A to Z Exams

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

An organic compound containing C and H has 92.3% of carbon, Its empirical formula is:

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

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

The olefin which on ozonolysis gives CH3CH2CHO and CH3CHO is

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 salt of phosphorous acid are called

Identify the reaction for which ΔH ≠ ΔE :

Three faradays of electricity was passed through an aqueous solution of iron(II) bromide.The weight of iron metal(at.wt=56) deposited at the cathode is(in grams):

The correct trends in the hydrides from Bi to N is

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

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

The half-life period of a radioactive element is 120 days. After 480 days 4.0 gm of the element will be reduced to (.....) gms.

The charge present onn one azide ion in columbs is

Which of the following reacts with ammoniacal cuprous chloride

Anhydrous Magnesium chloride can be prepared by heating MgCl2.2H2O

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 ?

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

The degree of dissociation of an acid HA in 0.1 M solution is 0.1%. 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

Increasing the conc. of the reactant by 27 times, the rate increases by 3 times. What is the order of the reaction?

Calorific value of producer gas is low because of

When aniline is treated with CHCI3 and KOH, the product 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

The addition of HCl will not suppress the ionization of

The chemical formula of feldspar is

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

Given the bond energies of N = N, H — H and N—H bonds as 945, 436 and 391 kj/mol respectively, the enthalpy    of    the    reaction N2(S) + 3H2 (g) —> 2NH3(g) is :

Active mass of 56 g of N2 contained in 2 ltr.Flask 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

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

A certain mass of a gas occupies a volume of 2 L at STP. To what temperature the gas must be heated to double its volume, keeping the pressure constant

The pH of a solution of H2O2 is 6.0, Some chlorine gas is bubbled into this solution. Which of the following is correct

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

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 which of the following cases, the reaction is spontaneous at all temperatures

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

Which of the following reacts with ethanol to form chloroform

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

Which of the following is not an air pollutant

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)

Among  the following, which is water insoluble

Which of the following reagents and conditions convert benzene to chlorobenzene

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.

A sample of 100ml water required 0.294mg of K2Cr2O7(mol.wt=294)for oxidizing dissolved organic compounds in it. The C.O.D of water sample is

A cylinder of gas contains 14.5 kg of butane. If a family needs 2.5x104 KJ of energy per day for cooking. Hoe long will the cylinder last. (Enthalpy of combustion of butane=2600 KJ/mole)

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

Which of the following is an endothermic reaction ?

Which one of the following salts give an acidic solution in water

Electrons with a kinetic energy of 6.023 x 104 J/mol are evolved from a surface of a metal, when it is exposed to radiation of wavelength of 600 nm, The minimum amount of energy required to remove an electron from the metal atom is

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 :

The compound prepared by a substitution reaction of benzene is

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

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

Which of the following contains a coordinate covalent bond ?

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

Which of the following has the highest first IP

When 9.65 Coulombs of electricity is passed through a solution of AgN03 (atomic weight of silver 108), the amount of silver deposited 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

In aqueous solutions H2O2 oxidises H2S to

CH2=CH2+HCl→CH3CH2Cl is an example for

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

Which of the following is a linear molecule

Which of the following reactions can produce aniline as main product

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

3-hydroxybutanal is formed when (X) reacts with (Y) in dilute (Z) solution. Whatare X, Y and Z

The half-life period of a radioactive substance is 150 days. Starting with an initial quantity of 1 mg of the substance the fraction of that has disintegrated in 600 days is

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

Dipole moment of HC1 = 1.03 D, HI = 0.38 D. Bond length of HC1 = 1.3 and HI = 1.6A .The ratio of fraction of an electric charge, δ, existing on each atom in HC1 and HI is

For the estimation of sulphur by Carius method, the organic compound is heated in Carius tube with

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

Assertion(A): A catalyst has no effect on the state of equilibrium Reason:A catalyst influences the rates of both forward and backward reactions to the same extent

One mole of fluorine is reacted with two moles of hot concentrated KOH. The products formed are KF, H2O and O2. The molar ratio of KF, H2O and O2 respectively is

Which of the following brings about dry bleaching

Which of the following pair of ions have same paramagnetic moment

An oxide of an element is a gas and dissolves in water to give an acidic solution. The element belongs to

Which of the following reagents when heated with ethyl chloride, forms ethylene ?

The formula of the product formed, when sodium thiosulphate solution is added to silver bromide is

The bonds in K4Fe(CN)6 are:

What is the molecular formula of the product formed when benzene is reacted with ethyl chloride in presence of anhydrous aluminum chloride ?

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:

The molecule having zero dipole moment is:

Hybridisation of oxygen in diethyl ether is

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

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

The rate constant of a reaction increased by 3 times for every 100C rise of temperature uniformly in the range 200C to 800C, if the rate of constant at 300C is K, what is its value at 600C

The element that can exhibit highest number of oxidation states amongst the following:

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 heat of formation of SO2(g) is -297.8 kJ mol-1.The enthalpy change in the decomposition of 1 mole SO2(g) to its constituent elements is

While phosphorus form PCl5, nitrogen does not form NCl5 because

The earthy impurities present in the mineral are called

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

An organic compound X on treatment with pyridinium chloro chromate in dichloromethane gives compound 'Y". Compound Y reacts with I2 and alkali to form triiodomethane. The compound 'X' is

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

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

Given that ∆Hf(H) = 218 k J / mol, express the H - H bond energy in k cal/mol

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

For the redox reaction Cr2O72+ + C2O42+ + H+ → Cr3+ + CO2 + H2O the correct coefficients of Cr2O72-, C2O42- and H+ in the balanced equation are

Which of the following is not correct

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