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The solubility product of a salt having general formula $M{X}_2,$ in water is $4\times {10}^{-12}$. The concentration $\left(mol{L}^{-1}\right)$ of $M^{2+}$ ions in the aqueous solution of the salt is:

For the reaction, $H_2+I_2\rightleftharpoons 2HI,K=47.6$. If the initial number of moles of each reactant and product is 1 mole then at equilibrium

What do you mean by
activity and selectivity of catalysts?

Which is true about Boyle's Law?

The molar conductivities of $NaOAc$ and $HCl$ at infinite dilution in water at ${25}^{\circ }C$ are $91.0$ and $426.2Sc{m}^{2}mo{l}^{-1}$ respectively. To calculate the limiting molar conductivity of $HOAc$ at same temperature, the additional value required is:

Give the decreasing order of reactivity of the following alkyl halides in the Williamson’s reaction.

$i.{\left(C{H}_3\right)}_{3}C-C{H}_{2}Br$

$ii.ClC{H}_{2}CH=C{H}_2$

$iii.ClC{H}_{2}C{H}_{2}C{H}_3$

$iv.BrC{H}_{2}C{H}_{2}C{H}_3$

Low spin complex of $d^6$ cation in an octahedral field will have the following energy

A vessel having a volume of $5$ litres contains $1.4\text{g}$ of nitrogen at a temperature of $1800\text{K}$. The pressure of the gas if $30\%$ of its molecules are dissociated into atoms at this temperature is:

Question 3

Metal hydrides are ionic, covalent or molecular in nature. Among LiH,NaH, KH,RbH,CsH, the correct order of increasing ionic charcter is

(a) LiH > NaH > CsH > KH > RbH

(b) LiH < NaH < KH < RbH < CsH

(c) RbH > CsH > NaH > KH > LiH

(d) NaH > CsH > RbH > LiH > KH

A reversible reaction proceeds in the direction that decreases the free energy of the system. There is an important relationship between the equilibrium constant and the standard free energy of the system given by

$\text{log K}=\frac{-\Delta G^0}{2.303}\text{RT}$

This equation is applicable to all reversible processes and allows us to estimate the equilibrium constant from the standard free energy and the enthalpy change of the reaction.

Take $R=\frac{25}{3}\text{J/molK,}\frac{1}{12}\text{L atm/molk,}\ln 2=0.7,\ln 3=1.1,\ln 5=1.6,\text{log}2=0.3,\text{log 3}=0.5,log5=0.7$



The equilibrium constant for the dissociation of $N_2{O}_4$ into $N{O}_2$ is 0.125 at ${27}^{\circ }$C. What is the standard free energy change for this reaction?

Which of the following is the strongest acid? ($p{K}_a$ values given at ${25}^{o}C$)

इस पाठ में आए अलिफ़लैला, अलहदीन, अबुल हसन और बगदाद के खलीफा के बारे में सूचना एकत्रित कर कक्षा में चर्चा कीजिए।

Which of the following will show schottky defect

Which of the following relations are correct?

Suppose a gas mixture of F,Cl, Br ,I is irradiated with photons of frequency appropiate to ionize Cl . What ions will be present in the mixture ?

Equal Volumes of three acid solutions of pH 3, 4 and 5 are mixed in a vessel. What will be the $H^{\oplus }$ concentration in the mixture?

Polypropylene can be obtained by polymerisation of:

The solubility of $CuBr$ is $2\times {10}^{-4}$ $mol{L}^{-1}$. at ${25}^{o}C.$ The $K_{sp}$ value for $CuBr$ is:

Chlorine is in +1 oxidation state in

The number of $\sigma$ and $\pi$ bonds present in Inorganic benzene

In Dumas method of estimation of nitrogen, $0.35\text{g}$ of an organic compound gave $55\text{mL}$ of nitrogen collected at $300\text{K}$ temperature and $715\text{mm}$ pressure. Find the percentage composition of nitrogen in the compound. $(\text{Aqueous tension at}300\text{K}=15\text{mm Hg})$

What is the role of cryolite in the metallurgy of aluminimum?

The correct order of the increasing ionic character is :

How much volume is occupied by spheres of a face centered cubic unit cell?

Which one of the following statements is FALSE:

The kinetic energy of 5.6 litres of oxygen at STP in cals is

An alkene 'A' on ozonolysis yield only ethanal. The chain isomer of 'A' on ozonolysis yields-

Give
equations of the following reactions:

(i)
Oxidation of propan-1-ol with alkaline KMnO₄
solution.

(ii)
Bromine in CS₂
with phenol.

(iii)
Dilute HNO₃
with phenol.

(iv)
Treating phenol with chloroform in presence of aqueous NaOH.