The order of decreasing energy among covalent bond (CB), dipole-dipole interaction (DDI) and London dispersion forces (LDF) is:
T50 (half-life period) of first order reaction is 10 min. Starting with 10 mol L-1, rate after 20 min is:
The set representing the correct order of ionic radius is:
Which of the following magnetic moment values will correspond to highest ionization energy form Mn species:
For the reaction
Then relation between k1, k2 and k3 is
Efficiency of Carnot’s engine is 100 % when
Arrange the following compounds in order of Ca—Cb bond length:
All the following are the resonance structure of one another except:
Bombardment of aluminium by α-particle leads to its artificial disintegration in two ways (i) and (ii) as shown. Product X, Y and Z respectively are:
Heat of dissociation of CH3COOH is 0.005 kcal g-1, hence enthalpy change when 1 mole of Ca(OH)2 is completely neutralized by CH3COOH is:
The heat released on neutralization of CsOH with all strong acids is 13.4 kcal mol-1. The heat released on neutralization of CsOH with HF (weak acid) is 16.4 kcal mol-1. ΔH° of ionization of HF in water is:
At low pressure, that Vander Waal’s equation is reduced to:
Correct order of stability of the following carbocation is:
At metaposition, hyperconjugation do not take place.
Inductive effect order −H<−D i.e R−CH3<R−CD3 (Stability)
Hyperconjugation order −H<−D i.e R−CH3>R−CD3 (Stability)
and Hyperconjugated compound is always more stable than inductive effect.
Therefore, Order is I>II>IV>III
The decay modes of 14C and 14O are:
If 3/4 quantity of a radioactive element disintegrates in two hours its half- life would be:
What is the stereochemical relationship between the following compound:
Among the structures given below, the most stable conformation for the following compound is:
Following configuration of the tartaric acid represents:
The gauche conformation (θ = 60°) of n-butane possess:
Rate of formation of SO3 in the following reaction
is 100g min-1. Hence, rate of disappearance of O2 is:
Rate of a reaction is defined as the rate of change of concentration per unit time.
The rate in terms of reactants is given as negative as the concentration of reactants is decreasing with time whereas the rate in terms of products is given as positive as the concentration of products is increasing with time.
Any gas shows maximum deviation from ideal gas at:
The de-Broglie wavelength of the electron in the ground state of hydrogen atom is ? Given: KE = 13.6 eV, 1 eV = 1.6*10 -19J.
For a first order homogenous gaseous reaction, then initial pressure was P, while total pressure after time ‘t’ was Pt. The write expression for the rate constants k in terms of Pi, Pt and t is:
In which of the following reactions, hydrogen peroxide acts as on oxidizing agent:
Heat of neutralization of H2C2O4 (oxalic acid) is - 2 6 kcal mol-1. Hence dissociation energy of:
Which is the correct order of dipole moments of the compounds:
Which carbocation is the most stabilized:
Nodal plane in the π bond is located in:
The correct order of increasing bond angles in the following triatomic species
The schrodinger wave equation for hydrogen atom is:
where ao is Bohr radius. Find position of radial node.
For the reaction: H3PO3 + Ba(OH)2 → BaHPO3 + 2H2O The correct statement(s) is/are
Select incorrect statement(s):
(b) Compressibility factor of an ideal gas is 1.
(c) Real gas behaves like ideal gas at high temperature and low pressure.
Which of the following set(s) of quantum numbers is(are) not allowed:
A radioactive element X emits α-particles followed by 2 p-particles in the successive steps as:
Which of the following statement(s) is/are correct?
Identify which of the structures below are meso structures:
Select the correct statements, out of I, II and III for zeroth order reaction.
(I) Quantity of the product formed, is directly proportional to time.
(II) Larger the initial concentration of the reactant greater the half-life period
(III) If 50% reaction takes place in 100 min, 75% reaction take place in 150 min.
Which is/are correct statements):
The enthalpy of neutralization of which of the following acids and bases is nearly -13.6 kcal:
The following is (are) endothermic reaction:
Hydrogen bonding plays a central role in the following phenomena:
What is the strength (in g/litre) of a solution of H2SO4, 12 mL of which neutralized 15 mL of N/10 NaOH solution:
In an ideal monoatomic gas, the speed of sound is given by . If the speed of sound in argon at 25°C us 1245 km h-1, the root mean square velocity (in ms-1) is...........?
Volume (mL) of H2C2O4. 2H2O solution to prepare 0.10 M from 1.575g of it is ?
The effective nuclear charge of helium atom is 1.7. The first ionization energy of helium atom (in eV) is ....... ?
The standard molar enthalpy of formation of molecular oxygen at 298 K is zero. Thus its value (in KJ/mol) at 315 K is...... ? Given
The amount of heat (in kJ) evolved when 500 cm3 of 0.1 M HCl is mixed with 200 cm3 of 0.2M NaOH is.......?
Find out the double bond equivalent (DBE) value of the given following compound:
A mixture of 50.0 mL o f NH3 and 60.0 mL of O2 gas reacts as
If all the gases are at the same temperature and pressure and the reaction continuous until one of the gases is completely consumed, what volume (in mL) of water vapour is produced.
How many of the following inter halogen species have 2 lone pairs of electrons on the central atom? ClF3, ClF2-, CIF5 ICl2- and XeF2
Chlorine trifluoride has 5 regions of electron density around the central chlorine atom (3 bonds and 2 lone pairs). These are arranged in a trigonal bipyramidal shape with a 175° F(axial)-Cl-F(axial) bond angle.
In a ClF5 molecule, chlorine is the central atom featuring five single bonds with fluorine atoms. Since chlorine has 7 electrons in the valence shell, the remaining two electrons form a lone pair.
For the radioactive isotope 131I, the time required for 50% disintegration is 8 days. The time required for the 99.9% disintegration of 5.5g of 131I is __________ days, (up to one decimal place):
The number of resonance structures for the compound is:
The standard enthalpy of formation of NH3 is -4 6 .0 kJ mol -1. If the enthalpy of formation of H2 from its atoms is —436 kJ mol -1 and that of N2 is -712 kJ mol the average bond enthalpy of N—H bond in NH3 is: (in kJ/mol)
The ΔH° for the reaction at 400 K in kJ mol-1 is ___________________.
Given at 298 K:
One mole of Al4C3(s) reacts with H2O in a closed vessel at 27°C against atmospheric pressure. Work done (in cal) is....?
The total number of compounds which show -M effects:
What will be the longest wavelength line in Balmer’s series of spectrum: (in nm)
The longest wavelength means the lowest energy. We know that relation for wavelength
N2 + 3H2 —> 2NH3. 1 mole N2 and 4 moles H2 are taken in 15 L flask at 27°C. After complete conversion of N2 into NH3, 5L of H2O is added. Pressure set up in the flask is: (in atm)
The potential energy of an electron in the first Bohr orbit in the He+ ion is: (in eV)
At equilibrium, number of atoms disintegrating at two different stages are in the ratio of 1:10. If the half-life of first stage is 15 minutes, half-life second stage would be: (in min)
Among the following, the number of anhydrides of acids are.
CO, NO, B2O3, N2O5, SO3, P4O10, SO2