List of top Questions asked in JCECE- 2008

Which one of the following aqueous solutions will exhibit highest boiling point?

The enthalpies of combustion of carbon and carbon monoxide are $-393.5$ and $-283\,\text{kJ}\,\text{mo}{{\text{l}}^{-1}}$ respectively. The enthalpy of formation of carbon monoxide per mol is

What is the equilibrium expression for the reaction, ${{P}_{4}}(s)+5{{O}_{2}}(g) \rightleftharpoons {{P}_{4}}{{O}_{10}}(s)?$

Which among the following factors is the most important in making fluorine the strongest oxidising agent?

1.520 g of hydroxide of a metal on ignition gave 0.995 g of its oxide. The equivalent weight of the metal is

A ball is thrown from a point with a speed ${{\text{v}}_{\text{0}}}$ at an angle of projection $\theta .$ From the same point and at the same instant, a person starts running with a constant speed $\frac{{{v}_{0}}}{2}$ to catch the ball. Will the person be able to catch the ball? If yes, what should be the angle of projection?

In radioactive decay process, the negatively charged emitted (3-particles are

Spherical balls of radius R are falling in a viscous fluid of viscosity $\eta$ with a velocity v. The retarding viscous force acting on the spherical ball is

The mass of the earth is $6 \times 10^{24}\, kg$ and that of the moon is $7.4 \times 10^{22}\, kg$. The potential energy of the system is $-7.79 \times 10^{28}\, J$. The mean distance between the earth and moon is $(G = 6.67 \times 10^{-11}\, N\, m^2kg^{-2})$

A particle moves in a straight line with retardation proportional to its displacement. Its loss of kinetic energy for any displacement $x$ is proportional to

Three point charges $+\,q,-2q$ and $+q$ are placed at points $(x=0,y=a,z=0),$ $(x=0,y=0,z=0)$ and $(x=a,y=0,z=0),$ respectively. The magnitude and direction of the electric dipole moment vector of this charge assembly are

What is the value of inductance L for which the current is a maximum in a series LCR circuit with $C=10\mu F$ and $\omega =1000\,{{s}^{-1}}$ ?

What is wrong about $CO_3^{2-} \, ion ?$

Consider the acidity of the carboxylic acids (i) PhCOOH (ii) $o-NO_2C_6H_4COOH$ (iii) $p-NO_2C_6H_4COOH$ (iv) $m-NO_2C_6H_4COOH$ Which of the following orders is correct?

An aqueous solution of 6.3 g of oxalic acid dihydrate is made upto 250 mL. The volume of $\text{0}\text{.1}\,\text{N}\,\text{NaOH}$ required to completely neutralize 10 mL of this solution is

The wavelength of the radiation emitted, when in a hydrogen atom electron falls from infinity to stationary state one, would be (Rydberg constant $=1.097\times {{10}^{7}}\,{{m}^{-1}}$ )