amongst the following : (i) ΔS (system) decreases but ΔS (surroundings) remains the same. (ii) ΔS (system) increases but ΔS (surroundings) decreases. (iii) ΔS (system) decreases but ΔS (surroundings) increases. (iv) ΔS (system) decreases and ΔS (surroundings) also decreases.
• The enthalpy of combustion of graphite is 393.4 kJ. Calculate(a) The amount of graphite needed to produce 196.7 KJ of heat.(b) The number of moles of CO2 formed when 196.7 KJ of heat is produced.(c) The volume of oxygen required at S.T.P. to from 24.0 g of graphite in this process.
• The net enthalpy change of a reaction is the amount of energy required to break all the bonds in reactant molecules minus amount of energy required to form all the bonds in the product molecules. What will be the enthalpy change for the following reaction. H2(g) + Br2(g) → 2HBr(g) Given that Bond energy of H2, Br2 and HBr is 435 kJ mol–1, 192 kJ mol–1 and 368 kJ mol–1 respectively.
• For a closed container containing `100` mol of an ideal gas fitted with movable, frictionless, weightless piston operating such that pressure of gas remain constant at `8.21` atm, which graph repsents correct variation of log `V v//s` log `T` where `V` is in litre and `T` is in Kelvin ? `(R = 0.0821 (atmL)/(molK))`A. B. C. D.