List of practice Questions

When phenol is treated with chloromethane in presence of $AlCl_3$ we get
Pure water is neutral because
The ebullioscopic constant is the elevation in boiling point produced by
Which one of the following order is correct for the first ionisation energies of the elements ?
In the Molisch reagent, the substance used is
If $A= \begin{bmatrix}1&2\\ 0&1\end{bmatrix} $, then $A^n$ is
The number of distinct real roots of $\begin{vmatrix}\sin x&\cos x&\cos x\\ \cos x&\sin x&\cos x\\ \cos x &\cos x&\sin x\end{vmatrix}$ in the interval $ \left[\frac{-\pi}{4}, \frac{\pi}{4}\right] $ is
$\displaystyle\lim_{n\to\infty} \frac{\left(1^{2} +2^{2} + ....+n^{2}\right) \sqrt[n]{n}}{ \left(n+1\right)\left(n+10\right)\left(n+100\right)} = $
The solution of the differential equation $\frac{dy}{dx} = (x +y)^2$ is
In a $CE$ amplifier $\beta = 50, R_L = 4 \, k\Omega , R_1 = 500 \, \Omega $. Power gain of the amplifier is
The $pH$ value of $1 \times 10^{-4} \,M \,NaOH$ solution is
When light wave suffers reflection at the interface between air and glass, the change of phase of reflected wave is equal to
The chemical entities present in thermosphere of the atmosphere
The figure shows the p-V plot an ideal gas taken through a cycle ABCDA. The part ABC is a semi-circle and CDA is half of an ellipse. Then,
Half-life period of a first order reaction is $1386\, s.$ The specific rate constant of the reaction is
The degree of dissociation of a $ 0.01\, M $ weak acid is $ 10^{-3} $ . Its $ pOH $ is
Magnetic field at the centre of a coil in the form of a square of side $ 2\,cm $ carrying a current of $ 1.414\,A $ is
A uniformly wound coil of self-inductance $ 1.2\times 10^{-4}H $ and resistance $ 3\,\Omega $ . is broken up into two identical coils. These coils are then connected parallel across a $ 6\,V $ battery of negligible resistance. The time constant for the current in the circuit is (neglect mutual inductance)
How much volume of oxygen at $STP$, in litre is required to burn $4\,g$ of methane gas completely?
If the de-Broglie wavelength of a particle of mass $m$ is $100$ times its velocity then its value in terms of its mass $ (m) $ and Plants constant $ (h) $ is
Which one of the following aqueous solutions of salts has the lowest, pH value?
The non-existant metal carbonyl among the following is
A body is projected up from the surface of the earth with a velocity equal to $( \frac{3}{4}th )$ of its escape velocity. If $R$ be the radius of earth, the height it reaches is
In an experiment demonstrating the evolution of oxygen in Hydrilla, Sodium bicarbonate is added to water in the experimental set-up. What would happen if all other conditions are favourable ?
A junction diode has a resistance of 25 O when forward biased and 2500 O when reverse biased. The current in the diode, for the arrangement shown will be