Which of the following molecules will have the highest zero point vibrational energy:
Which one of the normal modes of ethylene is active in the infrared:
The moment of inertia for HCl gas can be determined from its microwave spectrum, which property of the HCl molecule may be obtained from the moment of inertia:
Overtones are observed in the vibrational spectra of diatomic molecules when:
The correct order of the fundamental vibrational frequency of the following diatomic molecules is:
The reaction of the bromo compound shown below with sodium ethoxide gives predominantly
The reaction of l-bromo-2-fluorobenzene with furan in the presence of one equivalent to Mg gives:
Correct absolute configuration is
The microwave spectrum of a molecule yields three rotational constants. The molecule is:
Electronegativity and Electron affinity of an element A are X and Y resp. Hence Ionisation potential is
Which of the following is the most stable conformer of the following molecule:
Correct Answer :- B
Explanation : When the methyl group in the structure above occupies an axial position it suffers steric crowding by the two axial hydrogens located on the same side of the ring. The conformation in which the methyl group is equatorial is more stable, and thus the equilibrium lies in this direction.
Therefore,the equatorial bonds are the most stable in chair form.
The increasing order of basicity among the following is :
The major product P is:
The major product expected from the following reaction is?
The population (N) distribution over states (n) of a diatomic molecular corresponds to:
Arrange the following in increasing order of Ka value:
Correct energy profile for amine inversion and hybridization of nitrogen in transition state is:
Resonance frequencies for EPR and NMR are respectively in the spectral region:
Compound A and B exist in
Consider the cell Cd(s)/Cd+2(1.0M)// C+2(1.0M)/Cu(s). if we wanted to make a cell with a more positive voltage using the same substances, we should:
The major product P is:
EMF of the following cell is 0.67 V at 298 K. Pt|H2(latm) |H+(pH = X) || KCl (IN) | Hg2Cl2(s) | Hg Calculate the pH of anode compartment. Given
Rate of formation of SO3 in the following reaction
is 100g min-1. Hence, rate of disappearance of O2 is:
In the following sequence of pericyclic reactions X and Y are
Specifi heat of N2 at constant pressure is 0.25 cal/g°C. Hence specific heat at constant volume is
Bridge-head hydrogen of the conform of cis-decalin is positioned as:
The resonance energy of anthracene (from the below data)
Given which of the following statement is incorrect:
Weight of 14C have radioactivity 1 Curie (Disintegration constant is 4.4 × 10–12 sec-1 is ‘(in Kg)
In the reaction, P + Q → R + S the time taken for 75% reaction of P is twice the time taken for 50% reaction of P. The concentration of Q varies with reaction time as shown in the figure. The overall order of the reaction is:
Consider the following reaction involving two acids shown below: formic acid and HF.
Which of the following statements about this reaction is/are true?
Which statement is correct in respect of the below reaction:
Which of the following statement is/are correct:
(I) The conductance of one cm3 (or 1 unit3) of a solution is called specific conductance
(II) Specific conductance increases while molar conductively decreases on progressive dilution
(III) The limiting equivalent conductivity of weak electrolyte cannot be determine exactly by extrapolation of the plot of ∧eq against
(IV) The conductance of metals is due to the movement of free electrons
In electrolyte concentration cell:
(I) The electrode material and the solution in both half –cells are composed of the same substances
(II) Only the concentrations of solutions of the same substances is different
(III) E0cell = 0
(IV) The Nernst equation reduces to
Which of the following statement is correct:
Dimer formation can take place in
Which of the following complex species is expected to show optical isomerism-
Boric acid is dissolved in D2O. Hence, which of the following is/are true
Mg and Zn do not resemble in following properties
Which of the following compound is/ are chiral:
Which among the following is/are acid:
If is 1.69 V & is 1.40 V, then will be(in Volt):
Consider the following nuclear reactions:
The number of neutrons in the element L is:
The two fine-structure components of a nuclear magnetic resonance transition are observed at chemical shifts of 2.142 and 2.208 ppm in a 300 MHz NMR spectrometer. Calculate the coupling constant (in Hz):
What is the oxidation state of ‘W’ in (Me3CO)3W(CCMe3) ?
B2H6 is added with excess of RCl. Number of the possible products among following:
B2H1R5 ,B2H2R4, B2H3R3 , B2H5R1, B2R6, B2H4R2
Number of molecules among the following, having pЛ-dЛ bonding is/are
P4O10, N2O5, (SiH3)3N, SO3.
How many P-O-P bond are there in H27P25O76 andH25P25O75 resp:
Half life of 53I125 is 60 days. What percentage of radioactivity would be present after 180 days ?
What would be the atomic weight of isotope of Hydrogen which contains 2 neutrons in nucleus.
For the fuel cell reaction
What is ΔS0298 (kJ/K) for the given fuel cell reaction?
Rotational property of a body is characterized by its moment of inertia. Consider ABCD is square box of side 4m. Find moment of inertia (in Kg/m2) along Z-axis:
Ionisation energy of He+ is 19.6 × 10–18 Jatom-1.The energy of first stationary state of Li+2 is…(in J atom-1 , in the multiple of 10–17):
At 570 C gaseous dinitrogentetraoxide is 50% dissociated. Calculate standard free energy change (J/mol) of it at this temp and 1atm initial pressure of gas:
Equal volume of two monoatomic gases A and B are mixed at same temp. and pressure. The ratio of specific heats Cp:Cvof mixture will be …?
For the reaction X2O4(l) giving 2XO2(g) , ∆U = 2.1 kcal, ∆S= 20 cal/K at 300K. Calculate ∆G(in kcal):
A sample of rock from moon contains equal number of atoms of Uranium and Lead (t1/2 for
U = 4.5× 109 years. What is age (years) of rock (in the multiple of 109)?
Consider the following reaction,
The reaction is first order in each direction, with an equilibrium constant of 104. For the conversion of chair form to boat form e–Ea/RT = 4.35 × 10–8 at 298 K with pre-exponential factor of 1012 s–1, Apparent rate constant (=kA + kB) at 298 K is(S–1, in the multiple of 108):
Following is the graph between (a – x)–1 and time t for a second order reaction,
Hence, rate at the start of the reaction is (in mol L–1 min–1 ).
The number of neutrons emitted when 92U235 undergoes controlled nuclear fission to 54Xe142 and 38Sr90.
The J = 0 to J = 1 rotational transition for 1H79Br occurs at 500.72 GHz. Assuming the molecule to be a rigid rotor, the J = 3 to J = 4 transition occurs at …….(in cm–1)