A to Z Exams

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

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 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

Which one of the following sets correctly represent the increase in the paramagnetic property of the ions

Which of the following brings about dry bleaching

One atom of 3919K contains:

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

The hydrolysis constant Kh of a salt of NaOH and a weak acid (HX) If the Ka of the acid is Ka=2x10-6

When ethyl alcohol reacts with bromine in the presence of alkali the compound formed

For the reaction 2SO2(g)+O2(g)2SO3(g) taking place in one litre vessel, the number of moles of SO2 ,O2,SO3 at equilibrium are 2,1 and 2 moles respectively, under a total pressure of 15 atm.The Kp of the reaction is

Which among the following element does not liberate H2 gas on reaction with NaOH?

In 0.01 M solution,HCN is 0.01% ionized. Its dissociation constant is

Sodium is heated in air at 3000C to form X. X absorbs CO2 and forms Na2CO3 and Y. Which of the following is Y

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 molar conductance of HCl,NaCl and CH3COONa are 426,126 and 91Ω-1cm2mol-1 Respectively. The molar conductance for CH3COOH is

Ordinary glass is a combination of the following

Which of the following is not tetrahedral

What is the time (in sec) required for depositing all the silver present in 125mL of 1 M AgN03 solution by passing a current of 241.25 A ? (1 F = 96500 coulombs)

Which of the following pair of transition metal ions, have the same calculated values of magnetic moment

X,Y,Z hydrocarbons molecular formula are CH4, C2H4, C2H2, these three are passed through porcelain tube containing ammonical cuprous chloride. The out coming gases would be

The molar ionic conductivities of NH4+ and OH- at infinite dilution are 72 and 198 ohm-1cm2mol-1 respectively.The molar conductance of a centinormal NH4OH solution at the same temperature is found to be 9 ohm-1cm2mol-1,The percentage dissociation of NH4OH at this concentration will be

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:

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

Which of the following is a linear molecule

Which of the following is not correct

Which of the following is not a conjugate acid-base pair

SiCl4 on hydrolysis forms X and HCI. Compound X loses water at 1000oC and gives Y. Compounds X and Y respectively are

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

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

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

What is the correct order of occurrence (% by weight) in air of Ne, Ar and Kr ?

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 ?

Which one of the following order is correct for the first ionization energies of the elements

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

Which of the following is not correct regarding the properties of ionic compounds ?

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 of the following is correct

Hydrolysis of trichloro methane with aqueous KOH gives

9.2 gm of N2O4(g) is taken in a closed one litre vesseland heated till the following equilibrium is reached N2O4(g)⇔2NO2(g).At equilibrium 50% of N2O4(g) is dissociated.what is the equilibrium constant(in mole lit-1)(M.wt of N2O4 is 92)

n moles of an ideal gas at temperature T (in kelvin) occupy VL of volume, exerting a pressure of P atmospheres.What is the concentration (in mol / L)?

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

The conjugate acid of NH2- ion is:

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?

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

which of the following is not correcr?

A certain sample of gas has a volume of 0.2 litres measured at 1 atm. pressure and 00 C. At the same pressure but at 273 0c. Its volume will be

Which one of the following functional groups undergoes hydrolysis with alkali to yield an acid group

Aniline is treated with NaNO2 and HCl at 00C,the product formed is:

The following is a reversible reaction

In the long form of periodic table, the elements having lowest ionisation potential are present in :

The maximum number of sub-levels, orbitals and electrons in N shell of an atom are respectively

Number of coulombs of current required to convert completely 1 mole of MnO4-ions in acid medium to one mole of Mn2+ions electrolytically is

At 270C, 500 mL of helium diffuses in 30 minutes. What is the time (in hours) taken for 1000 mL of SO2 to diffuse under same experimental conditions ?

The earthy impurities present in the mineral are called

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

The molar capacity(Cp)of water at constant pressure is 75 J.K-1.mol-1.The increase in temperature (in K) of 100 g of water when 1 K.J. of heat is supplied to it is

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

The number of structural alcoholic isomers for C4H10O 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

The final product formed on the strong heating of H3BO3

While phosphorus form PCl5, nitrogen does not form NCl5 because

The numbers of unit cells present in 5.85mg of NaCl crystal are

The vant Hoff factor for 0.1M Barium nitrate is 2.74. The percentage of dissociation of barium nitrate is

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

The standard reduction potentials of Zn2- | Zn, Cu2+| Cu and Ag+| Cu and Ag+| Ag are respectively -0.76, 0.34 and 0.8 V. The following cells were constructed :1) Zn | Zn 2+||Cu 2+| Cu2) Zn | Zn 2+||Ag +| Ag3) Cu | Cu 2+||Ag +| Agwhat is the correct order of Eocell of these cells?

Which of the following is called Rosenmund reaction?

NH4NO3 on heating to 2500C-2600C gives the gas

The decomposition of H2O2 may be decreased by adding a small quantity of glycerol.This is an example of

Which of the following is an example of interstitial hydride

Ethylene reacts with Br2 in CCl4 to from X. When X is reacted with alcoholic KOH. Y is formed. Here X and Y are

Which of the following is a lyophobic colloidal solution ?

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

A certain current liberated 0.504g of hydrogen in 2hrs. How many grams of copper can be librated by the same current flowing for the same time in a copper sulphate solution

H2-O2 fuel cell is

Which of the following reactions can produce aniline as main product

5 moles of acid is required to change the pH of 1 litre of buffer by 2units.Find buffer capacity.

Assertion (A) : K, Rb and Cs form superoxides.Reason (R) ;     The stability of the superoxides increase from 'K' to 'Cs' dueto decrease in lattice energy. The correct answer is

A codon has a sequence of A and specifies a particular B that is to be incorporated into aC What areA, B, C

For a reversible reaction, if the concentrations of the reactants are doubled, then the equilibrium constant value

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

If the bond length and dipole moment of a diatomic molecule are 1.25 A and 1.0D respectively,what is the percent ionic character of the bond

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

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

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

pH of a buffer solution decreases by 0.02 units when 0.12 g of acetic acid is added to 250 ml of a buffer solution of acetic acid and Potassium acetate at 270C. The buffer capacity of the solution is

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

The heat of formation of HI from the equation H2+I2→2HI,ΔH=+52 KJ is

Atoms of different elements having identical mass are known as :

Solubility product of Ba(OH)2 and Al(OH)3 are 1.8x10-10 and 2.4x10-20 respectively.If both Al3+ and Ba+2 ions are present is a solution,which one will be precipated on addition of Ammonium hydroxide solution

Bauxite is a mineral for the extraction of :

The number of sigma and pi bonds in peroxodisulphuric acid are, respectively

The nature of forces operating between the adsorbate and the adsorbent in the adsorption occurring at high temperature is

If a solid is dispersed in a liquid the colloid is called

Identify 'acetaldoxime'

Which one of the following reactions does not form gaseous product

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

In aqueous solutions H2O2 oxidises H2S to

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

In the extraction of iron from haematite,the charge used is haematite,coke and lime stone in the following weight ratio

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