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in a period from Li to F, ionisation potential

In a period, elements are arranged strictly in sequence of

In a particular reduction process, the concentration of a solution that is initially 0.24 M is reduced to 0.12 M in 10 hours and 0.06 M in 20 hours. What is the rate constant of this reaction ?

In a particular experiment , 272 g of phosphorus, P_(4) , reacted withexcess ofoxygen of form P_(4)O in89 . 5 %yield. In the secondstep of thereaction, a 97.8%yield of H_(3) PO_(4) was obtained. Whatmassof H_(3) PO_(4) was obtained ?

In a particular case of bacterial growth following second order kinetics, concentraion of bacteria increases to 4 times initial concentration of 1 M in 24 minutes. What will be the generation time of the bacterial growth, if initial concentration is 2 M.

In a P -type semiconductor, germanium is doped with

In a particular isomer of [Co(NH_(3))_(4)Cl_(2)]^(0), the Cl-Co-Cl angle is 90^(@), the isomer is known as

In a octahedral geometry the type of hybridisation involved is………….

In a nuleophilic substitution reaction : R-Br + Cl^(-) overset(DMF)(to) R-Cl+ Br^(-) ,which one of the followingundergoes complete inversion of configuration ?

In a nucleotide the phosphate linkage is generally attached to

In a nucleoside, a base is attached at 1' position of sugar moiety. Nucleotide is formed by linking of phosphoric acid unit to the sugar unit of nucleoside. At which position of sugar unit is the phosphoric acid linked in a nucleoside to give a nucleotide ?

In a nuclear reactor, the function of moderator is

In a nitrating mixture (conc. HNO_(3)+ conc. H_(2)SO_(4)) nitric acid acts as

In a Ni-Cd battery ( more than one correct )

In a nuclear reactor, chain reaction is controlled by introducing

In a neutron induced reaction of ""_(93)^(235)U, one of the products is ""_(37)^(95)Rb. In this process anther nucleide and three neutrons are also produced. The other nucleide is :

In a multi -electron atom, which of the following orbitals described by three quantum numbers will have the same energy in the absence of magnetic field ? (i) n = 1, I =0, m =0(ii) n = 2, I = 0 , m = 0 (iii) n = 1, I = 1, m =1(iv) n = 3, I = 2, m = 1 (v) n = 3, I=2, m = 0

In a multistep reaction, the overall rate of reaction is

In a multistep reaction, the fastest step is the rate determining step.

In a monochlorination experiment, some of the monochloro products obtained have been mentioned (a to j) Find the total number of alkane reactants which can give these products

In a monoclinic unit cell :

In a mono - keto compound , generally which from of tautomeric structure is more stable than other ?

In a mixture of weak acid and its salt, the ratio of concentration of acid to salt is increased ten-fold. The pH of the solution

In a mixture, two enantiomers are found to be present in 85% and 15% respectively. The enatiomeric excess (e,e) is

In a mixture of sample of H-atoms and He ions, electrons in all the H-atoms and He^+ ions are present in n = 4^"th" state. Then, find maximum number of different spectral lines obtained when all the electrons make transition from n=4 upto ground state

In a mixture of PbS, ZnS and FeS_2 each component is separated from other by using the reagents in the following sequence in froth floatation process.

In a mixture of iso - octane and n-heptane, the percentage of n-heptane is 10. The octane number of the fuel is:

In a mixture of CH_3COOH and CH_3COONa the ratio of salt to acid concentration is increased by ten folds Thr ph of the solution will increase by :

In a mixture of A and B, components show -ve deviations when

In a mixture of 1 gm H_(2) and 8 gm O_(2), the mole fraction of hydrogen is

In a mixture having nitrite and nitrate, nitrite can be destroyed by heating with

In a mixture having nitrite and nitrate , nitrate , nitrite can be destroyed by heating with H_2 SO_4 and

In a mixing of acetic acid and sodium acetate the ratio of concentration of the salts to the acid is increased ten times. Then the pH of the solution

In a metallurgical process ,an acid flux is used for removing…..

In a metal oxide, there is 20% oxygen by weight. Its equivalent weight is

In a metal oxide, oxide ions are arranged in hep array and the metal ion occupies octa­hedral holes. If one third of octahedral voids and all tetrahedral voids are empty the metal oxide formula is (M- metal)

In a metal M having bcc arrangement edge length of the unit cell is 400 pm . The atomic radius of the metal is

In a measurement of surface tension by the falling-drop method, 5 drops of a liquid of density 0.797 g/mL weighed 0.220 g. Calculate the surface tension of the liquid.

In a lime kiln, to get higher yield of CO_(2), the measure that can be taken is

In a lead storage battery

In a Lassaigne's test for sulphur in the organic compound with sodium nitroprusside solution the violet colour formed is due to :

In a II order reaction when the concentration of both the reactants are equal. The reaction is completed 20% in 500 sec. How long (in seconds) it would take for the reactions to go to 60% completion?

In a metal oxide, oxide ions are arranged in hep array and the metal ion occupies octahedral holes. If one third of octahedral voids and all tetrahedral voids are empty the metal oxide formula is (M- metal)