Assertion (A) The boiling points of noble gases increases from He to Xe.

Reason (R) The interatomic van der Waals' attractive forces increases from \(\mathrm{He}\) to \(\mathrm{Xe}\).
The correct answer is

Which one of the following is used in the preparation of cellulose nitrate?

Which of the following are disproportionation reactions?
\((\mathrm{g}=\sigma, l=(ద, \mathrm{aq}=\text { జe, } \mathrm{s}=\text { ఘ) }\)
(A) \(2 \mathrm{NO}_{2(\mathrm{~g})}+2 \mathrm{NaOH}_{(\mathrm{aq})} \rightarrow \mathrm{NaNO}_{2(\mathrm{aq})}+\mathrm{NaNO}_{3(\mathrm{aq})}+\mathrm{H}_2 \mathrm{O}_{(l)}\)
(B) \(\mathrm{Cl}_{2(\mathrm{~g})}+2 \mathrm{NaOH}_{(\mathrm{aq})} \rightarrow \mathrm{NaClO}_{(\mathrm{aq})}+\mathrm{NaCl}_{(\mathrm{aq})}+\mathrm{H}_2 \mathrm{O}_{(\mathrm{l})}\)
(C) \(3 \mathrm{ClO}^{-} \rightarrow 2 \mathrm{Cl}^{-}+\mathrm{ClO}_3^{-}\)
(D) \(3 \mathrm{Mg}_{(\mathrm{s})}+\mathrm{N}_{2(\mathrm{~g})} \rightarrow \mathrm{Mg}_3 \mathrm{~N}_{2(\mathrm{~s})}\)

In thin layer chromatography, a substance moved by a distance of \(4 \mathrm{~cm}\), where as the solvent moved by a distance of \(5 \mathrm{~cm}\). Then the value of retardation factor \(\left(R_f\right)\) is

What are the major products X and Y respectively in the following reactions?
\(\begin{aligned}
& \left(\mathrm{CH}_3\right)_3 \mathrm{CONa}+\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{Br} \rightarrow \mathrm{X} \\
& \left(\mathrm{CH}_3\right)_3 \mathrm{CBr}+\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{ONa} \rightarrow \mathrm{Y}
\end{aligned}\)

Which of the following sets of reagents convert toluene to benzaldehyde?
A. \(\mathrm{Cl}_2 \mid \mathrm{h} v ; \mathrm{H}_2 \mathrm{O}, \Delta\)
B. \(\mathrm{Cl}_2 \mid \mathrm{Fe} ; \mathrm{H}_2 \mathrm{O}\)
C. \(\mathrm{KMnO}_4 \mid \mathrm{OH}^{-} ; \mathrm{H}^{+}\)
D. \(\mathrm{CrO}_2 \mathrm{Cl}_2 \mid \mathrm{CS}_2 ; \mathrm{H}_3 \mathrm{O}^{+}\)

At 290 K , a vessel (I) contains equal moles of three liquids (A, B, C). The boiling points of A, B and C are 350,373 and 308 K respectively. Vessel (I) is heated to 300 K and vapours were collected into vessel (II). Identify the correct statements. (Assume vessel (I) contains liquids and vapours and vessel (II) contains only vapours)
I. Vessel - I is rich in liquid \(B\)
II. Vessel - II is rich in vapour of C
III. The vapour pressures of A, B, C in Vessel (I) at 290 K follows the order \(\mathrm{C}\gt\mathrm{A}\gt\mathrm{B}\).

If the area of a right angled triangle with hypotenuse 5 is maximum, then its perimeter is

The ratio of de-Broglie wavelength of molecules of hydrogen and helium which are at temperatures \(27^{\circ} \mathrm{C}\) and \(127^{\circ} \mathrm{C}\) respectively is

The wavelengths of light absorbed by the complexes \(\left[\mathrm{Ni}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+},\left[\mathrm{Ni}(\mathrm{en})_3\right]^{2+},\left[\mathrm{Ni}\left(\mathrm{H}_2 \mathrm{O}\right)_4 \mathrm{en}\right]^{2+}\) are \(\lambda_1, \lambda_2, \lambda_3\) respectively. The correct order of wavelengths is

A boat running downstream covers a distance of \(16 \mathrm{~km}\) in 2 hours while for covering the same distance upstream, it takes 4 hours. What is the speed of the boat in still water?

The combined equation of the diagonals of the square formed by the two pairs of straight lines given by \(x y+4 x-3 y-12=0\) and \(x y-3 x+4 y-12=0\) is

Which of the following is not a RNA?