\(\mathrm{KMnO}_4\) oxidises hydrogen sulphide in acidic medium. The number of moles of \(\mathrm{KMnO}_4\) which react with one mole of hydrogen sulphide is

Assertion (A): Sodium acetate on Kolbe's electrolysis gives ethane. Reason (R): Methyl free radical is formed at cathode.

Which transition metal oxide among the following has electrical conductivity similar to that of copper?

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) \(3 \mathrm{Mg}_{(\mathrm{s})}+\mathrm{N}_{2(\mathrm{~g})} \rightarrow \mathrm{Mg}_3 \mathrm{~N}_{2(\mathrm{~s})}\)

The correct decreasing order of basic strength of \(\mathrm{H}_2 \mathrm{O}, \mathrm{NH}_3, \mathrm{OH}^{-}, \mathrm{NH}_2^{-}\)is

The \(\mathrm{pH}\) of \(0.05 \mathrm{M}\) acetic acid is \(\left(K_a=2 \times 10^{-5}\right)\)

At \(350 \mathrm{~K}\), the vapour pressure of pure liquids \(A\) and \(B\) are \(450 \mathrm{~mm}\) and \(700 \mathrm{~mm}\) respectively. If the total vapour pressure of liquid mixture is \(600 \mathrm{~mm}\) of \(\mathrm{Hg}\), the mole fractions of \(\mathrm{A}\) and \(B\) in vapour phase respectively are :

The distance of the point \((6,4 \sqrt{3})\) from the focus of \(y^2=8 x\) is

In which of the following pairs, the central atoms have the same number of lone pairs of electrons?

The ratio of the areas of the concentric circles \(x^2+y^2-\) \(6 x+12 y+15=0\) and \(x^2+y^2-6 x+12 y-15=0\) is

The point of intersection of the pair of lines \(x^2+x y+2 y^2-3 x+2 y+4=0\) is

If \(\alpha\) and \(\beta(\alpha>\beta)\) are the multiple roots of the equation \(4 x^4+4 x^3-23 x^2-12 x\) \(+36=0\), then \(2 \alpha-\beta=\)

Which one of the following gives yellow precipitate with iodine and \(\mathrm{NaOH}\) solution?