An amount of solid NH4HS is placed in a flask already containing ammonia gas at a certain temperature and 0.50 atm. Pressure. Ammonium hydrogen sulphide decomposes to yield NH₃ and H₂S gases in the flask. When the decomposition reaction reaches equilibrium, the total pressure in the flask rises to 0.84 atm. The equilibrium constant for NH₄HS decomposition at this temperature is :

Consider an endothermic reaction, X $$\to$$ Y with the activation energies E_b and E_f for the backward and forward reactions, respectively. In general :

Consider the reaction: N₂ + 3H₂ $$\to$$ 2NH₃ carried out at constant temperature and pressure. If $$\Delta H$$ and $$\Delta U$$ are the enthalpy and internal energy changes for the reaction, which of the following expressions is true?

If the bond dissociation energies of XY, X₂ and Y₂ (all diatomic molecules) are in the ratio of 1:1:0.5 and $$\Delta H_f$$ for the formation of XY is -200 kJ mole^-1. The bond dissociation energy of X₂ will be :

The solubility product of a salt having general formula MX₂, in water is: 4 $$\times$$ 10^-12 . The concentration of M²⁺ ions in the aqueous solution of the salt is :

The exothermic formation of ClF₃ is represented by the equation:
Cl₂ (g) + 3F₂ (g) $$\leftrightharpoons$$ 2ClF₃ (g); $$\Delta H$$ = -329 kJ
Which of the following will increase the quantity of ClF₃ in an equilibrium mixture of Cl₂, F₂ and ClF₃?

For the reaction 2NO₂ (g) $$\leftrightharpoons$$ 2NO (g) + O₂ (g), (K_c = 1.8 $$\times$$ 10^-6 at 184^oC) (R = 0.0831 kJ/(mol. K))
When K_p and K_c are compared at 184^oC , it is found that :

What is the conjugate base of OH^-?

Hydrogen ion concentration in mol / L in a solution of pH = 5.4 will be :

Which one of the following species is diamagnetic in nature?

Due to the presence of an unpaired electron, free radicals are:

Reaction of one molecule of HBr with one molecule of 1,3-butadiene at 40^oC gives predominantly

Of the five isomeric hexanes, the isomer which can give two monochlorinated compounds is

2 methylbutane on reacting with bromine in the presence of sunlight gives mainly

Acid catalyzed hydration of alkenes except ethene leads to the formation of

Which types of isomerism is shown by 2,3-dichlorobutane?

Which types of isomerism is shown by 2,3-dichlorobutane?

Benzene and toluene form nearly ideal solutions. At 20 ^oC, the vapour pressure of benzene is 75 torr and that of toluene is 22 torr. The partial vapour pressure of benzene at 20 ^oC for a solution containing 78 g of benzene and 46 g of toluene in torr is

Equimolar solutions in the same solvent have

Amongst the following the most basic compound is

Amongst the following the most basic compound is

Which one of the following methods is neither meant for the synthesis nor for separation of amines?

An organic compound having molecular mass 60 is found to contain C = 20%, H = 6.67% and N = 46.67% while rest is oxygen. On heating it gives NH₃ along with a solid residue. The solid residue give violet colour with alkaline copper sulphate solution. The compound is

In both DNA and RNA, heterocyclic base and phosphate ester linkages are at-

The decreasing order of nucleophilicity among the nucleophiles

The reaction



is fastest when $$X$$ is

A schematic plot of $$ln$$ $${K_{eq}}$$ versus inverse of temperature for a reaction is shown below


The reaction must be

$$p$$-cresol reacts with chloroform in alkaline medium to give the compound A which adds hydrogen cyanide to form, the compound $$B.$$ The latter on acidic hydrolysis gives chiral carboxylic acid. The structure of the carboxylic acid is :

The oxidation state of chromium in the final product formed the reaction between $$K{\rm I}$$ and acidified potassium dichromate solution is :

On heating mixture of $$C{u_2}O$$ and $$C{u_2}S$$ will give :

Calomel $$\left( {H{g_2}C{l_2}} \right)$$ on reaction with ammonium hydroxide gives :

Pick out the isoelectronic structure from the following :

$$\eqalign{ & \left( i \right)\,\,\,\,\,\,C{H_3}^ + \cr & \left( {ii} \right)\,\,\,\,{H_3}{O^ + } \cr & \left( {iii} \right)\,\,\,N{H_3} \cr & \left( {iv} \right)\,\,\,\,C{H_3}^ - \cr} $$

For a spontaneous reaction the ∆G , equilibrium constant (K) and $$E_{cell}^o$$ will be respectively

Aluminium oxide may be electrolysed at 1000^oC to furnish aluminium metal (Atomic mass = 27 amu; 1 Faraday = 96,500 Coulombs). The cathode reaction is Al³⁺ + 3e^- $$\to$$ Al^o To prepare 5.12 kg of aluminium metal by this method would require

The highest electrical conductivity of the following aqueous solutions is of :

Calculate $$ \wedge _{HOAc}^\infty $$ Using appropriate molar conductances of the electrolytes listed above at infinite dilution in H₂O at 25^oC

Hydrogen bomb is based on the principle of

A reaction involving two different reactants can never be

The photon of hard gamma radiation knocks a proton out of $${}_{12}^{24}Mg$$ nucleus to form

t_1/4 can be taken as the time taken for the concentration of a reactant to drop to $$3 \over 4$$ of its initial value. If the rate constant for a first order reaction is K, the t_1/4 can be written as

The lanthanide contraction is responsible for the fact that :

Which of the following factors may be regarded as the main cause of lanthanide contraction?

The IUPAC name of the coordination compound K₃[Fe(CN)₆] is

The oxidation state of Cr in [Cr(NH₃)₄Cl₂]⁺ is :

The value of the ‘spin only’ magnetic moment for one of the following configurations is 2.84 BM. The correct one is :

Which one of the following cyano complexes would exhibit the lowest value of paramagnetic behaviour?
(At. No. Cr = 24, Mn = 25, Fe = 26, Co = 27)

Tertiary alkyl halides are practically inert to substitution by S_N2 mechanism because of

Elimination of bromine from 2-bromobutane results in the formation of-

Elimination of bromine from 2-bromobutane results in the formation of-

Alkyl halides react with dialkyl copper reagents to give

The best reagent to convert pent -3- en-2-ol into pent -3-en-2-one is

Among the following acids which has the lowest pK_a value?

Two solutions of a substance (non electrolyte) are mixed in the following manner. 480 ml of 1.5 M first solution + 520 ml of 1.2 M second solution. What is the molarity of the final mixture?

If we consider that 1/6, in place of 1/12, mass of carbon atom is taken to be the relative atomic mass unit, the mass of one mole of the substance will

Of the following sets which one does NOT contain isoelectronic species?

In a multi-electron atom, which of the following orbitals described by the three quantum members will have the same energy in the absence of magnetic and electric fields?
(A) n = 1, l = 0, m = 0
(B) n = 2, l = 0, m = 0
(C) n = 2, l = 1, m = 1
(D) n = 3, l = 2, m = 1
(E) n = 3, l = 2, m = 0

Which of the following oxides is amphoteric in character?

In which of the following arrangements the order is NOT according to the property indicated against it?

Lattice energy of an ionic compounds depends upon