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the letters of the word attention are formed by taking all letters at a time. the probability that neither two t's nor two n's are together is

the addition of propene with HOCl proceedes via the addition of cl+ in the first step how?

Sulphurous acid (H2SO3) has Ka1=1.7×10−2 and Ka2=6.4×10−8. The pH of 0.588 MH2SO3 is ______ (Round off to the Nearest Integer).

The relative stability of +1 oxidation state of group 13 element follows the order :

Monosubstituted product 'P' would be:

which one of the following pairs of chemical species contains the ions having same hybridisation of the central atom?A)NO2- AND NH2-2)NO2- AND NO3-3)NH4+ AND NO3-4)SCN- AND NH2-

CH3-CH(CH3)-CH2-CH3 +Cl2 hv -> Major (A) in the reaction is1.Cl-CH2-CH(CH3)-CH2-CH32. CH3-CH(CH3)-CH-Cl-CH33. CH3-CH(CH3)-CH2-CH2-Cl4. CH3-C(CH3)Cl-CH2-CH3

5.6 liter of helium gas at STP is adiabatically compressed to 0.7 liter. Taking the initial temperature to be T1, the work done in the process is

Vant hoff factor for 30 % dissociation of K4 [ Fe ( CN6) ] is

The hybridisation of boron and oxygen atom in boric acid H3BO3 are respectively:

The pair(s) of ions where BOTH the ions are precipitated upon passing H2S gas in presence of dilute HCl is/are:

How many phosphodiesters bond are present in 5’ATTTTTGG 3’ sequence of nucleotides(A)7

9. What is alternando

Meaning of NADPH2

In the Inverse spinel compound, Fe O4, thepercentage of the tetrahedral voids occupied isequal to(1)12.5%(2)50%(3) 74%(4)68%

Explain the types of dyes based on their method of application.

2Zn+O2 ---2ZnO. △ G =-616J 2Zn +S2 ---- S2 -----2ZnS.△ G=-293J S2 +2O2 ----2SO2 △ G-408J △ G for the following reaction 2ZnS + 3 O2 ---- 2ZnO+SO2 is

If C1,C2,C3.........represent the speeds of n1,n2,n3......... molecules, then the root mean square speed is _____.

How to find hybridization of a structure what are the procedure

Ejection of a photoelectron from a metal in the photoelectric effect experiment can be stopped by applying 0.5 V when a radiation of 250 nm is used. The work function of the metal is :

Battery acid is 4.22 M aqueous solution h2so4 solution and has density of 1.21 g cm-3 . What is molality of h2so4?

Total number of isomers, considering both structural and stereoisomers, of cyclic ethers with the molecular formula C4H8O is .

Why is alkene a better nucleophile than alkyne or more reactive towards electrophilic addition than alkyne?

An ideal solution was obtained by mixing methanoland ethanol. If the partial vapour pressure of9.methanol and ethanol are 2.619 kPa and 4.556kPa respectively, the composition of vapour (interms of mole fraction) will be

Consider the reactions:(aq) + I2(s) → (aq) + 2I–(aq)aq) + 2Br2(l) + 5 H2O(l) → (aq) + 4Br–(aq) + 10H+(aq)Why does the same reductant, thiosulphate react differently with iodine and bromine?

What does the term 'zwitterionic amino acid' mean ?

What is the potential energy of the electron in the L-shell of the hydrogen atom?

Therate constant for a first order reaction is 60 s−1.How much time will it take to reduce the initial concentration of thereactant to its 1/16thvalue?

what is the relation between a inorganic or organic solution with the aqueous medium

34.Which of the following have same hybridisation? NO2- and NH2- No2- and NO3- NH4+and NO3- SCN- and NH2-

The de-Broglie wavelength of an electron in 4th orbit of radius r is:

Why temperature is considered both as state function and state variable?

One mole of an ideal gas at an initial temperatureof T K does 6R joules of work adiabatically. If theratio of specific heats of this gas at constantpressure and at constant volume is 5/3, the finaltemperature of gas will be(2) (T- 2.4) K(4) (T-4)K(3) (T + 4) K

Select the correct relation regarding the ionic radii of given ions:

7. Molality of 8M aqueous solution of ethanol having density 1.38g/ml is

How find weak filled or strong filled ligand

Identify the correct order of boiling points of the following compounds.(1) CH3CH2CH2CH2OH (2) CH3CH2CH2CHO(3) CH3CH2CH2COOH

10^-4 M AgNO3 is mixed with 4 solution given in the options successively. Arrange the salt in the order of their precipitate.1)10^-3 M KI(Ksp=10^-6)2)10^-3 M CuCl(Ksp=10^-10)3)10^-4 M ZnBr2(Ksp=10^-8)4)10^-2 M AlCl3(Ksp=10^-12)

Choose the the correct order of −I effect shown by the following groups.

1÷7=?

Why is oxygen represented as [O] in oxidation reaction in chemical properties of alkenes in hydrocarbons?

on increasing temperature why henry constant increase

Which compound would give 5-keto-2-methyl hexanal upon ozonolysis ?

When H2S gas is passed through a hot acidic aqueous solution containing Cr3+, Cd2+, Hg2+ and Co2+, a precipitate is formed which does not consist of :

4. A specimen of NH3 at the presence of Fe heated given N2 &H2 if total pressure is 866mmofHg find out the partial pressure of N2 1)433mmHg 2)288.7mmHg 3)649.5mmHg 4)216.5mmHg

In a compound, nitrogen atoms (N) make cubic close packed lattic and metal atoms (M) occupy one-third of the tetrahedral voids present. Determine the formula of the compound formed by M and N ?

Which of the following is the best acceptor of proton ?

The Seebeck emf (in mV) for a material with α=50μV/oC. If the junction temperatures are 20oC and 100oC is4

A reaction is carried out on 400K . if the effective collisions is 0.0001% of total number of collision then find the activation energy?

For a given reaction, ΔH=35.5 kJ mol−1 and ΔS=83.6J K−1mol−1. The reaction is spontaneous at (Assume that ΔH and ΔS do not vary with temperature.)