Major Physical Chemistry - Chemistry MCQ

Which of the following decay with the change in spin multiplicity is known as ISC (Inter System Crossing)?

⁹²U₂₃₈ emits 8α and 6β- particles. The n/p ration in daughter nucleus will be?          

For a cell reaction, consider the following equations:
A + B ⇌ C + D 
2A + 2B ⇌ 2C + 2D 

A complex containing K⁺, Pt(IV) and Cl^- is 100% ionized giving i = 3. Thus, complex is?

The angle between the planes (100) and (110) is:

Adding heat to a solid and liquid in equilibrium will cause the:           

Calculate the lattice energy of KCl at 298 K. Given that:           
Sublimation energy of K(s) = 89 kJ mol^–1           
Ionization energy of K(g) = 418 kJ mol^–1           
Dissociation energy of Cl₂(g) = 244 kJ mol^–1           
Electro attachment energy of Cl(g) = –349 kJ mol^–1           
Formation of KCl(s) = – 437           

In H-atom, electrons make transition from 5^th excited state to ground state producing all possible type of photons. Calculate the number the lines in infrared region.          

The standard emf of the cell, Cd(s) | CdCl₂(aq) (0.1 M) || AgCl(s) | Ag(s) in which the cell reaction, is,  is 0.6915 V at 0°C and 0.6753 V at 25°C. The DH° of the reaction at 25°C is:

For a equilibrium H₂O(s) → H₂O(l)  which of the following statements is true:           

At low pressure if RT = 2(aP)^1/2, then, the volume occupied by a real gas is?

The C-H stretching frequency of an alkane is 2900 cm^-1. Calculate the value of C-D frequency (cm^-1):

Given

(i) Zn + 4NH₃ → Zn(NH₃)₄²⁺ + 2e^–,   E° = 1.03 V
(ii) Zn → Zn²⁺ + 2e^–,              E° = 0.763 V
The formation constant of the complex Zn(NH₃)₄²⁺ is approximately

On the basis of data given below predict which of the following gases shows least adsorption on a definite amount of charcoal?

The calomel electrode and quinhydrone electrode are reversible with respect to which ion  respectively:

At 30°C the solubility of Ag₂CO₃ (K_sp = 8 × 10^–12) would be greatest in one litre of:

For an enzyme catalyzed reaction, the reaction rate is half of its maximum value when

The rate constant, the activation energy and Arrhenius parameter of a chemical reaction at 25^oC are 3×10^-4 s^-1, 104.4 kJ/mol and 6.0×10¹⁴ s^-1 resp.. Calculate the value of rate constant as time →Infinity is?

The degree of dissociation of SO₃ is α at equilibrium pressure P₀.
K_p for 2SO₃(g) → 2SO₂(g) + O₂(g) is 

Aluminum metal has a density of 2.72g/cm³ and crystallizes in lattice with an edge length of 404 pm. Which of the following alternative are correct:           

The conductivity of a saturated solution of BaSO₄ is 3.06 × 10^–6 ohm^–1 cm^–1 and its equivalent conductance is 1.53 ohm^–1 cm² equiv^–1. The K_sp for BaSO₄ will be:

In the following reaction started only with A_g,
2A₈(g) → 2A₃(g) + 3A₂(g) +A₄(g)
mole fraction of A₂ is found to 0.36 at a total pressure of 100 atm at equilibrium. The mole fraction of A₈(g) at equilibrium is:

t_1/2 (half-life period) of 1^st order reaction is 10 min. Starting with 10 mol L^–1, rate after 20 min is:

The phase diagram of CO₂ and Bi differ in the sense that:           

When pure water is saturated with CaCO₃ and CaC₂O₄, the concentration of calcium ion in the solution under equilibrium is 8 × 10^–5 M. If the ratio of the solubility product of CaCO₃ to that of CaC₂O₄ is 3, what is the solubility product of CaCO₃ in pure water?

1g charcoal show chemical adsorption of some acetic acid on coming in contact with 100 mL of 0.50 M acetic acid and the molarity of acetic acid is reduced to 0.49 M. If surface area of charcoal is 3.015 × 10² m²/g, the surface area of each chemical adsorbed molecule of acetic acid is:

Emf of Cd-cell is 1.018 V at 25°C. The temperature coefficient of cell is –5.2 × 10^–5 VK^–1. How cell temperature will change during operation?