A to Z Exams

The charge required to reduce 1 mole Cr2O7-2 to Cr+3 ions is

Atoms of different elements having identical mass are known as :

Which of the following pair of ions have same paramagnetic moment

The ratio of radii of first orbits of H, He+ and Li+2 i

List-I List-II List-III CH3COONa Alc.KOH Ethylene CHCl2-CHCl2 H2O Acetylene C2H5MgI NaOH+CaO Methane CH3-CH2Cl Zn dust Ethane The correct match is

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

In lime kiln the reaction CaCO3(s)⇔CaO(s)+CO2(g)

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 )

The solubility of LiOH in a solution of pH = 8 = is Ksp = 1.8 x 10-12

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

Aqueous solution of an organic compound, 'A' on electrolysis liberates acetylene and CO2 at anode. 'A' is

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

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

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

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

Which of the following reagents and conditions convert benzene to chlorobenzene

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

Helium mixed with oxygen is used in the treatment of:

 Which of the following is a pair of functional isomers

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

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

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

The total pressure of a mixture of 6A of O2 and 5.6 g of N2 present in a 2 litre vessel is 1200 mm. What is the partial pressure (in mm) of nitrogen?

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

The heat of neutralization of strong acid and weak base is

What is the hybridization state of the central atom in the conjugate acid of NH3?

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

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

Nitro benzene on reduction with zinc and NH4CI gives

75% of first order reaction is completed in 32 minutes 50% of the reaction would have been completed in

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

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?

Which of the following reacts with ammoniacal cuprous chloride

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 ?

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.......

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

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)

Hydrolysis of trichloro methane with aqueous KOH gives

Which of the following is called Rosenmund reaction?

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

The type of bonds present in sulphuric anhydride

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 gold numbers of three protective colloids A, B, and C are 0.05, 0.01 and 0.5 respectively. The decreasing order of their protective power is:

Which of the following is not tetrahedral

A solution of concentration "C" g equiv/litre has a specific resistance R, The equivalent conductance of the solution is

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

Oxide of nitrogen which gives reddish brown colour when exposed to air is

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

Which of the following does not participate in carbylamine reaction?

Which of the following elements has least number of electrons in its M shell ?

Which of the following statements is correct

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

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

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?

The transition temp.at which rhombic sulphur becomes monoclinic sulphur is

The wavelength of a spectral line emitted by hydrogen atom in the Lyman series is (16/15)hr cm  .What is the value of n2   (R= Rydberg Constant)

'Natalite' is used as

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

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

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

HCl+H2O?H3O++Cl- A Conjugate base of HCl is Cl- B Conjugate base of H3O+ is H2O C Conjugateacid base pair is HCl and H3O+ D Conjugateacid base pair is Cl- and H2O

If in a 100 mL of an aqueous HC1 of pH 1.00, 900 mL of more distilled water is added, the pH of the resultant solution will be :

A moving electron has 4.55 x 10-25 joules of kinetic energy. The wavelength of the electron is (mass = 9.1 x 10-31 kg and h = 6.6 x 10-34 kg m2 sec-1)

Which one of the following is a secondary alcohol ?

Which of the following brings about dry bleaching

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

A mixture of Boran trichloride and hydrogen is subjected to silent electric discharge to form ’A’ and HCl. ’A’ is mixed with NH3 and heated to 2000 C to form B. The formula of B 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

The method of separation of enantiomers from racemic mixture is known as

The gold numbers of three protective colloids A, B, and C are 0.05, 0.01 and 0.5 respectively. The decreasing order of their protective power is

The flux used in the extraction of iron from Haematite in the blast furnace is

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

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

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

Which of the following functional group shows +R effect

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

The cell reaction of a cell is Mg(g)+Cu2+(aq)→Cu(g)+Mg2+(aq).If the standard reduction potentials of magnesium and copper are -0.33 and +2.38V respectively,the e.m.f of the cell is:

Which of the following has the highest first IP

The wavelengths of electron waves in two orbits is 3 : 5. The ratio of kinetic energy of electrons will be

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

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

Which of the following compounds is soluble in benzene but almost insoluble in water

Bauxite is a mineral for the extraction of :

Which of the following is not correct

H2-O2 fuel cell is

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

Which of the following is used for making optical instruments ?

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

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

Hydrolysis of sucrose with dilute aqueous sulphuric acid yields

What is the volume (in litres) of oxygen required at STP to completely convert 1.5 mol of sulpher into sulpher dioxide

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

How many litres of oxygen (at STP) are required for complete combustion of 39 g of liquid benzene?(Atomic weights: C = 12, O = 16, H = 1)

Which of the following is not correct

The chemical formula of 'tear gas is :

Which of the following compounds when heated with CO at 150"C and 500 atm pressure in presence of BF3 forms ethyl propionate ?

The hydronium ion concentration of a solution is 1X10-4 M at 250 C.The hydroxide ion concentration in the same solution is

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

Which one of the following reactions does not form gaseous product