LMS

Consider the following reaction2Cr₂O₇^2- (aq) + 16H+(aq) + 3C₂H₅OH(aq) → 4Cr₃+(aq) + 11H₂O(l) + 3CH₃COOH(aq)Which atom undergoes decrease in oxidation number

An enthalpy change which is always exothermic

During following conversions, the central atom in the product will have lower oxidation state than that of in reactant.

Hydrogen gas is not liberated when the following metal is added to dil. HCl

The standard electrode potential is measured by ______

Aluminium displaces hydrogen from dilute HCl whereas silver does not. The E.M.F. of a cell prepared by combining Al/Al⁺³ and Ag/Ag⁺ is 2.46 V. The reduction potential of silver electrode is + 0.80 V. The E°red of aluminium electrode is

The enthalpy change in a cyclic process is

Solutions containing chlorate (I) ions are used as household bleaches and disinfectants. These solutions decompose on heating as shown 3ClO^– →ClO₃–+ 2Cl^–Which oxidation state is shown by chlorine in each of these three ions

Which of the following factors accounts for degree of dissociation of an electrolyte

Which gas will be evolved at cathode during electrolysis of aq. CuCl₂ solution

Enthalpy of neutralization of all the strong acids and strong bases has the same value because

In endothermic reactions, the heat contents of the

Work may be defined in terms of pressure-volume as

The condition for standard enthalpy change is

If electricity is passed through CuSO₄ solution by using Pt electrode, then which of the following possible change occurs

Stronger the oxidizing agent greater is the

In an electrolytic cell current flows

Eored of an element can be calculated by comparing it with

Which of the following molecule show only translational motion

Which of the following value of standard reduction potential suggest that the reducing power of an element is approximately equal to oxidizing power

The study of heat changes accompanied by a chemical reaction is called as

The enthalpy of atomization of H₂(g) [½ H₂(g) H(g)] is 218 kJ/mol, the enthalpy of formation of H₂(g) from gaseous atom is

The net heat change in a chemical reaction is same whether it is brought in two or more different ways in one or several steps. It is known as

Which of the following is correct relationship at constant pressure

Which of the following is correct representation for calculation of lattice energy

The charges are balanced in above equation by adding

When KMnO₄ acts as an oxidizing agent and ultimately forms MnO₄^2-, MnO₂, Mn₂O₃ and Mn²⁺, then the number of electrons transferred in each case is

In an operating electrochemical cell the function of a salt bridge is to

Among the following molecules, in which does bromine show the lowest oxidation number

In the reaction 4Fe + 3O₂ → 4Fe³⁺+ 6O₂– . Which of the following statements is incorrect

Standard reduction electrode potentials of three metals P, Q and R are +0.5 V, -3.0 V and -1.2 V respectively. The order of reducing power of these metals is

The system becomes more stable if it

According to first law of thermodynamics energy from system to surrounding can be transferred in the form of

The sum of all the energies of atoms, molecules or ions within a system is called

Evaporation of water is __________ change

The expression D E = q + w is

The heat contents of all the elements in their standard states are taken to be

One calorie is equal to

In a reaction, the oxidation number of Cr decreases by 3. This indicates that Cr is

When a Zn piece is placed in CuSO₄ solution, copper gets precipitated because

Which of the following change in enthalpy in Born-Haber cycle may be negative

During balancing of Redox equations by oxidation number method the ‘O’ and H-atoms are balanced by

Which of the following is incorrect about enthalpy of neutralization?

Standard enthalpy of Al2O₃ cannot be measured because

The dissolution of ammonium chloride in water is a/an

The ‘x’ electrons in above equation are

For an endothermic reaction the value of DH is denoted by

Which is used to measure enthalpy of combustion

For a given process, the heat change at constant pressure (qp) and constant volume (qv) are related to each other as

The amount of heat required to convert one mole of a solid directly into its vapour state at STP is called as