The dioxides and monoxides of elements \(\mathrm{X}\) and \(\mathrm{Y}\) are amphoteric in nature. \(\mathrm{X}\) and \(\mathrm{Y}\) are respectively.

The standard reduction potentials of \(\mathrm{Zn}^{2+}\left|\mathrm{Zn}, \mathrm{Cu}^{2+}\right| \mathrm{Cu}\) and \(\mathrm{Ag}^{+} \mid \mathrm{Cu}\) and \(\mathrm{Ag}^{+} \mid \mathrm{Ag}\) are respectively \(-0.76,0.34\) and \(0.8 \mathrm{~V}\). The following cells were constructed : (1) \(\mathrm{Zn}\left|\mathrm{Zn}^{2+}\right|\left|\mathrm{Cu}^{2+}\right| \mathrm{Cu}\) (2) \(\mathrm{Zn}\left|\mathrm{Zn}^{2+}\right|\left|\mathrm{Ag}^{+}\right| \mathrm{Ag}\) (3) \(\mathrm{Cu}\left|\mathrm{Cu}^{2+} \| \mathrm{Ag}^{+}\right| \mathrm{Ag}\) What is the correct order of \(E_{\text {cell }}^{\circ}\) of these cells?

Which one of the following compounds forms a quaternary salt on reacting with excess methyl iodide?

Observe the following statements regarding purification of bauxite

I. During Hall's process, silica is removed as Si (vapour).

II. Bauxite ore contaminated with \(\mathrm{Fe}_2 \mathrm{O}_3\) is purified in Baeyer's process.

III. During Serpeck's process, AlN is formed.
The correct answer is

The formula of a metal oxide is \(\mathrm{M}_{0.96} \mathrm{O}_1\). The fractions of metal that exists as \(\mathrm{M}^{3+}\) and \(\mathrm{M}^{2+}\) ions in that oxide are respectively

Which of the following chemicals can be used as dry cleaning agents?
a) ${\mathrm{Cl}}_2\mathrm{C}={\mathrm{CCl}}_2$
b) ${\mathrm{CO}}_2$ (liq)
c) ${\mathrm{H}}_2{\mathrm{O}}_2$
d) ${\mathrm{CH}}_3\mathrm{CHO}$

Which of the following is/are "not correct" for ${\mathrm{CH}}_3\mathrm{OH}+{\mathrm{CH}}_3\mathrm{COOH}$ mixture solution? a) ${\mathrm{\Delta H}}_{\mathrm{mix}}<0$ b) Does not obey Raoult's law c) ${\mathrm{\Delta H}}_{mix}>0$ d) An example of ideal solution

Identify the correct statements from the following: (i) \(\mathrm{Ti}(\mathrm{IV})\) is more stable than Ti (III) and Ti (II) (ii) Among 3d-series elements (from \(Z=22\) to 29) only copper has positive reduction potential ( \(\mathrm{M}^{2+} / \mathrm{M}\) ) (iii) Both Sc and Zn exhibit +1 oxidation state

In a triangle \(A B C\), if \(a^2-b^2-c^2=b c\left(\lambda^2-2 \lambda-1\right)\), then

If \(\alpha\) and \(\beta\) are the real roots of the equation \(\sqrt{\frac{5 x}{x-2}}+\sqrt{\frac{x-2}{5 x}}=\frac{29}{10}\) and \(\alpha>\beta\), then \(\sqrt{\alpha^2-11^4 \beta^2}=\)

In a nuclear reactor, the main purpose of the moderator is to

Average \(\mathrm{C}-\mathrm{H}\) bond energy is \(416 \mathrm{~kJ} \mathrm{~mol}^{-1}\). Which of the following is correct?

If \(f\) is differentiable, \(f(x+y)=f(x) f(y)\) for all \(x, y \in \mathbb{R}, f(3)=3, f^{\prime}(0)=11\), then \(f^{\prime}(3)=\)