Question Bank Directory

The absolute enthalpy of neutralisation of the reaction $MgO(s) + 2HCl(aq) ightarrow MgCl_{2}(aq) + H_{2}O(l)$ will be [CBSE PMT 2005]:

The work done to contract a gas in a cylinder is 462 joules. 128 joule energy is evolved in the process. What will be the internal energy change in the process? [MP PMT 2003]

Based on the following thermochemical equations: (i) $H_{2}O(g) + C(s) ightarrow CO(g) + H_{2}(g); \Delta H = 131 ext{ kJ}$ (ii) $CO(g) + rac{1}{2}O_{2}(g) ightarrow CO_{2}(g); \Delta H = -282 ext{ kJ}$ (iii) $H_{2}(g) + rac{1}{2}O_{2}(g) ightarrow H_{2}O(g); \Delta H = -242 ext{ kJ}$ The value of $X$ for the reaction $C(s) + O_{2}(g) ightarrow CO_{2}(g); \Delta H = X ext{ kJ}$ is [CBSE PMT 1992]:

Which of the following equations correctly represents the standard heat of formation (ΔfH°) of methane [IIT JEE (Screening) 1992]?

Which is the important site of formation of glycoproteins and glycolipids in eukaryotic cells?

In which of the following forms is iron absorbed by plants?

The freezing point depression constant ($K_f$) of benzene is 5.12 K kg $mol^{-1}$. The freezing point depression for the solution of molality 0.078 m containing a non-electrolyte solute in benzene is (rounded off upto two decimal places) :

The plant parts which consist of two generations - one within the other: (a) Pollen grains inside the anther (b) Germinated pollen grain with two male gametes (c) Seed inside the fruit (d) Embryo sac inside the ovule

A system is changed from state A to state B by one path and from B to A by another path. If $E_{1}$ and $E_{2}$ are the corresponding changes in internal energy, then [Pb. PMT 2001]:

Which of the following is put into Anaerobic sludge digester for further sewage treatment?

If for a certain reaction $\Delta_r H$ is $30\text{ kJ mol}^{-1}$ at $450\text{ K}$, the value of $\Delta_r S$ (in $\text{J K}^{-1}\text{ mol}^{-1}$) for which the same reaction will be spontaneous at the same temperature is:

The work done during the expansion of a gas from a volume of $4\text{ dm}^3$ to $6\text{ dm}^3$ against a constant external pressure of $3\text{ atm}$ is:

Equal volumes of two monoatomic gases, A and B, at same temperature and pressure are mixed. The ratio of specific heats ($C_p/C_v$) of the mixture will be:

One mole of an ideal gas at $300\text{ K}$ is expanded isothermally from an initial volume of $1\text{ litre}$ to $10\text{ litres}$. The $\Delta E$ for this process is: ($R = 2\text{ cal mol}^{-1}\text{K}^{-1}$)

A metallic rod of mass per unit length $0.5 \text{ kg m}^{-1}$ is lying horizontally on a smooth inclined plane which makes an angle of $30^{\circ}$ with the horizontal. The rod is not allowed to slide down by flowing a current through it when a magnetic field of induction $0.25 \text{ T}$ is acting on it in the vertical direction. The current flowing in the rod to keep it stationary is

For the reaction $\text{C}_2\text{H}_5\text{OH}(l) + 3\text{O}_2(g) \rightarrow 2\text{CO}_2(g) + 3\text{H}_2\text{O}(l)$ which one is true?

The heat of combustion of carbon to $CO_2$ is -393.5 kJ/mol. The heat released upon the formation of 35.2 g of $CO_2$ from carbon and oxygen gas is:

For a given reaction, if $\Delta H = 35.5 \text{ kJ/mol}$ and $\Delta S = 83.6 \text{ J/K}\cdot\text{mol}$, at what temperature is the reaction spontaneous? (Assume $\Delta H$ and $\Delta S$ remain constant with temperature.)

For a sample of perfect gas when its pressure is changed isothermally from $p_i$ to $p_f$, the entropy change is given by:

A motor cyclist moving with a velocity of $72 \text{ km/hour}$ on a flat road takes a turn on the road at a point where the radius of curvature of the road is $20 \text{ meters}$. The acceleration due to gravity is $10 \text{ m/sec}^2$. In order to avoid skidding, he must not bend with respect to the vertical plane by an angle greater than: