A to Z Exams

In a 500ml flask,the degree of dissociation of PCl5 at equilibrium is 40% and the initial amount in 5 moles.The value of equilibrium constant in mol lit-1 for the decomposition of PCl5 is

1.5 g of CdCl2 was found to contain 0.9 g of Cd. Calculate the Atomic weight of Cd

The reagent used in the preparation of aspirin from salicylic acid is

148mg of Ca(OH)2 is required to remove hardness of one lit. of hard water by Clarke’s process. If hardness is due to only calcium bicarbonate, what is the degree of hardness of sample of water?

The compound prepared by a substitution reaction of benzene is

A molecule (X ) has (i) four sigma bonds formed by the overlap of sp2 and s orbitals (ii) one sigma bond formed by sp2 and sp2 orbitals and (iii) one π bond formed by px and pz orbitals. Which of the following is X ?

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

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

One mole of alkene X on ozonolysis gave one mole of acetaldehyde and one mole of acetone. The IUPAC name of X is

Hydrolysis of chloroform with aqueous KOH gives finally

How many 'ml' of perhydrol is required to produce sufficient oxygen which can be used to completely convert 2 lit of SO2 gas to SO3 gas

During the electrolysis of cyrolite,aluminium and fluorine are formed in.......molar ratio

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

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

Identify the correct decreasing order of the following with respect to altitude from atmosphere:I. Troposphere    II. Mesosphere  III. Thermosphere

The olefin which on ozonolysis gives CH3CH2CHO and CH3CHO is

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.......

A radioactive substance 88X228 (IIA) emits 3α and 3β particles to form "Y". To which group of long form of the periodic table does "Y" belong

When a sample of gas expands from 4.0L to 12.0L against a constant pressure of 0.30 atm, the work involved is (1L ATM=101.35 J)

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

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

The solubility of AgCl in NaCl solution is less than that in pure water,because

In the hardening stage of plaster of paris, the compound formed is :

The charge present onn one azide ion in columbs is

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

Which of the following reacts with ammoniacal cuprous chloride

The number of pπ - dπ 'pi' bonds present in XeO3and XeO4molecules, respectively are

Which of the following is not an air pollutant

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

In dry cell cathode is

CH2=CH2+HCl→CH3CH2Cl is an example for

Which of the following is not correct

Let electronegativity, ionisation energy and electron affinity be represented as EN, IP and EA respectively. Which one of the following equation is correct according to Mulliken?

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

Hydrolysis of sucrose with dilute aqueous sulphuric acid yields

......of a reaction cannot be determined experimentally:

A 0.2 molal aqueous solution of a weak acid (HX) is 20 percent ionized. The freezing point of this solution is (Given Kf = 1.860C kg mol-1 for water)

What is the quantity of electricity (in Coulombs) required to deposit all the silverfrom 250 mL of 1 M AgNO3 solution

8 gram of NaOH is mixed with 9.8 gram of H2SO4 in litre of solution the pH of the solution is

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

Which of the following is not correct

Which of the following does not participate in carbylamine reaction?

x grams of water is mixed in 69 g of ethanol. Mole fraction of ethanol in the resultant solution is 0.6. What is the value of x in grams ?

Calorific value of producer gas is low because of

One atom of 3919K contains:

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

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

The number of moles of electrons required to deposit 36 g of Al from an aqueous solution of Al(NO3)3 is (At. wt. of Al = 27)

90 grams of water and 230 grams of an organic liquid n mixing gives a solution in which the mole fraction of water in the resulting solution is 0.5 the molecular weight of the organic liquid is

The final product formed on the strong heating of H3BO3

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

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

Assertion (A): The PH of a buffer solution containing equal moles of acetic acid and sodium acetate is 4.8  (pKa of acetic acid is 4.8)Reason (R): The ionic product of water at  250C is l0-14 mol2 .L-2. The correct answer is

9.2 grams of N2O4(g) is taken one liter vessel and heated till the following equilibrium is reached N2O4 (g)⇔2NO2(g).At equilibrium 50% of N2O4(g) is dissociated.The value of Kc is

Which one of the following reactions does not form gaseous product

5.85 gms of NaCl (Mol. wt. 58.5) is dissolved in water and the solution made up to 500ml; the molarity of the solution will be

Assertion (A): the molecularity of reaction is a whole number other than zero , but generally less than 3 Reactions (R): the order of a reaction is always whole number

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

The decomposition of N2O5 → NO2+NO3 proceeds as a first order reaction, with a half-life period of 30 seconds at a certain temperature.The rate constant of the reaction is

Which of the following contains a coordinate covalent bond ?

Calculate the emf of the cell   Cu (s) | Cu2+ (aq) || Ag+ (aq) | Ag (s)  GivenEoCu2+/Cu  = +0.34V ,  EoAg+/Ag  =0.80 V

On passing a current through a KCl solution, 19 5 g. of potassium is deposited. If the same quantity of electricity is passed through a solution of aluminium chloride, the amount of aluminium deposited is:

Ultrapure elements are obtained in the following method of metal refining

Which of the following is a linear molecule

The earthy impurities present in the mineral are called

Which of the following, compounds is the reactant in Rosenmund's reduction

9.8 g of H2SO4is present in two litres of a solution.The molarity of the solution is:

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

Method used for the concentration of tinstone ore 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

Study the following table: Buffer solution Volume(in ml) of 0.M weak Volume(in ml) of 0.1 M sodium salt of weak acid I 4.0 4.0 II 4.0 40.0 III 40.0 4.0 IV 0.1 10.0 Which of the two sets of buffer solutions have least pH?

Observe the following reaction2A + B → CThe rate of C is 2.2 x 10-3 mol L-1 min-1.What is the value of - d[A]/dt (in mol. L-1min-1)

Molar conductivity of a solution 1.26 x 102Ω-1cm2mol-1 ,its molarity is 0.01.its specific conductivity will be

0.84 g of metal carbonate reacts exactly with 40 mL of N/2 H2S04. The equivalent weight of the metal carbonate is :

The electrolytic conductance of 0.01 M solution of acetic acid is 0.000163 Scm-1 at 298k. The % of dissociation of acetic acid at 298K.Given Am0 of acetic acid =390.7 Scm-2/mole at 298K.

Which of the following is a lyophobic colloidal solution ?

Which of the following is not correct

Which of the following pair of ions have same paramagnetic moment

In aqueous solutions H2O2 oxidises H2S to

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

For the reaction H2(g)+I2(g)⇔2HI(g) at 721 K,the value of equilibrium constant KC is 50.The value of KP under the same conditions will be

Ethyl chloride reacts with sodium ethoxide to form a compound A. Which of the following reactions also yields A ?

The experimental data for the reaction 2NO(g)+Cl2(g)→2NOCl(g) are given below Expt [Cl2] [NO] Initial rate 1 0.020 0.010 2.4x10-4 2 0.020 0.030 2.16x10-3 3 0.040 0.030 4.32x10-3 What is the order of the reaction

A gaseous mixture contains 56g of N2,44g of CO2 and 16g of CH4.The total pressure of th mixture is 720 mm Hg.The partial pressure of CH4 is:

when acetaldehyde is heated with Fehling solution, a red precipitate is formed. Which of the following is that

The rate equation for the reaction A+2B→products is rate=K[A][B]2. If the volume of the vessel is decreased to half of the initial volume the reaction rate bears the following relation to the original rate

Which pair of oxyacids of phosphorous contain ‘P - H' bonds

Which of the following is added to chloroform to slow down its aerial oxidation in presence of light ?

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

Which of the following functional group shows +R effect

The number of sigma and pi (π) bonds present in benzene respectively are :

The heat of neutralization of strong acid and weak base is

The weight in grams of a non-volatile solute (M.wt:60) to be dissolved in 90 g of water to produce a relative lowering of vapour pressure of 0.02 is

In which of the following reactions the product is an ether

The molecular formula of potash alum is :

Absolute alcohol (100% alcohol) is prepared by distilling rectified spirit over:

Nitro benzene on reduction with zinc and NH4CI gives

Assertion (A) : NaCl is less soluble in heavy water than in ordinary water,Reason (R) : Dielectric constant of ordinary water is more than that of heavy waterThe correct answer is

Zn(s)+Cu+2(ag)→Cu(s)+Zn+2(ag)Given that ΔfG0 for Cu+2(ag) and Zn+2(ag) are +65.0 K.J.mol-1 and -147.2 K.J.mol-1 respectively then the standard Gibbs energy change for the above reaction is