Benzoin is

Given that the standard enthalpy of combustion of \(\mathrm{C}_{(\mathrm{S})}\) and \(\mathrm{CS}_2(\mathrm{l})\) are -393.3 and \(-1108.76 \mathrm{~kJ} / \mathrm{mol}\) respectively and the standard enthalpy of formation of \(\mathrm{CS}_2\) is \(128.02 \mathrm{~kJ} / \mathrm{mol}\). What is \(\Delta H_f^0\) of \(\mathrm{SO}_2\) ?

The electronic configuration of the element with atomic number 78 is:

Aniline undergoes reactions with reagents given in the order shown
(i) Aqueous \(\mathrm{Br}_2\)
(ii) \(\mathrm{NaNO}_2 / \mathrm{HCl} / 0^0 \mathrm{C}\)
(iii) Hypophosphorous acid
What is the product formed at the end of these reactions?

\(p\)-toluene sulphonic acid on fusion with solid
KOH at 573 K followed by treatment with dilute
HCl gives

Two statements, One Assertion (A) and the other Reason (R) are given. Choose the right option.
Assertion: The rate constant \((\mathrm{k})\) for a chemical reaction gets nearly doubled for a \(10^{\circ}\) rise in temperature.
Reason: The number of bimolecular collisions between reactant molecules increase with increase in temperature

A mixture of methylamine and dimethyl amine is given to you. The reagents used to separate the components of the mixture are

\(\mathrm{N}_2 \mathrm{O}_5\) decomposes to \(\mathrm{NO}_2\) and \(\mathrm{O}_2\) and follow first order kinetics. After 50 minutes, the pressure inside the vessel increases from 50 mm Hg to 87.5 mm Hg. The pressure of the gaseous mixture after 100 minutes at constant temperature will be [Nearest integer]

On each working day of a school there are six periods. The number of ways in which five subjects are arranged if each subject is allotted at least one period and no period remains vacant is

A die is thrown twice and the sum of numbers appearing is observed to be 8 . What is the conditional probability that the number 5 has appeared atleast once?

Given below are 4 equations showing Molar conductivities at infinite dilution of various electrolytes. Which one of them represents the correct equation?
\(\begin{aligned}
& \left(\Lambda_m^0\right)_{N a B r}-\left(\Lambda_m^0\right)_{N a C l}=\left(\Lambda_m^0\right)_{\mathrm{KCl}}-\left(\Lambda_m^0\right)_{\mathrm{KBr}} \\
& \left(\Lambda_m^0\right)_{\mathrm{HCl}}+\left(\Lambda_m^0\right)_{\mathrm{KOH}}-\left(\Lambda_m^0\right)_{\mathrm{KCl}}=\left(\Lambda_m^0\right)_{\mathrm{H}_2 \mathrm{O}} \\
& \left(\Lambda_m^0\right)_{\mathrm{KBr}}-\left(\Lambda_m^0\right)_{\mathrm{NaBr}}=\left(\Lambda_m^0\right)_{\mathrm{NaBr}}-\left(\Lambda_m^0\right)_{\mathrm{Nal}} \\
& \left(\Lambda_m^0\right)_{N H_4 \mathrm{Cl}}-\left(\Lambda_m^0\right)_{\mathrm{NH}_4 \mathrm{NO}_3}=\left(\Lambda_m^0\right)_{N H_4 \mathrm{Cl}}-\left(\Lambda_m^0\right)_{N H 4 B r}
\end{aligned}\)

The Enthalpy of combustion of 1.0 mole of a reactive metal X at \(27^{\circ} \mathrm{C}\) and 1.0 bar pressure to form a solid oxide (XO) is \(-601.83 \mathrm{~kJ} / \mathrm{mol}\). The Internal energy change for this reaction is ______ kJ .
\(\left(\mathrm{R}=8.314 \mathrm{j} \mathrm{~K}^{-1} \mathrm{~mol}^{-1}\right)\)

Conjugate acid of \(\mathrm{NH}_{2}^{-}\)is