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Metallic radii of some transition elements are given below. Which of these elements has the highest density?

Element Fe Co Ni Cu

Metallic radii/pm 126 125 125 128

A hollow spherical ball of radius $20\text{cm}$ floats in still water, with half of its volume submerged. Taking the density of water as $1000{\text{kg/m}}^3$, and the acceleration due to gravity as $10{\text{m/s}}^2$, the natural frequency of small oscillations of the ball, normal to the water surface is

(roundoff to 2 decimal places).

Identify the pair of enantiomers amongst the given pairs

A large number of liquid drops each of radius $a$ coalesce to form a single spherical drop of radius $b$. The energy released in the process is converted into kinetic energy of the big drop formed. What will be the speed of the bigger drop, if it starts from rest?

[Given, $T$ is the surface tension and $\rho$ is the density of liquid]

A solution contains 0.1 M $H_{2}S$ and 0.3 M HCl. Calculate the conc. of $S^{2-}$ and $H{S}^{-}$ ions in solution, Given $K_{a_1}$ and $K_{a_2}$ for $H_{2}S$ are ${10}^{-7}$ and $1.3\times {10}^{-13}$ respectively.

The standard potential is given below, of the following at ${25}^{\circ }C$.

$Mn{O}_2\to M{n}^{3+}{E}^{\circ }=0.95V$

$M{n}^{+3}\to M{n}^{2+}{E}^{\circ }=1.51V$

The standard potential of $Mn{O}_2\to M{n}^{2+}$ is :

Choose the correct expression regarding average rate of reaction $\left(r_{avg.}\right)$ and instantaneous rate of reaction $\left(r_{inst.}\right)$:

Arrange the compounds in the order of decreasing boiling points.
1. Ethanol
2. Propane
3. Pentanol

Compute the number of ions present in $5.85\text{g}$ of sodium chloride.

$(\text{Given},N_A=6.022\times {10}^{23},\text{atomic mass of}Na=23\text{u},\text{atomic mass of}Cl=35.5\text{u})$

Chloropicrin is used as

[UPSEAT 2000]

Which one of the following has maximum nucleophilicity?

The dissociation constant of a base $MOH$ is $5.5\times {10}^{-6}$, then calculate the dissociation constant of its conjugate acid.

Theory of ionization was given by

Calculate the solubility of a sparingly soluble salt, $BaS{O}_4$ in $0.02M$ $N{a}_{2}S{O}_4$ solution ?

$(K_{sp}$ for $BaS{O}_4=1.1\times {10}^{-10})$

The number of electrons required to balance the following equation are
$N{O}_3^{-}+4H^{+}+e^{-}⟶2H_{2}O+NO$

Calculate the Van't Hoff factor of 0.1m $Ca{Cl}_2$ (Will the conc (0.1m) affect van't Hoff factor? (Why or why not?)

HNCO (isocyanic acid) has following resonating structures:
$\underset{I}{H-N=C=O}\leftrightarrow \underset{II}{H-\stackrel{\ominus }{N}-C\equiv \stackrel{\oplus }{O}}\leftrightarrow \underset{III}{H-\stackrel{\oplus }{N}\equiv C-\stackrel{\ominus }{O}}$
The order of stability is:

Weight of an object in air is 220 g in water is 180 g and in other liquid is 160 g. Find density of the liquid

Identify the figure of speech in the sentence.
His character is as clean as a pig sty.

Which of the following configuration corresponds to an alkaline earth metal

An organic compound containing nitrogen, sulphur, and oxygen as extra elements is fused with metallic sodium and then extracted with distilled water.

Which of the following species is/are present in the Lassaigne’s extract?