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

Which of the following is not correctly matched for enzymatic reactions?

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

Identify the reactions in which dichromate acts as an oxidising reagent.
I. \(\mathrm{Cr}_2 \mathrm{O}_7^{2-}+6 \mathrm{Fe}^{2+}+14 \mathrm{H}^{+} \longrightarrow 2 \mathrm{Cr}^{3+}+6 \mathrm{Fe}^{3+}+7 \mathrm{H}_2 \mathrm{O}\)
II. \(\mathrm{Cr}_2 \mathrm{O}_7^{2-}+2 \mathrm{OH}^{-} \longrightarrow 2 \mathrm{CrO}_4^{2-}+\mathrm{H}_2 \mathrm{O}\)
III. \(\mathrm{Cr}_2 \mathrm{O}_7^{2-}+6 \mathrm{I}^{-}+14 \mathrm{H}^{+} \longrightarrow 2 \mathrm{Cr}^{3+}+3 \mathrm{I}_2+7 \mathrm{H}_2 \mathrm{O}\)
IV. \(\mathrm{Na}_2 \mathrm{Cr}_2 \mathrm{O}_7+2 \mathrm{KCl} \longrightarrow \mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7+2 \mathrm{NaCl}\)

The resistance of a conductivity cell filled with 0.1 M KCl solution is \(100 \Omega\). If the resistance of the same cell when filled with \(0.2 \mathrm{M}\) \(\mathrm{KC} \ell\) solution is \(520 \Omega\), the molar conductivity of \(0.02 \mathrm{M}\) solution (in S \(cm^2\) \(\mathrm{mol}^{-1}\) ) is
(Given : conductivity of 0.1 M KCl solution \(=1.29 \mathrm{Sm}^{-1}\) )

Which pair of actinides exhibit the highest oxidation state of +7 ?

Which of the following will form an ideal solution?

If \(\int \frac{d x}{\sqrt{\sin ^3 x \cos x}}=g(x)+c\), then \(g(x)\) is equal to

A disc of mass \(100 \mathrm{~g}\) slides down from rest on an inclined plane of \(30^{\circ}\) and come to rest after travelling a distance of \(1 \mathrm{~m}\) along the horizontal plane. If the coefficient of friction is 0.2 for both inclined and horizontal planes, then the work done by the frictional force over the whole journey, approximately, is (Acceleration due to gravity, \(g=10 \mathrm{~ms}^{-1}\) )

A beam of light with intensity ${10}^{-3} \mathrm{N} {\mathrm{m}}^{-2}$ and cross sectional area $20 {\mathrm{cm}}^2$ is incident on a fully reflective surface at angle $45°$. Then the force exerted by the beam on the surface is

In a region, the electric field is \((30 \bar{i}+40 \bar{j}) \mathrm{NC}^{-1}\). If the electric potential at the origin is zero, the electric potential at the point \((1 \mathrm{~m}, 2 \mathrm{~m})\) is

$(\sin \theta -i\cos \theta {)}^3$ is equal to

A block of mass 10 kg moving with a speed of \(5 \hat{\mathrm{i}} \mathrm{m} \mathrm{s}^{-1}\) on a frictionless horizontal surface suddenly explodes into two pieces. If one piece with mass 4 kg moves with a speed of \(10 \hat{\mathrm{i}} \mathrm{m} \mathrm{s}^{-1}\), then the velocity of the second piece is