A sample of \(4.5\,mg\) of an unknown monohydric alcohol, \(R - OH\) was added to methylmagnesium iodide. A gas is evolved and is collected and its volume measured to be \(3.1\,mL\). The molecular weight of the unknown alcohol is \(g / mol\). [Nearest integer]

Number of compounds from the following with zero dipole moment is _______. \(\mathrm{HF}, \mathrm{H}_2, \mathrm{H}_2 \mathrm{~S}, \mathrm{CO}_2, \mathrm{NH}_3, \mathrm{BF}_3, \mathrm{CH}_4, \mathrm{CHCl}_3, \mathrm{SiF}_4\), \(\mathrm{H}_2 \mathrm{O}, \mathrm{BeF}_2\)

Which of the following statements are correct, if the threshold frequency of caesium is \(5.16 \times 10^{14} \mathrm{~Hz}\) ?
A. When Cs is placed inside a vacuum chamber with an ammeter connected to it and yellow light is focused on Cs the ammeter shows the presence of current.
B. When the brightness of the yellow light is dimmed, the value of the current in the ammeter is reduced.
C. When a red light is used instead to the yellow light, the current produced is higher with respect to the yellow light.
D. When a blue light is used, the ammeter shows the formation of current.
E. When a white light is used, the ammeter shows formation of current.
Choose the correct answer from the options given below :

Arrange the following Cobalt complexes in the order of increasing Crystal Field Stabilization Energy \((CFSE)\) value. Complexes : \(\left[\mathrm{CoF}_{6}\right]^{3-},\left[\mathrm{Co}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+},\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+}\) and \(\left[\mathrm{Co}(\mathrm{en})_{3}\right]^{3+}\) \(\quad\quad\quad\quad\quad\quad A\quad\quad\quad\quad \quad B\quad\quad\quad\quad\quad\quad C\quad\quad\quad\quad\quad\quad D\) Choose the correct option:

The correct order of bond dissociation energy among \(N_2, O_2, O_2^-\) is shown in which of the following arrangements?

The incorrect postulates of the Dalton's atomic theory are : \((A)\) Atoms of different elements differ in mass. \((B)\) Matter consists of divisible atoms. \((C)\) Compounds are formed when atoms of different element combine in a fixed ratio. \((D)\) All the atoms of given element have different properties including mass. \((E)\) Chemical reactions involve reorganisation of atoms. Choose the correct answer from the options given below :

Identify the incorrect statement from the following :

The region in the electromagnetic spectrum where the Balmer series lines appear is

A fly wheel having mass 3 kg and radius 5 m is free to rotate about a horizontal axis. A string having negligible mass is wound around the wheel and the loose end of the string is connected to a 3 kg mass. The mass is kept at rest initially and released. Kinetic energy of the wheel when the mass descends by 3 m is ___________ J. (\(g=10~m/s^{2}\))

On which of the following lines lies the point of intersection of the line, \(\frac{{x - 4}}{2} = \frac{{y - 5}}{2} = \frac{{z - 3}}{1}\) and the plane, \(x + y + z = 2\) ?

If \(0 <  x , y < \pi\) and \(\cos x +\cos y-\cos ( x + y )=\frac{3}{2},\) then \(\sin x+\cos y\) is equal to ...... .

Considering only the principal values of inverse functions, the set \(A = \left\{ {x \geq \,:\,{{\tan }^{ - 1}}\,\left( {2x} \right) + {{\tan }^{ - 1}}\,\left( {3x} \right)\, = \frac{\pi }{4}} \right\}\)

Which of the following is the correct IUPAC name of given organic compound \((\mathrm{X})\) ?