Chemistry questions
29404 published questions with worked solutions.
- Standard reduction electrode potentials of three metals A, B and C are respectively +0.5 V, −3.0 V and −1.2 V. The reducing...
- The standard reduction potentials for Zn^ 2+ /Zn , Ni^ 2+ /Ni and Fe^ 2+ /Fe are −0.76, −0.23 and −0.44 V respectively. The...
- The CORRECT order of E^ _ M^ 2+ /M values with negative sign for the four successive elements Cr, Mn, Fe and Co is _________...
- The E^ _ M^ 3+ /M^ 2+ values for Cr, Mn, Fe and Co are −0.41, +1.57, +0.77 and +1.97 V respectively. For which one of these...
- Reducing powers of A, B, C and D are w, x, y and z respectively such that z > y > x > w. The one which will displace all others...
- The standard oxidation potential values of A, B, C and D are −0.03 V, +0.108 V, −0.07 V and +0.1 V respectively. The spontaneous...
- The highest electrical conductivity of the following aqueous solution is of _________ [AIEEE 2005]
- When the sample of copper with zinc impurity is to be purified by electrolysis, the appropriate electrodes are ________ [AIEEE...
- The standard reduction potentials of Cu^ 2+ /Cu and Cu^ 2+ /Cu^+ are 0.337 and 0.153 V respectively. The standard electrode...
- Electrolyte can conduct electricity because _______
- The metal that CANNOT be obtained by electrolysis of an aqueous solution of its salts is _________
- Element A (atomic mass 112) and element B (atomic mass 27) form chlorides. Solutions of these chlorides are electrolysed...
- Use of electrolysis is _________ [AFMC 1995]
- At 25 ℃, the molar conductance of 0.007 M hydrofluoric acid is 150 mho ,cm^2 ,mol^ -1 and _ = 500 mho ,cm^2 ,mol^ -1 . The value...
- The process in which metal surface is made inactive is called ______ [MH CET 2015]
- Zn Zn^ 2+ + 2e^- ; E° = +0.76 V and Fe Fe^ 2+ + 2e^- ; E° = +0.41 V. The e. m. f. for the cell reaction Fe^ 2+ + Zn Zn^ 2+ + Fe...
- During the electrolysis of an electrolyte, the number of ions produced, is directly proportional to the __________ [AFMC 2002]
- A current of 3.7 A is passed for six hours between Ni electrodes in 0.5 L of 2 M solution of Ni(NO_3)_2 . The molarity of...
- A device that converts energy of combustion of fuels like hydrogen and methane, directly into electrical energy is known as...
- For the electrochemical cell, M|M^+||X^-|X , E^ _ (M^+|M) = 0.44 V and E^ _ (X|X^-) = 0.33 V. From this data one can deduce that...