Only One Option Correct Type
This section contains multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONLY ONE is correct.
Q.
Cl2 gas is passed into a solution containing KF, Kl and KBr, and CHCI3 is added. There is a colour in CHCI3 (lower) layer. It is due to
Select the correct statement(s) about galvanic cell (Daniell cell) with E° cell = 1.10 V
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Given,
E° Ag+/Ag = 0.80 V
E° Mg2+/Mg = -2.37 V
E° Cu2+/Cu = + 0.34V
E° Hg2+/Hg = 0.79V
Q.
Which of the following statement(s) is/are correct?
One mole of Ag2CO3 is strongly heated in an open vessel. Residue wll be
Zinc ,silver and iron plates are dipped in CuSO4 solutions placed in different vessels as shown:
Blue colour of CuSO4 fades in
For the following half -cell reactions ,E° values are:
Mn2+(aq) + 2H2O(l) MnO2(s) + 4H+(aq) + 2e-, E0 = -1.23V
MnO-4 (aq) + 4H+(aq) +3e- MnO2(s) + 2H2O(l), E0 = +1.70 V
Thus
Consider some facts about Standard Hydrogen Electrode(SHE).
I. It is assigned a zero potential at all temperature corresponding to the reaction.
II. Platinum electrode coated with platinum black is dipped in acidic solution and H2 gas is bubbled through it.
III. Concentration of both are oxidised and reduced forms of hydrogen is maintained at unity.
Select the correct facts
The gas X at 1 atm is bubbled through a solution containing a mixture of 1 M Y- and 1 M Z- at 298 K.If the standard reduction potential
then,
The standard reduction potential values of three metallic cations X, Y, Z are 0.52, -3.03 and -1.18 V respectively. The order of reducing power of the corresponding metals is
A solution containing one mole per litre each of Cu(NO3)2 ,AgNO3 ,Hg2(NO3)2 and Mg(NO3)2 is being electrolysed using inert electrodes. The value of standard redution potentials are
with increasing voltage , the sequence of deposition of metals on the cathode will be
The standard reduction potentials at 298K for the following half-cell are given
Which is the strongest reducing agent?
The Eo M3+/M2+ values for Cr, Mn, Fe and Co are - 0.41 V, +1,57 V, + 0.77 V and m /m 1.97 V respectively. For which one of these metals the change in oxidation state from +2 to +3 is easiest?
Given the standard electrode potentials
I. K+/K = -2.93V,
II. Ag+/Ag = 0.80V,
III. Hg2+/Hg = 0.79 V
IV. Mg2+/Mg = -2.37V,
V. Cr3+/Cr = - 0.74 V
These metals are arranged in increasing reducing power as
Statement Type
Direction : This section is based on Statement I and Statement II. Select the correct answer from the codes given below.
Statement I : CuSO4 can be stored in a vessel made of zinc.
Statement II : w.r.t SHE
Statement I : When AgNO3 solution is stirred with a spoon made of copper,solution turns blue.
Statement II : In electrochemical series ,copper is above silver
The positive value of the standard electrode potential of Cu2+/Cu,
(E°Cu2+/Cu = 0.34 V) indicates that
Consider the following half-reactions:
Select the correct statements on the basis of the above data
Select the correct statement(s) based on the following half-reaction:
Matching List Type
Choices for the correct combination of elements from Column I and Column II are given as options (a), (b), (c) and (d), out of which one is correct
Match the half-cell reaction in Column I with their values in Column II and select the answer from the answer codes at the end.
Passage I
Reducing power of different species is in the order
Passage II
Accidently chewing of a stray fragment of aluminium foil can cause a sharp tooth pain if the aluminium comes in contact with an amalgam filling. This filling, an alloy of silver, tin and mercury acts as the cathode (of a tiny galvanic cell), the aluminium as anode and saliva (of mouth) serves as electrolyte. When the aluminium and the filling come in contact, an electric current passes from aluminium to the filling, which is sensed by a nerve in the teeth.
Q.
Net reaction taking place when amalgam is in contact with aluminium foil is
Passage II
Accidently chewing of a stray fragment of aluminium foil can cause a sharp tooth pain if the aluminium comes in contact with an amalgam filling. This filling, an alloy of silver, tin and mercury acts as the cathode (of a tiny galvanic cell), the aluminium as anode and saliva (of mouth) serves as electrolyte. When the aluminium and the filling come in contact, an electric current passes from aluminium to the filling, which is sensed by a nerve in the teeth.
Q.
Standard emf experienced by the person with dental filling is
Passage III
When suspected drunk drivers are tested with a breathalyser, the alcohol (ethanol) in the exhaled breath is oxidised to ethanoic acid with an acidic solution of potassium dichromate.
Q.
Under standard state, E°cell of the breathalyser would be
Passage III
When suspected drunk drivers are tested with a breathalyser, the alcohol (ethanol) in the exhaled breath is oxidised to ethanoic acid with an acidic solution of potassium dichromate.
Q.
Under the condition of unit activity of each species,emf recorded in the breathalyser at pH 4 would be
E° values of Mn+ + ne- → M are given below
Fe2+/Fe -0.44 V, Mg2+/Mg -2.37 V, Pt(H2)/H+ 0.00 V,
AI3+/AI -1.66 V , Zn2+/Zn - 0.76 V, Cu2+/Cu +0.34 V,
Ag+/Ag + 0.80 V, Ni2+/Ni -0.26 V
How many of the metals can be used to prevent corrosion of Ni to Ni2+?
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