Class Chemistry English Volume · Part

Pb + Cl O +4H + Ag + Fe + Cu + 2H + Pb + Fe + Zn + Al + Mg + Li + Mg Al Zn Fe Pb Cu Fe + Ag 2H O 2Cl - Pb + 2F - H + 1e - 1e - 1e - 2e - 2e - 2e - 2e - 2e - 2e - 2e - 2e - 2e - 3e - 4e - . The molar conductivity of a . mol dm - solution of AgNO with electrolytic conductivity of S cm at K is a) . S cm mol - b) - .

S cm mol c) . S cm mol - d) . S cm mol - . Electrolyte KCl KNO HCl NaOAC NaCl (S cm mol – Λ − ) .

Calculate HOAC Λ  using appropriate molar conductances of the electrolytes listed above at infinite dilution in water at C o a) . b) . c) . d) .

. Faraday constant is defined as a) charge carried by electron b) charge carried by one mole of electrons c) charge required to deposit one mole of substance d) charge carried by electrons. . How many faradays of electricity are required for the following reaction to occur MnO Mn + a) 5F b) 3F c) 1F d) 7F .

A current strength of . A was passed through molten Calcium oxide for 41minutes and seconds. The mass of Calcium in grams deposited at the cathode is (atomic mass of Ca is 40g / mol and 1F = 96500C). a) b) c) d) .

During electrolysis of molten sodium chloride, the time required to produce .1mole of chlorine gas using a current of 3A is a) minutes b) . minutes c) minutes d) minutes . The number of electrons delivered at the cathode during electrolysis by a current of 1A in seconds is (charge of electron = . × − C ) a) .

b) c) d) . Which of the following electrolytic solution has the least specific conductance a) 2N b) .002N c) .02N d) .2N . While charging lead storage battery a) PbSO on cathode is reduced to Pb b) PbSO on anode is oxidised to PbO c) PbSO on anode is reduced to Pb d) PbSO on cathode is oxidised to Pb . Among the following cells I) Leclanche cell II) Nickel – Cadmium cell III) Lead storage battery IV) Mercury cell Primary cells are a) I and IV b) I and III c) III and IV d) II and III .

Zinc can be coated on iron to produce galvanized iron but the reverse is not possible. It is because a) Zinc is lighter than iron b) Zinc has lower melting point than iron c) Zinc has lower negative electrode potential than iron d) Zinc has higher negative electrode potential than iron . Assertion : pure iron when heated in dry air is converted with a layer of rust. Reason : Rust has the composition Fe O a) if both assertion and reason are true and reason is the correct explanation of assertion.

b) if both assertion and reason are true but reason is not the correct explanation of assertion. c) assertion is true but reason is false d) both assertion and reason are false. . In H -O fuel cell the reaction occurs at cathode is a) O (g) + 2H O + 4e 4OH (aq) ( ) l b) H (aq) + OH (aq) H O ( l ) c) 2H (g) + O (g) 2H O (g) d) H + e − → .

The equivalent conductance of M solution of a weak monobasic acid is mho cm equivalent – and at infinite dilution is mho cm equivalent – . The dissociation constant of this acid is a) b) . c) d) . .

A conductivity cell has been calibrated with a .01M, : electrolytic solution (specific conductance ( κ = S cm − ) in the cell and the measured resistance was W at  C . The cell constant is, a) c m b) c m − c) c m − d) . . Conductivity of a saturated solution of a sparingly soluble salt AB ( : electrolyte) at 298K is S m .

Solubility product of the salt AB at 298K Λ m AB S m mol 