IIT JAM Chemistry - MCQ Test 3

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:

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 K_a 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) E⁰_cell = 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:

B₂H₁R_{5 ,}B₂H₂R_4, B₂H₃R_{3 ,} B₂H₅R_1, 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 C_p:C_vof 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 (=k_A + k_B) 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)