A to Z Exams

The equilibrium constant for the reactionSO2(g) + (1/2) O2(g) <====> SO3(g) is  5 x 10-2 atm  The equilibrium constant of the reaction2SO3(g)  <====> 2SO2(g) + O2(g) would be

Which of the following reacts with ammoniacal cuprous chloride

Aluminium reacts with NaOH and forms compound X. If the coordination number of aluminium in X is 6, the correct formula of X

Which of the following is not correct

A complex compound of CO3+ with molecular formula COClx. yNH3 gives a total of 3 ions when dissolved in water. How many Cl- ions satisfy both primary and secondary valencies in this complex

"Fluorosis" disease is caused due to the reaction of ________ with excess of fluoride in the body

Consider the two gaseous equilibria involving SO2 and the corresponding equilibrium constants at 298K SO2(g)+1/2O2(g)⇔SO3(g);K1 2SO3(g)⇔2SO2(g)+O2(g);K2 The values of the equilibrium constants are related by

Which of the following alkali metals has the greatest tendency for the half reaction;  M(g) →M+(aq) + e

One mole of N2H4 loses 10 moles of electrons to form a new compound Z.Assuming that all the nitrogens appear in the new compound, what is the oxidation state of nitrogen in Z? (There is no change in the oxidation state of hydrogen)

The first organic compound synthesized in the laboratory from an inorganic compound is:

Which one of the following reactions does not form gaseous product

The Kc for the reaction A+B↔C is 4 and Kc for 2A+D↔C is 6. The value of Kc for C+D↔2B is

A quantity of PCl5(g) was heated in a 10 litre vessel at 2500C PCl5(g) ⇔PCl3(g)+Cl2(g) At equilibrium the vessel contains 0.1 mole of PCl5 0.2 mole of PCl3 and 0.2 mole of Cl2 .The equilibrium constant is

The value of Kp for the reaction 2AB(g)⇔2A(g)+B2(g) is 1.2x10-2 at 1065oC.The value of Kc for this reaction is

Dry distillation of calcium acetate and calcium formate forms:

The r.m.s. velocity of an ideal gas at 300 K is 12240 cm/sec. What is the most probable velocity at that temperature?

Which one of the following compounds in aqueous solution gives a white precipitate with perichloric acid ?

consider the following reaction equilibrium N2(g)+3H2(g)⇔2NH3(g).Initially 1 mole of N2 and 3 moles of H2 are taken in a 2 litre flask.At equilibrium state if the number of moles of N2 is 0.6 what is the total number moles of all gases present in the flask at equilibrium

A sample of gas has a volume of 0.2 lit. measured at 1 atm. pressure and 00C. At the same pressure, but at 2730C its volume will become

Liquid benzene burns in oxygen according to 2C6H6(l)+15O2 (g)→12CO2 (g)+6H2O(l) .How many litres of oxygen are required for complete combustion of 39 gms.Of liquid C6H6

In photoelectric effect, if the energy required to overcome the attractive forces on the electron,(work functions) of Li, Na and Rb are 2.41eV, 2.30eV and 2.09eV respectively, the work function of ‘K’ could approximately be in eV

The order of decrease in atomic radii for Be;Na;Mg is

The following are some statements related to VA group hydrides,I . Reducing  property increases from NH3 to BiH3.II..Tendency to donate lone pair decreases from NH3 to BiH3III.Thermal stability of hydrides decreases from NH3 to BiH3.IV. Bond angle of hydrides decreases from NH3 to BiH3.The correct statements are

∆x is given by ∆x=(Hydrogen energy-Lattice energy). For a salt ∆x is found to be 500 kcal mol-1.Then on increasing the temperature, its solubility in water

Average C-H bond energy is 416 kJ. mol-1. Which of the following is correct ?

Ethylene reacted with bromine in CCl4 to form X. When X is reacted with alcoholic KOH, Y is formed. X and Y are respectively :

What is the correct order of spin only magnetic moment (in BM) of Mn2+, Cr2+ and V2+ ?

The heat of formation (ΔHf) of H2O(g) is -243 KJ.ΔE of it at temperature T is

Which one of the following noble gases is used in miner's cap lamps

A mixture of sodium oxide and calcium oxide are dissolved in water,and saturated with excess carbon dioxide gas.The resulting solution is.....It contains.......

The equilibrium constant Kp for the reaction 2SO2+O2⇔2SO3 is 2.5 atm-1.What would be the partial pressure of O2 at equilibrium. If the equilibrium partial pressures of SO2 and SO3 are equal

In the extraction of sodium by Down's process, cathode and anode are respectively:

Conjugate base of H2SO4 is

In the reaction BCl3+PH3→[Cl3B←PH3] the lewis base is

When X amperes of current is passed through molten AlCl3 for 96.5 second,0.09g of alumunium is deposited.What is the value of X

Three faradays of electricity are passed through molten Al2O3, aqueous solution of CuSO4 and molten NaCl taken in three different electrolytic cells. The amount of Al,Cu and Na deposited at the cathodes will be in the ratio of

When compound X is oxidised by acidified potassium dichromate, compound Y is formed. Compound Y on reduction with LiAlH4 gives X. X and Y respectively are :

If H++OH-→H2O.ΔH=-57.3 KJ, then the heat of neutralization for complete neutralization of 1 mole H2SO4 by a base is

'Natalite' is used as

CH3COOH ----LiAlH4--->  AA + CH3COOH ---H3O+ ----->  B + H2OIn the above reactions 'A' and 'B' respectively are

Ordinary glass is a combination of the following

Two oxides of nitrogen,NO and NO2 react together at 2530K and form a compound of nitrogen X.X reacts with water to yield another compound of nitrogen Y.The shape of the anion of Y molecule is

CaCl2+C2H5OH→CaCl2xC2H5OH,in this ‘x’ is

PH of a solution produced when aqueous solution of PH 6 is mixed with an equal volume of an aqueous solution oh PH is about

When a copper wire is dipped in a aqueous AgNO3 solution, the solution turns blue,The reason for this is

The energy of a photon is 3 x 10-12 ergs.What is its wavelength in nm ?( h = 6.62 x 10 -27ergs-s ; c = 3 x 10 10 cm/s )

Which one of the following equation is correct for the reaction N2(g)+3H2(g)→2NH3(g)

Which one of the following statements is correct

Observe the following statements :I.   Bleaching   powder   is   used   in   the preparation of chloroform.II.  Bleaching powder decomposes in the presence ofCoCl2 to liberate 02.III.Aqueous KHF2 is used in the preparation of fluorine.The correct combination is :

Which of the following is a favourable factor for cation formation

The molecular formula of potash alum is :

On passing a current through molten KCl 19.5 of K is deposited. The amount of aluminium deposited by the same quantity of electricity if passed through molten AlCl3 is

If the length of the unit cell is 5 Ao. the smallest distance in Ao between the two neighbouring metal atoms in a face centred cubic lattice is

The addition of HCl will not suppress the ionization of

Alcohol manufactured from water gas is

Identify 'acetaldoxime'

Which of the following compounds answer positively carbyl amine test? A) C6H5NHCH3 B) CH3-C6H6-NH2 C) C6H6-NH2 D) C6H6-NH (CH3)2

Hybridization at 2nd carbon in CH2 = CH – CH3 is

Bhopal gas tragedy of 1984 was caused by

The disperse phase, dispersion medium and nature of colloidal solution (lyophilic or lyophobic) of 'gold sol' respectively are :

Assertion(A): The molecularityof reaction is a whole number other than zero, but generally less than 3. Reason(R): The order of a reaction is always a whole number

The equilibrium constant for the reaction is 6.The initial concentration of each of CH3COOH and C2H2OH is two(mole/lit).What is the concentration of CH3COOC2H5 at equilibrium in moles /lit

The chemical formula of 'tear gas is :

The equilibrium constants for the reactions N2(g)+O2(g)⇔2NO(g) and NO(g)+1/2O2(g)⇔NO2(g) are K1 and K2 respectively. Then the equilibrium constant for the reaction N2(g)+2O2(g)⇔2NO2(g) is

Identify the correct order in which the covalent radius of the following elements increasesI. TiII. CaIII. Sc

Which of the following reagents can form a hydrazone with alkanone

Consider the following reaction N2 (g)+3H2 (g)⇔2NH3 (g).Initially ,1 mole of N2 and 3 moles of H2 are taken in a 2 litre flask.At equilibrium state if the number of moles of N2 is 0.6 what is the total number moles of all gases present in the flask at equilibrium

Aniline when heated with NaNO2 and HCl at 0.50C the product formed is:

Which of the following has S---S bond ?

Which of the following is a lyophobic colloidal solution ?

Which of the following not obtained when methyl chloride and n-propyl chloride react with sodium in dry ether

For the reaction A(g)⇔B(g)+C(g),Kp at 4000C is 1.5x10-4 and Kp at 6000C is 6x10-3 Then the incorrect statement is

A mixture contains 10 g of oxygen, 28g of nitrogen and 8g of CH4.Total pressure of mixture is 740mm.What is the partial pressure of nitrogen in mm

Which of the following is not a peroxy acid

CCl3COCH3+Ca(OH)2→X+Y. Here X and Y are

If a gas contains only three molecules that move with velocities of 100,200,500 ms-1.What is the rms velocity of that gas in ms-1

The charge present onn one azide ion in columbs is

In aqueous solutions H2O2 oxidises H2S to

What is the temperature at which the kinetic energy of 0.3 moles of Helium is equal to the kinetic energy of 0.4 moles of Argon at 400 K ?

The number of π bonds in the product formed by passing acetylene through dil.H2SO4 containing mercuric sulphate is:

The standard reduction electrode potential values of the elements A, B and C are +0.68V, -2.5V and -0.5V respectively. The order of their reducing power is

All the three oxygen atoms of ozone are utilized in the oxidation of

The order of pH of 0.200 M solutions of NH4NO3, NaNO3 and Na2CO3 is

The rate of gaseous reaction is give by k[A][B].If the volume of reaction vessel is reduced to 1/4 of initial volume the reaction rate relative to the original rate is

When aniline is treated with CHCI3 and KOH, the product is :

Assertion (A) : A catalyst increases the rate of a reaction.Reason (R) : In presence of a catalyst, the activation energy of the reaction increases. The correct answer is

Which of the following statements is correct

How many electrons are present in the M shell of an atom of an clement with atomicnumber 24 (Z = 24) ?

The   IUPAC    name    of   the    compound(CH3)2CH-CH=CH-CHOH-CH3 is

A catalyst increases the rate of reaction because it :

At 270C the Kp value for the reaction PCl5(g)⇔PCl3(g)+Cl2(g).is 0.65.Its Kc is

Which one of the following compounds forms a quaternary salt on reacting with excess methyl iodide ?

The chemicals and the reaction conditions required for the preparation of ethane are

X liter of carbon monoxide is present at STP. It is completely oxidized to CO2. The volume of CO2 formed is 11.207 litres. What is the value of X in litres

For the reversible reaction C2H4 + H2 ⇔ C2H6 the equilibrium constant can be expressed in units of

The oxidation state of Mo in MO2 (Cl8)4- ion is

Resonance in benzene is accompanied by delocalization of π –electrons. Each π electron is attached with

 Fluorine reacts with dilute NaOH and forms a gaseous product A. The bond angle in the molecule of A is

On passing a current through molten KCl 19.5g of K is deposited.The amount of aluminium deposited by the same quantity of electricity if passed through molten AlCl3 is

Calculate the hydrolysis constant of a salt of a weak acid(Ka=2x10-6) and of a weak base(Kb=5x10-7)