Which of the following reagents when heated with ethyl chloride, forms ethylene ?

Elements of which of the following group(s) of periodic table do not form hybrides?

Calculate the mass of an elementary particle, which is accelerated to twice the velocity of light with the precision \(\pm 1 \%\) and has \(1.05 \times 10^{-13} \mathrm{~m}\) uncertainty in position. \(\left(h=6.6 \times 10^{-34} \mathrm{~kg} \mathrm{~m}^2 \mathrm{~s}^{-1}\right)\)

When ' \(\mathrm{X}\) ' \(\mathrm{g}\) of graphite is completely burnt in a bomb calorimeter in excess of \(\mathrm{O}_2\) at \(298 \mathrm{~K}\) and \(1 \mathrm{~atm}\) pressure as given in the equation
\(\mathrm{C}\) (graphite) \(+\mathrm{O}_2(\mathrm{~g}) \rightarrow \mathrm{CO}_2(\mathrm{~g})\)
The temperature of calorimeter raised from \(298 \mathrm{~K}\) to \(302 \mathrm{~K}\). If the heat capacity of the calorimeter and molar enthalpy change for the reaction at \(1 \mathrm{~atm}\) and \(298 \mathrm{~K}\) are \(20.7 \mathrm{~kJ} \mathrm{~K}^{-1}\) and \(-248.4 \mathrm{~kJ} \mathrm{~mol}^{-1}\), ' \(\mathrm{X}^{\prime}\) in \(\mathrm{g}\) is

Match the following


The correct answer is

If molten $\mathrm{NaCl}$ contains ${\mathrm{SrCl}}_2$ as impurity, crystallization can generate

In ruby and emerald, the metal ion(s) present is/are

If the function \(f(x)=\sqrt{x^2-4}\) satisfies the Lagrange's mean value theorem on \([2,4]\), then the value of C is

A Young double slit experimental setup is immersed in water of refractive index $1.33 .$ It has slit separation $1 \mathrm{mm}$ and the distance between slits and screen is $1.33 \mathrm{m}$. If the wavelength of incident light on slits is $6300 \mathrm{A}$ then the fringe width on screen is

The roots
\(\begin{aligned}
& (x-a)(x-a-1)+(x-a-1)(x-a-2) \\
& +(x-a)(x-a-2)=0, a \in R \text { are always }
\end{aligned}\)

Identify the correct set of 13 th group elements which do not form amphoteric oxides?

A light of frequency \(1.6 \times 10^{16} \mathrm{~Hz}\) when falls on a metal plate emits electrons that have double the kinetic energy compared to the kinetic energy of emitted electrons when frequency of \(1.0 \times 10^{16} \mathrm{~Hz}\) falls on the same plate. The threshold frequency \(\left(v_0\right)\) of the metal in \(\mathrm{Hz}\) is

Depth of a river is 100 m . Magnitude of compressibility of the water is \(0.5 \times 10^{-9} \mathrm{~N}^{-1} \mathrm{~m}^2\). The fractional compression in water at the bottom of the river is (Acceleration due to gravity \(=10 \mathrm{~ms}^{-2}\) )