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A stationary hydrogen atom of mass $M$ emits a photon corresponding to the longest wavelength of Balmer series. The recoil velocity acquired by the atom is
($R=$ Rydberg constant and $h=$ planck's constant)

Which of the following are covalent in nature?

The shape and hybridization of PCl₃ molecule is:

Arrange the following compounds in an increasing order of their acidic strengths.

What is meant by 1s electrons shields 2s electrons

What is the difference in properties between H₃O⁺ & H⁺ ?

In Antarctica ozone depletion is due to formation of the following compound.

In which of the following molecules the carbon-chlorine bond is shorter?

Copper is mainly extracted from

To which of the following four types does this reaction belong $B^{-}+R-A^{-}\to B-R+\stackrel{..}{A^{-}}$

If the value of Avogadro number is $6.023\times {10}^{23}mo{l}^{-1}$ and the value of Boltzman constant is $1.380\times {10}^{-23}J{K}^{–}$ then the number of significant digits in the calculated value of the universal gas constant is ___

Which of the following is/are chain isomer(s) of the alkane $C_6{H}_{14}$?

A mixture of 1.57 mol of $N_2$, 1.92 mol of $H_2$ and 8.13 mol of $N{H}_3$ is introduced into a 20 L reaction vessel at 500 K. At this temperature, the equilibrium constant, $K_c$ for the reaction
$N_2\left(g\right)+3H_2\left(g\right)\leftrightarrow 2N{H}_3\left(g\right)is1.7\times {10}^2$
Is the reaction mixture at equilibrium? If not, what is the direction of the net reaction?

Product [X] in the following reaction is:

Which of the following are used as fertilizers?

Which of the following ins not an actionid?
(a) Curium (Z= 96)
(b) Californium (Z= 98)
(c) Uranium (Z = 92)
(d) Terbium (Z = 65)

The following compounds are given to you:
2- Bromopentane, 2- Bromo - 2 methyl butane, 1- Bromopentane.
(a) Write the compound which is most reactive towards SN2 reaction.
(b) Write the compound which is optically active.
(c) Write the compound which is most reactive towards β- elimination reaction.

Which of the following do not have unpaired $e^{-}$?

The enthalpies for the following reactions at 25°C are given.
$\frac{1}{2}{H}_2\left(g\right)+\frac{1}{2}{O}_2\left(g\right)\to OH\left(g\right);△H=10.06Kcal$
$H_2\left(g\right)\to 2H\left(g\right);△H=104.18Kcal$
$O_2\left(g\right)\to 2O\left(g\right);△H=118.32Kcal$

Calculate the OH bond energy in the O - H group

The density of 3M solution of NaCl is 1.25 gram per ml . Calculate molality of the solution.

In octahedral holes (voids)

Select the correct reaction(s).

Given that the abundances of isotopes ${}^{54}Fe$ , ${}^{56}Fe$ and ${}^{57}Fe$ are 5 % , 90 % and 5%.

Respectively,the atomic mass of Fe is

The hybrid states of C in diamond and graphite are respectively:

A compound which is not a constitution isomer ofis

Two oxides of metal contain 50% and 40% of metal M respectively, if the formula of the first oxide is MO_{​​​​​2}, the formula of the second oxide is?

1 mol of $HI$ is converted into $H_2$ and $I_2$ at 400 K. What would be the value of $K_p$ if $\frac{2}{3}rd$ of $HI$ is left at equilibrium?

Which of the following can't be used in Friedal Craft's reactions

The value of $n_2+n_1$ and $n_2^2-n_1^2$ for $H{e}^{+}$ ion in atomic spectrum are 4 and 8 respectively. The wavelenght of emitted photon when electron jump from $n_2$ to $n_1$ is:

Question 32

Using molecular orbital theory, compare the bond energy and magnetic character of $O_2^{+}$ and $O_2^{+}$ species.

In a reaction, $A+B\to$ Product, rate is doubled when the concentration of B is doubled and rate increases by a factor of 8 when the concentrations of both the reactants (A and B) are doubled. Rate law for the reaction can be written as :

The oxidation number of Mg in Mg⁺² is

The boiling point of C6H6 , CH3OH , C6H5NH2 and C6H5NO2 are 800C , 650C , 1840C and 2120C respectively. Which will show highest vapour pressure at room temperature?

The standard redox potential for reactions Mn^{​​​​​2+}+2e -----> Mn and Mn^{​​​​​3+} +1e -----> Mn^{​​​​​2+} are 2.36 and 1.51V respectively . What is the redox potential for the reaction Mn^{​​​​​3+}+3e------> Mn ?

Calculate the wavelength of radiation emitted when an electron falls from third excited state to ground state in the Lyman series of Hydrogen atom.
($R_H=1.1\times {10}^7{m}^{-1})$

Which of the following arrangements shows schematic alignment of magnetic moments of antiferromagnetic substances ?

In interstitial defect, constituent particles occupy an interstitial site, so there should also be a vacancy from where atoms or molecules are displaced ?

Arrange the following compounds in order of increasing reactivity towards nucleophilic substitution.

Which of the following alkali metal ions has the lowest mobility in aqueous solution?

What is the no. Of moles of O atom in 126 amu of HNO_{​​​​3.}