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Given

;
Δ_rH^θ
= –92.4 kJ mol^–1

What
is the standard enthalpy of formation of NH₃
gas?

If the degree of ionisation of a decimolar solution of a weak acid $HA$ is $0.01$ , then $p{K}_a$ of acid is:

Arrange $Si,Be,Mg,Na$ and $P$ in the decreasing order of their metallic character.

At ${25}^{\circ }C$ molar conductance of $0.1$ molar aqueous solution of ammonium hydroxide is $9.52$ ${\text{ohm}}^{-1}{\text{cm}}^2{\text{mol}}^{-1}$ and at infinite dilution its molar conductance is $238$ ${\text{ohm}}^{-1}{\text{cm}}^2{\text{mol}}^{-1}$. The percentage degree of dissociation of ammonium hydroxide at the same concentration and temperature is:

[1 Mark]

Which
compound in each of the following pairs will react faster in S_N2
reaction with OH⁻?

(i)
CH₃Br
or CH₃I

(ii)
(CH₃)₃CCl
or CH₃Cl

The unit of vander waals constant ${}^{\prime }{a}^{\prime }$ is:
(correct answer +1, wrong answer -0.25)

The value of azimuthal quantum number (l) and magnetic quantum number (m) for the outermost electron in $C{l}^{-}$ ion are:

An ester (A) with mol. formula $C_9{H}_{10}{O}_2$ was treated with excess $C{H}_3-MgBr$ and the complex so formed was treated with $H_{2}S{O}_4$ to give on olefin (B). Ozonolysis of (B) gave a ketone with molecular formula $C_8{H}_{8}O$ which shows the iodoform test. The structure of (A) is -

Enthalpy of sublimation of a substance is equal to
(a) enthalpy of fusion + enthalpy of vaporisation
(b) enthalpy of fusion
(c) enthalpy of vaporisation
(d) twice the enthalpy of vaporisation

Explain [Co(NH₃)₆]³⁺
is an inner orbital complex whereas [Ni(NH₃)₆]²⁺
is an outer orbital complex.

The reaction of propene with HOCl $(C{l}_2+H_{2}O)$ proceeds through the intermediate:

The maximum bond angle at nitrogen is present in which of the following species?

Van der Waals constant '$b$' of $Ar$ is $3.22\times {10}^{-5}{\text{m}}^3{\text{mol}}^{-1}$. Calculate the molecular diameter (in $nm$) of $Ar$. (Given ${3.4}^3=40$)

Which of the follwing is true in respect of chemical adsorption?

(Here, $\Delta H,\Delta S\text{and}\Delta G$ signifies usual meanings)

Too much of cholesterol present in human blood is one of the reasons for :

The group 18 elements are also known as:

Calculate the pH of a solution prepared by mixing $2.0\text{mL}$ of a strong acid $\left(HCI\right)$ solution of pH $3.0$ and $3.0\text{mL}$ of a strong base $\left(NaOH\right)$ of pH $10.0$. $(Take:lo{g}_{10}34=1.5)$

Among $A{l}_2{O}_3,Si{O}_2,P_2{O}_3,S{O}_2$ the correct order of acid strength is

The species having bond angles of ${120}^o$ is

Calculate the standard enthalpy change for the a cell reaction which has a standard cell potential of $1.50V$. The cell reaction involves the transfer of 2 moles of electrons and standard entropy change is $110J{K}^{-1}$.