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Enthalpy change for the reaction, $4H(g) \rightarrow 2H_2(g)$ is $-869.6 \text{ kJ}$. The dissociation energy of the H-H bond is:
What is the entropy change (in J K⁻¹ mol⁻¹) when one mole of ice is converted into water at 0 ºC? (The enthalpy change for the conversion of ice to liquid water is 6.0 kJ mol⁻¹ at 0 ºC)
Cuboidal epithelium with brush border of microvilli is found in
Consider the following reactions: (i) $H^+(aq) + OH^-(aq) \rightarrow H_2O(l); \Delta H = -x_1 \text{ kJ mol}^{-1}$ (ii) $H_2(g) + \frac{1}{2}O_2(g) \rightarrow H_2O(l); \Delta H = -x_2 \text{ kJ mol}^{-1}$ (iii) $CO_2(g) + H_2(g) \rightarrow CO(g) + H_2O(l); \Delta H = -x_3 \text{ kJ mol}^{-1}$ (iv) $C_2H_5(g) + \frac{5}{2}O_2(g) \rightarrow 2CO_2(g) + H_2O(l); \Delta H = -x_4 \text{ kJ mol}^{-1}$ Enthalpy of formation of $H_2O(l)$ is:
The formation of a solution from two components can be considered as: (i) Pure solvent → separated solvent molecules, ∆H₁ (ii) Pure solute → separated solute molecules, ∆H₂ (iii) Separated solvent and solute molecules → solution, ∆H₃ The solution so formed will be ideal if:
The heat of transition ($\Delta H_t$) of graphite into diamond would be, given the following thermochemical equations: 1. C(graphite) + O$_2$(g) $\rightarrow$ CO$_2$(g); $\Delta H = x$ kJ 2. C(diamond) + O$_2$(g) $\rightarrow$ CO$_2$(g); $\Delta H = y$ kJ
Work done during reversible isothermal expansion of one mole of hydrogen gas at 25°C from a pressure of 20 atmospheres to a pressure of 10 atmospheres is: (Given: R = 2.0 cal K–1 mol–1)
Match List I with List II. List-I (Process) A. Isothermal process B. Isochoric process C. Isobaric process D. Adiabatic process List-II (Conditions) I. No heat exchange II. Carried out at constant temperature III. Carried out at constant volume IV. Carried out at constant pressure Choose the correct answer from the options given below:
For irreversible expansion of an ideal gas under isothermal conditions, the correct option is:
Which p-V curve among the following depicts the highest amount of work done?
Match the processes or properties in List-I with their corresponding characteristics in List-II. List-I (Process/Property) A. Adiabatic process B. Reversible process C. Intensive property D. Extensive property List-II (Characteristic) I. Independent of the amount of substance II. The reaction can proceed in both directions, from reactants to products and vice versa III. No transfer of heat between the system and the surrounding IV. Dependent on the amount of substance Choose the correct answer from the options given below:
Determine $\Delta U$ for the process where, one mole of an ideal gas at $300 \text{ K}$ is expanded isothermally from $1 \text{ L}$ to $10 \text{ L}$ volume: (Use $R = 8.314 \text{ J K}^{-1} \text{ mol}^{-1}$)
What type of ecological pyramid would be obtained with the following data? Secondary consumer : 120 g, Primary consumer : 60 g, Primary producer : 10 g
The transverse section of a plant shows following anatomical features : (a) Large number of scattered vascular bundles surrounded by bundle sheath (b) Large conspicuous parenchymatous ground tissue (c) Vascular bundles conjoint and closed (d) Phloem parenchyma absent. Identify the category of plant and its part :
Which of the following statements are true for the phylum-Chordata? (a) In Urochordata notochord extends from head to tail and it is present throughout their life. (b) In Vertebrata notochord is present during the embryonic period only. (c) Central nervous system is dorsal and hollow. (d) Chordata is divided into 3 subphyla : Hemichordata, Tunicata and Cephalochordata.
Montreal protocol was signed in 1987 for control of
According to Robert May, the global species diversity is about
Match the following: (a) Inhibitor of catalytic activity (i) Ricin (b) Possess peptide bonds (ii) Malonate (c) Cell wall material in fungi (iii) Chitin (d) Secondary metabolite (iv) Collagen. Choose the correct option from the following: (1) (a)-(ii), (b)-(iv), (c)-(iii), (d)-(i) (2) (a)-(iii), (b)-(iv), (c)-(i), (d)-(ii) (3) (a)-(iii), (b)-(iv), (c)-(i), (d)-(ii) (4) (a)-(ii), (b)-(iii), (c)-(i), (d)-(iv)
Match List-I (Equations/Conditions) with List-II (Type of processes) and select the correct option. **List-I (Equations)** (a) $K_p > Q$ (b) $T < \frac{\Delta H}{\Delta S}$ (for $\Delta H > 0$) (c) $K_p = Q$ (d) $T > \frac{\Delta H}{\Delta S}$ (for $\Delta H > 0$) **List-II (Type of processes)** (i) Non-spontaneous (ii) Equilibrium (iii) Spontaneous and endothermic (iv) Spontaneous
Two parallel metal plates having charges +Q and -Q faces each other at a certain distance between them. If the plates are now dipped in kerosene oil tank, the electric field between the plates will