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The energy of second Bohr orbit of the hydrogen atom is $-328{\text{kJ mol}}^{-1}$; hence the energy of fourth Bohr orbit would be

An isomer of the complex $CoBrC{l}_2\left(en{)}_2\right(H_{2}O)$, on reaction with concentrated $H_{2}S{O}_4$ (dehydrating agent), suffers no loss in weight and on reaction with $AgN{O}_3$ solution it gives only white precipitate, which is soluble in $N{H}_3$ solution.



The correct formula of the complex is:

The electronic configuration of $Sc$ is:

Compound A, $C_8{H}_{10}O$, is found to react with $NaOI$ (produced by reacting Y with $NaOH$) and yields a yellow precipitate with a characteristic smell.

A and Y are respectively:

The activation energies for the forward and reverse elementary reactions in the system $A\rightleftharpoons B$ are 10.303 and 8.000 k cal respectively at 500K. Assuming the pre-exponential factor to be the same for both the forward and reverse steps and R = 2 cal $K^{-1}mo{l}^{-1}$, calculate equilibrium constant of the reaction :

Formula mass is used for which of the following substances?

Arrange the following elements in the increasing order of their metallic character.

$Si,Be,Mg,Na,P$

Which of the following are ring chain isomers of $C_4{H}_8$?

Which of the following carbocation is most stable?

Which of the following is an E-isomer?

The vapour pressure of water is $15.6\text{kPa}$ at $333\text{K}$. Calculate the vapour pressure of 3 molal solution of a solute in it.

Which of the following radicals is trivalent?

Write down the
reactions taking place in different zones in the blast furnace

during the extraction
of iron.

The most stable carbonium ion among the following is

Energy of an electron is given by

$E=-2.178\times {10}^{-18}J\left(\frac{Z^2}{n^2}\right)$ wavelength of light required to excite an electron in an hydrogen atom from level n = 1 to n = 2 will be

$(h=6.62\times {10}^{-34}Jsandc=3.0\times {10}^{8}m{s}^{-1})$

If $K_{sp}$ of a salt $A_2{B}_3$ is given by $1\times {10}^{-25}$. Then find the $s^5$ of the salt?

Here 's' is solubility.

How many alcohol with molecular $C_4{H}_{10}O$ are chiral in nature?
(a) 1
(b) 2
(c) 3
(d) 4

The reaction of chloroform with alcoholic KOH and p-toluidine results in the formation of :

X,Y atoms crystallize in a cubic lattice . X atoms are present at the corners while Y atoms are at face centers. What would be the simplest formula of the compound if one of the Y atoms is missing from a face centre in each unit cell?

Identify the correct order of reactivity in electrophillic substitution reactions of the following compounds

The given statement is "higher the value of Henry's law constant, the lower is the solubility of gas in liquid"

Is the statement correct

Explain with reasons

In a double slit experiment, when a thin film of thickness $t$ having refractive index $\mu$ is introduced in front of one of the slits, the maximum at the centre of the fringe pattern shifts by one fringe width. The value of $t$ is ($\lambda$ is the wavelength of the light used) :

What
are the oxidation number of the underlined elements in each of the
following and how do you rationalise your results?

(a)
KI₃
(b) H₂S₄O₆
(c) Fe₃O₄
(d) CH₃CH₂OH
(e) CH₃COOH

The standard enthalpies of formation at 300 K for $CC{l}_4\left(l\right),H_{2}O\left(g\right),C{O}_2\left(g\right)andHCl\left(g\right)$ are -107, -242, -394, and -93 $kJmo{l}^{-1}$ respectively. The value of $\Delta U$ for the reaction
$CC{l}_4\left(l\right)+2H_{2}O\left(g\right)\to C{O}_2\left(g\right)+4HCl\left(g\right)$
at 300 K is:

Molar specific heat of oxygen at constant pressure $C_p=7.2cal/mol{/}^{\circ }C$ and $R=8.3J/mol/K.$ At constant volume, 5 mol of oxygen is heated from ${10}^{\circ }C$ to ${20}^{\circ }C$, the quantity of heat required is approximately

Lead pipes are not suitable for drinking water because