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The product(s) of reaction catalyzed by nitrogenase in root nodules of leguminous plants is/are
Ozone is prepared by passing silent electric discharge through oxygen. In this reaction [AFMC 1998]:
Which of the following statements about inclusion bodies is incorrect?
The heat of combustion of carbon to $\text{CO}_2$ is $-393.5 \text{ kJ/mol}$. The heat released upon the formation of $35.2 \text{ g}$ of $\text{CO}_2$ from carbon and oxygen gas is:
Which of the following is true for an adiabatic process?
In which of the following reactions, the standard reaction entropy change ($\Delta S^{\circ}$) is positive, and standard Gibb's energy change ($\Delta G^{\circ}$) decreases sharply with increasing temperature?
Given the following reaction: $4\text{H(g)} \rightarrow 2\text{H}_2\text{(g)}$. The enthalpy change for the reaction is $-869.6 \text{ kJ}$. The dissociation energy of the H-H bond is:
The values of $\Delta H$ and $\Delta S$ for the given reaction are $170 \text{ kJ}$ and $170 \text{ J K}^{-1}$, respectively. $\text{C(graphite)} + \text{CO}_2\text{(g)} \rightarrow 2\text{CO(g)}$ This reaction will be spontaneous at:
For the gas phase reaction, $\text{PCl}_5\text{(g)} \rightleftharpoons \text{PCl}_3\text{(g)} + \text{Cl}_2\text{(g)}$, which of the following conditions is correct?
Match the following diseases with the causative organism and select the correct option. Column-I: (a) Typhoid, (b) Pneumonia, (c) Filariasis, (d) Malaria. Column-II: (i) Wuchereria, (ii) Plasmodium, (iii) Salmonella, (iv) Haemophilus.
The standard free energies of formation (in $\text{kJ/mol}$) at $298 \text{ K}$ are $-237.2$, $-394.4$, and $-8.2$ for $\text{H}_2\text{O(l)}$, $\text{CO}_2\text{(g)}$, and pentane (g), respectively. The value of $E^\circ_{\text{cell}}$ for the pentane-oxygen fuel cell is:
The process of growth is maximum during
Which of the following are not state functions? (I) $q + W$ (II) $q$ (III) $W$ (IV) $H - TS$
What is the amount of work done by an ideal gas, if the gas expands isothermally from $10^{-3} \text{ m}^3$ to $10^{-2} \text{ m}^3$ at $300 \text{ K}$ against a constant pressure of $10^5 \text{ N m}^{-2}$?
Under isothermal condition, a gas at $300 \text{ K}$ expands from $0.1 \text{ L}$ to $0.25 \text{ L}$ against a constant external pressure of $2 \text{ bar}$. The work done by the gas is:
Assuming each reaction is carried out in an open container, the reaction that shows $\Delta H = \Delta E$ is:
From Kirchhoff's equation which factor affects the heat of reaction [MP PMT 1990]
The enthalpy of neutralization of which of the following acids and bases is nearly –13.6 Kcal [Roorkee 1999]
An engine operating between 150°C and 25°C takes 500 J heat from a higher temperature reservoir. If there are no frictional losses, then the work done by the engine is [MH CET 1999]:
Two bodies of mass $3 \text{ kg}$ and $4 \text{ kg}$ are suspended at the ends of a massless string passing over a frictionless pulley. The acceleration of the system is ($g = 9.8 \text{ m/s}^2$)