Which of the following molecules have three bond pairs but different shape?
(i) \(\mathrm{BCl}_3\)
(ii) \(\mathrm{H}_2 \mathrm{~S}\)
(iii) \(\mathrm{PH}_3\)
(iv) \(\mathrm{AsF}_5\)

The highest magnetic moment is shown by the transition metal ion with the configuration

How many molecules of CO\(_2\)(g) are obtained on reaction of 24 grams of methane with 4moles of oxygen?

Ozone in stratosphere is depleted by

The enthalpy of neutralisation of \(\mathrm{HCl}\) and \(\mathrm{NaOH}\) is \(x \mathrm{~kJ}\). The heat evolved, when \(500 \mathrm{~mL}\) of \(2 \mathrm{~N} \mathrm{HCl}\) is mixed with \(250 \mathrm{~mL}\) of \(4 \mathrm{~N} \mathrm{NaOH}\) will be

From the given covalent compounds (A to F) identify the pair of molecules which have:
(i) Two lone pairs of electrons on the central atom.
(ii) One lone pair of electrons on the central atom.
A. \(\mathrm{SO}_2\)
B. \(\mathrm{ClF}_3\)
C. \(\mathrm{BF}_3\)
D. \(\mathrm{BrF}_5\)
E. \(\mathrm{XeF}_4\)
F. \(\mathrm{SF}_6\)

An organic compound is boiled with alcoholic potash. The product is cooled and acidified with HCl. A white solid separates out. The starting compound may be

The reducing agent which is used to reduce iron oxide in blast furnace is

The sum of non-prime positive divisors of 450 is

In an adiabatic process,

The acceleration of a train between two stations is shown in the figure. The maximum speed of the train is

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

A vertical circular coil of radius \(0.1 \mathrm{~m}\) and having \(10\) turns carries a steady current. When the plane of the coil is normal to the magnetic meridian, a neutral point is observed at the centre of the coil. If \(B_{H}=0.314 \times 10^{-4} \mathrm{~T}\), the current in the coil is