21.

Li occupies a higher position in the electrochemical series of metals as compared to Cu since :

• the standard reduction potential of Li⁺/Li is lower than that of Cu²⁺/Cu

• the standard reduction potential of Cu²⁺/Cu is lower than that of Li⁺/Li

• the standard oxidation potential of Li⁺/Li is lower than that of Cu²⁺/Cu

• Li is smaller in size as compared to Cu

58.4 g of NaCl and 180 g of glucose were separately dissolved in l000mL of water. Identify the correct statement regarding the elevation of the boiling point (b.p) of the resulting solutions.

• NaCl solution will show higher elevation of boiling point

• Glucose solution will show higher elevation of boiling point

• Both the solutions will show equal elevation of boiling point

• The boiling point elevation will be shown by neither of the solutions

Which of the following will show a negative deviation from Raoult's law?

• Acetone-benzene

• Acetone-ethanol

• Benzene-methanol

• Acetone-chloroform

Identify the correct statement from the following in a chemical reaction.

• The entropy always increases

• The change in entropy along with the suitable change in enthalpy decides the rate of reaction

• The enthalpy always decreases

• Both the enthalpy and the entropy remain constant

Which one of the following is wrong about molecularity of a reaction?

• It may be whole number or fractional

• It is calculated from reaction mechanism

• It is the number of molecules of the reactants taking part in a single step chemical reaction

• It is always equal to the order of elementary reaction

The stable bivalency of Pb and trivalencey of Bi is:

• due to d contraction in Pb and Bi

• due to relativistic contraction of the 6s orbitals of Pb and Bi, leading to inert pair effect

• due to screening effect

• due to the attainment of noble liquid configuration

CO is practically non-polar since

• the sigma electron drift from C to O is almost nullified by the pi-electron drift from O to C

• the sigma electron drift from O to C is almost nullified by the pi-electron drift from C to O

• the bond moment is low

• there is a triple bond between C and O

The number of acidic protons in H₃PO₃ are:

• 0

• 1

• 2

• 3

In the brown ring complex [Fe(H₂O)₅(NO)]SO₄, nitric oxide behaves as:

• NO⁺

• neutral NO molecule

• NO^-

• NO^2-

On passing C ampere of current for the time 't' sec through 1 L of 2 (M) CuSO₄ solution (atomic weight of Cu= 63. 5), the amount 'm' of Cu (in gram) deposited on cathode will be

• m = Ct/(63.5 x 96500)

• m = Ct/(31.25 X 96500)

• m = (C x 96500)/(31.25 x t)

• m = (31.25 X C x t)/96500