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In acid medium, both KMnO_(4) " and " K_(2)Cr_(2)O_(7) act as oxidising agents. Which among the following is correct about the oxidising behaviou ?

In acetylene molecule between the carbon atoms there are ……………. sigma and ………………….. pi bonds.

In acetylene molecule between the carbon atoms there are

In above problem -26, why the IUPAC name 4-isopropyl-5-secondary butyldecane is wrong?

In ABAB.... Arrangement if an atom is placed in A layer then calculate the number of atoms touching in its adjacent B layer ?

In a Victor Meyer's determination, the following observations have been made: Mass of compound = 0.17g Volume of air collected = 34.2 mL Temperature = 15^(@)C Atmospheric pressure = 750 mm Vapour pressure of water at 15^(@)C = 13mm Calculate the vapour density and molecular mass of the compound.

In a Victor Meyer's determination of molecular mass, 0.1015 g of an organic substance displaced 27.96 mL of air at 15°C and 766 mm pressure. Calculate the molecular mass of the substance (Aqueous tension at 15°C = 16 mm).

In a Victor Meyer's determination of molecular mass, 0.15 g of a volatile substance displaced 31.64 mL of air at 25°C and 755 mm pressure. Calculate the molecular mass of the substance.

In a Victor Meyer's determination, 0.23 g of a volatile substance displaced air which measured 112 mL at S.T.P. Calculate the vapour density and molecular weight of the substance (1 litre of H_2 at S.T.P. weighs 0.09 g).

The uncertainty in the position of an electron moving with a velocity of 1x10^4ms^-1 (accurate up to 0.011%) will be

In a titration to 5OmL of 0.2M acetic acid (K_(a), = 1.8 xx10^(-5) ), 0.2M of V' mlL of NaOH is added to get a resultant solution of pH=4.74 if V =x^(2)?, what is x?

In a tetragonal crystal

In a solution the concentration of CaCl_(2) is 5M & that of MgCl_(2) is 5 m. The specific gravity of solution is 1.05, calculate the concentration of Cl^(-) in the solution in terms of Molarity.

In a solid S^(2-) ions are packed in fcc lattice. Zn^(2+) occupy half of the tetrahedral voids in an alternating arrangement. Now if a plane is cut (as shown) then the cross -section would be

In a solid, oxide ions are arranged in ccp. One -sixth of the tetrahedral voids are occupied by the cations A while one -third of the octahdral voids are occupied by the cations B. what is the formula of the compound ?

In a solidlattice, the cation has left a lattice site and is located on interstitial position. The lattice defect is

In a solid, oxide ions are arranged in ccp. One-sixth of the tetrahedral voids are occupied by the cations A while one-third of the octahedral voids are occupied by the cations B. What is the formula of the compound?

In a solid lattice, the cation has left a lattice site and is located at an interstitial position. The lattice defect is

In a solid lattice, cation is absent from lattice site and present at an interstitial posiotion, the lattice defect is

In a solid 'AB'havingNaCl structure , 'A' atoms occupy the corners of the cubic unit cell. If all the face-centred atoms along one of the axes are removed, then the resultant stoichiometry of the solid is

In a solid 'AB' having NaCl structure atoms occupy the corners of the cube unit cell. If all the face centred atoms along one of the axis are removed then the resultant stoichiometryof the solid is

In a solid 'AB' having NaCl structure , 'A' atoms occupy the corners of the cubic unit cell. If cell the face-centred atoms along one of the axes are removed , then the resultant stoichiometry of the solid is

In a solid .AB. hasving the NaCl structure, .A. atoms occupy the corners of the cubic unit cell. If the face - centrad atoms along one of the axis are removed, then the resultant stoichiometry of ther solid is

In a sodium atom(atomic number=11 and mass number=23) and the number of neutrons…………..

In a S_(N)2 substitution reaction of the type R-Br+Cl^(-) overset(DMF)to R-Cl+Br^(-), which of the following has the highest reactivity rate?

In a simple cubic cell, each point on a corner is shared by

In a set of reactions acetic acid yielded a product S CH_(3)COOH overset(SOCl_(2))rarrP underset("Anhy." AlCl_(3))overset("Benzene")rarr Q overset(HCN)rarrR overset(H_(2)O //H^(+))rarrS The structure of S would be :

In a series in the line spectrum of hydrogen, the wavelength of radiation is 6,563Å. The name of the series and the orbits in which electron transition takes place are

In a series in the line spectrum of hydrogen the wavelength of radiation is 6,563Å. The name of the series and the orbits in which electron transition takes place are

In NaCl is doped with 1 xx 10^(-3) mol percent of SrCl_(2) , what is the concentration of cation vacancies ?

In a saturated solution of AgCl, NaCl is added gradually. The concentration of Ag^(+)is plotted against the concentration of Cl^(-). The graph appears as :

In a saturated aqueous solution of AgBr , conc, of Ag^(+) ion is 10^(-6) mol/lit. if K_(sp) for Ag Br is 1 xx 10^(-12) , then concentration of Br^(-) in the solution is

In a sample of sodium carbonate, some sodium sulphate is mixed. 2.50 g of this sample is dissolved and the volume made up to 500 mL . 25 mL of this solution neutralises 20 mL of N//10 in the sample.

In a sample of excited hydrogen atoms electrons make transition from n = 2 to n = 1. Emitted photons striķe on a metal of work function (phi) 4.2 eV. Calcualte the wavelength (in A^@) associated with ejected electrons having maximum kinetic energy.

In a reversible reaction, two substances are in equilibrium . If the concentration of each one is doubed , the equilibrium constant will be.

In a reversible reaction, the forward reaction was 3 times faster than that of reverse reaction. The reaction quotient is.....

In a reversible reaction the rate constants of the forward and the backward reactions are 4.8xx10^(-5)s^(-1)and1.2xx10^(-4)s^(-1) respectively. Calculate the equilibrium constant.

In a reversible reaction K_(c) gt K_(p) and DeltaH = + 40 K. Cal. The product will be obtained in less amount on

In a reversible reaction, if the concentration of reactants are double, the equilibrium constant K will be x times the initial equilibrium constant. x will be equal to

In a reversible reaction at equilibrium the net heat change of the reaction is :

In a reversible process, the change in entropy of the universe is_______

In a reversible process, the change in entropy of the universe is

In a reversible process, the change in entropy of the universe is ____

In a regular B_(12) icosahedran : (a) How many boron atoms are equidistant from a given boron atom ? (b) How many edges are there ? ( c) How many valence electrons are there ? (d) Can each edge line represent pair bond ? ( e) Explain the type of bonding involved in elemental boron ?

In a Regnault's experiment, the mass of a definite volume of a gas was found to be 4.6420 g, whereas the mass of the same volume of hydrogen at the same temperature and pressure was found to be 0.2902 g. Calculate the vapour density and molecular mass of the gas.

In a reaction involving ring substitution of C_(6)H_(5)Y, the major product is meta isomer. The group Y can be