In a colloidal solution, both the dispersed phase and dispersion medium are in liquid phase. What is the type of colloid ?

The Product(s) of the reaction
\(\mathrm{NaBH}_4+\mathrm{I}_2 \longrightarrow\) 'Products' is/are

Match List - I, with List - II

Correct answer is

The number of octahedral and tetrahedral holes respectively present in a hexagonal close packed ( \(h c p)\) crystal of ' \(X\) ' atoms are

Bond enthalpy of \(\mathrm{Ge}-\mathrm{Ge}\) bond is \(260 \mathrm{~kJ} \mathrm{~mol}^{-1}\). The bond enthalpies of Si-Si and \(\mathrm{Sn}-\mathrm{Sn}\) bonds in \(\mathrm{kJ} \mathrm{mol}^{-1}\) are respectively

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. \(\mathrm{Na}_2 \mathrm{Cr}_2 \mathrm{O}_7+2 \mathrm{KCl} \longrightarrow \mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7+2 \mathrm{NaCl}\)

Order of acidity of benzoic acid (I), 4-methoxybenzoic acid (II), acetic acid (III) and 4-nitrobenzoic acid (IV) is

Calculate the density of an aqueous solution of KI, if its molarity and molality are \(1.44 \mathrm{M}\) and \(1.5 \mathrm{~mol} \mathrm{~kg}^{-1}\) respectively.

Let the locus of the point of intersection of the perpendicular tangents drawn to the circle \(x^2+y^2+6 x\) \(-4 y-12=0\) be the circle \(S\). Then the equation of the tangent drawn to \(\mathrm{S}\) which is perpendicular to the line \(6 \mathrm{x}-4 \mathrm{y}+\mathrm{k}=0\) is

The line \(a x+b y+c=0\) is normal to the circle \(x^2+y^2+2 g x+2 f y+d=0\) if

The number of protons, neutrons and electrons in ${}_6{}^{13}C$ respectively are

In a triangle \(A B C\), if \(a, b, c\) are in arithmetic progression and the angle \(A\) is twice the angle C, then \(\cos \mathrm{A}: \cos \mathrm{B}: \cos \mathrm{C}=\)

Three Carnot engines operate in series between a heat source at temperature \(T_1\) and heat sink at a temperature \(T_4\). There are two other reservoirs at temperatures \(T_2\) and \(T_3\). The three engines are equally efficient, if (given that, \(\left.T_1>T_2>T_3>T_4\right)\)