Which of the following is a neurologically active drug?

In the extraction of silver, zinc metal is used as a reducing agent. What is the molecular structure of the zinc complex formed in this reaction?

Which of the following nitrates on heating does not give its oxide?

Assertion (A)
The first ionisation energy of Be is greater than that of \(\mathrm{B}\).
Reason (R) \(2 p\) orbital has lower energy than \(2 s\) orbital.

The molar conductivities $\left({\mathrm{\lambda }}_{\mathrm{m}}^0\right)$ at infinite dilution of $\mathrm{KBr}, \mathrm{HBr}$ and ${\mathrm{KNH}}_2$ are $120.5,420.6$ and $90.48 \mathrm{S}{ \mathrm{cm}}^2{ \mathrm{mol}}^{-1}$ respectively. Find the value of ${\mathrm{\lambda }}_{\mathrm{m}}^0$ for ${\mathrm{NH}}_3$.

For \(\mathrm{NaCl}\), the number of Schottky pairs per \(\mathrm{cm}^3\) at room temperature is

Which of the following will have the highest \(\mathrm{pH}\) ?

The area of the region (in sq. units) enclosed between the curves \(y=|x|, y=[x]\) and the ordinates \(x=-1, x=0, x=1\) is

Let \(f: \mathrm{A} \rightarrow \mathrm{B}\) and \(g: \mathrm{B} \rightarrow \mathrm{C}\) be any two functions and \(g \circ f: \mathrm{A} \rightarrow \mathrm{C}\) is one-one, then

The ratio of de-Broglie wavelengths of two particles having mass ratio \(1: 3\) and kinetic energy ratio \(2: 1\) is

An $\alpha$ -particle moves in a circular path of radius $1 \mathrm{cm}$ in a uniform magnetic field of $0.125 \mathrm{T}$. The de Broglie wavelength associated with the $\alpha$ -particle is

Using the standard electrode potentials given below identify the correct statements from the following.
\[
\begin{aligned}
\mathrm{Fe}^{2+}+2 e^{-} \longrightarrow \mathrm{Fe} ; E^{\circ} & =-0.44 \mathrm{~V} \\
\mathrm{Cu}^{2+}+2 e^{-} \longrightarrow \mathrm{Cu} ; E^{\circ} & =+0.34 \mathrm{~V} \\
\mathrm{Ag}^{+}+e^{-} \longrightarrow \mathrm{Ag} ; E^{\circ} & =+0.80 \mathrm{~V}
\end{aligned}
\]
(i) Copper can displace iron from \(\mathrm{FeSO}_4\) solution.
(ii) Iron can displace copper from \(\mathrm{CuSO}_4\) solution.
(iii) Silver can displace copper from \(\mathrm{CuSO}_4\) solution.
(iv) Iron can displace silver from \(\mathrm{AgNO}_3\) solution.

\(\text { If } y=\operatorname{Tan}^{-1}\left(\frac{x}{1+2 x^2}\right)+\operatorname{Tan}^{-1}\left(\frac{x}{1+6 x^2}\right) \text {, then } \frac{d y}{d x}=\)