A to Z Exams

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

The vant Hoff factor for 0.1M Barium nitrate is 2.74. The percentage of dissociation of barium nitrate 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 heat of formation of HI from the equation H2+I2→2HI,ΔH=+52 KJ is

In the extraction of copper, the slag formed in the blast furnace

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 halide does not contain a lone pair of electrons on the central atom

The type of bonds present in sulphuric anhydride

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

The IUPAC name for CH3-CH2-CH(OH)-CH=CH2

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)

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

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

For a given reaction which one is higher than the rest among the following

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 ?

Which of the following has the highest first IP

which of the following is not correcr?

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

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 one of the following salts give an acidic solution in water

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

H2-O2 fuel cell is

The following is a reversible reaction

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

Which of the following is not a peroxy acid

The IUPAC name of an unsymmetrical ether with the molecular formula C4H10O:

Which of the following reacts with benzene in presence of anhydrous aluminum chloride and forms acetophenone ?

In nuclear reactor, heavy water is used as a :

Which of the following reactions can produce aniline as main product

Hydrolysis of trichloro methane with aqueous KOH gives

The conjugate base of HSO4- ion is:

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

The transition temp.at which rhombic sulphur becomes monoclinic sulphur 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

Which of the following is used for making optical instruments ?

Bond energy of Cl2,Br2 and I2 follow the order

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

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?

At 270C the ratio of root mean square velocities of ozone to oxygen is :

The molecule having zero dipole moment is:

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

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

A and B are ideal gases. The molecular weights of A and B are in the ratio of 1 : 4. The pressure of a gas mixture containing equal weights of A and B is P atm. What is the partial pressure (in atm) of B in the mixture ?

The oxidation states of nitrogen in NH4NO3 is /are

Which of the following is not an air pollutant

The ΔG in the process of melting of ice at -150C and 1atm pressure 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

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

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

Observe the following statements :I.    The physical and chemical properties of elements are periodic functions of their electronic configuration.II.    Electronegativity of fluorine is less than the electronegativity of chlorine.III.   Electropositive nature decreases from top to bottom in a group.The correct answer 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

Calorific value of producer gas is low because of

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

In aqueous solutions H2O2 oxidises H2S to

Order of boiling points

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

The solubility of the impurities in the metal in molten and solid states is different. The principle involved in the refining of metal is

x grams of calcium carbonate was completely burnt in air. The weight of the solid residue formed is 28g. What is the value of x (in grams)

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

A sample of water contains 11.1 ppm of CaCl2 and 9.5 ppm of MGCl2 the hardness of water sample is

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

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

The decreasing order of bond dissociation  energies of   C-C , C-H and H-H i bond is

Which one of the following compounds liberates CO2 from aqueous NaHCO3

Which of the following statements is not correct ?

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

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

Which of the following is not correct

Ordinary glass is a combination of the following

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

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

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

Vicinal dihalide (C2H4Br2) on heating with excess alc.KOH and Zinc dust gives ’y’ and ‘z’ respectively. Both ‘y’ and ’z’ on oxidation with Bayer’s regent gives A and B.A and B respectively 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

A metal nitride contains 28% nitrogen by weight. The molecular formula of metal nitride is M3N2 What is the atomic weight of metal

Dry distillation of calcium acetate and calcium formate forms:

Which of the following is correct ?

The charge present onn one azide ion in columbs 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

Which one of the following elements reduces NaOH to Na?

In which of the following reactions, the concentration of reactant is equal to concentration of product at equilibrium(K=equilibrium constant)

In the reaction AlCl3+Cl-→[AlCl4]-,AlCl3 acts as

The chemical entities present in thermosphere of the atmosphere

Which one of the following equations represents the variation of viscosity coefficient (η) with temperature (T) ?

The metal used for the de-bromination reaction of 1, 2 dibromoethane

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)

The average kinetic energy of one molecule of an ideal gas 270C and 1 atm. pressure is

138 g of ethyl alcohol is mixed with 72 g of water. The ratio of mole fraction of alcohol to water is

In the reaction AlCl3+Cl-→AlCl4-, AlCl3 is

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

When the same amount of zinc is treated with excess of H2SO4 and with excess NaOH, the ratio of the volume of H2 evolved is

The amount of electricity that can deposit 108gm of silver from AgNO3 solution is

The value of Kp for the reaction 2H2S(g)⇔2H2(g)+S2(g) is 1.2 x 10-2 at 10650C.The value of KC for the reaction is

Which of the following reacts with ammoniacal cuprous chloride

In Freundlich adsorption isotherm, the intercept is equal to

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

In a first order reaction,50 minutes time is taken for the completion of 93.75% of a reaction. Half life of the reaction is

Which one of the following statements is correct

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.