Water, as a poor electrical conductor needs some electrolyte solution to give the necessary conduction for the electrolysis to proceed
Задание #64
Вопрос : Aluminium displaces hydrogen from acids, but copper does not. A galvanic cell prepared by combining Cu/Cu2+ and Al/Al3+ has an emf of 2.0 V at 298 K. If the potential of copper electrode is +0.34 V, that of aluminium electrode is ...
V
2) - 0.34 V
3) - 2.34 V
4) + 1.66 V
5) + 2.34 V
Задание #65
Вопрос : Find the valency of the metal whose atomic weight is 96 and 0.3605g of a metal is deposited on the electrode by passing 1.2 ampere current for 15 minutes:
1) 1
2) 4
3) 2
4) 3
5) None
Задание #66
Вопрос : The coordination number of the complex compound Au(NH3)42(SO4)3 is equal ...
1) 4
2) 8
3) 3
4) 2
5) 6
Задание #67
Вопрос : A solution with a pH of 12 is:
Strongly acidic
2) weakly basic
3) weakly acidic
4) water
5) strongly basic
Задание #68
Вопрос : What is the temporary hardness of water, if for titration of 100 ml of water was consumed 5.65 mL of 0.02 N hydrochloric acid solution (mmol / L)?
1) 8,85
2) 1,13
3) 2,8
4) 4,0
5) 11,3
Задание #69
Вопрос : NO2 is not obtained on heating ...
1) AgNO3
2) KNO3
3) Cu(NO3)2
4) Pb(NO3)2
5) none of these
Задание #70
Вопрос : The constitute of a Daniell cell is:
Zn - Cu cell
2) Cu - Ag cell
3) Mg - Cu cell
4) Zn - Ag cell
5) None of these
Задание #71
Вопрос : When the value of the electrode potential of the metal increases in the electrochemical series, we observe that .....
1) chemical activity of metals increases
Reducing ability of the metal cation increases
3) oxidizing properties of the metal atom increases
4) metal solubility in acid increases
5) metal solubility in water increases
Задание #72
Вопрос : Magnesium metal can be attached to the steel pipeline to prevent rusting. What name is given to this type of protection provided by magnesium?
1) Galvanising
Anodising
3) Electroplating
4) Natural protection
5) Use a Sacrificial anode
Задание #73
Вопрос : When electrolysis of aqueous NaCl solution is carried out, the products are:
1) Na at cathode and Cl2 at anode
2) H2 at cathode and Cl2 at anode
|
|
|
3) NaOH at cathode and Cl2 at anode
4) H2 at cathode and O2 at anode
5) Na at cathode and O2 at anode
Задание #74
Вопрос : An equivalent weight of oxidizer KMnO4 in a water neutral medium is equal ... (g/mol):
1) 158
2) 31,6
3) 79
4) 25,02
5) 52,6
Задание #75
Вопрос : Redox reactions in which the both oxidizing and reducing agents are composed into one molecule is called:
1) Intramolecular
2) Diplacement
3) Combustion
4) Intermolecular
5) Disproportionation
Задание #76
Вопрос : Which of the following statements is true?
1) H3PO3 is a stronger acid than H2SO3
2) HClO4 is a weaker acid than HClO3
3) HNO3 is a stronger acid than HNO2
4) In aqueous medium HF is a stronger acid than HCl
5) HNO2 is a stronger acid than HCl
Задание #77
Вопрос : When Cl2 gas reacts with hot and concentrated sodium hydroxide (NaOH) solution, the oxidation number of chlorine changes from ...
1) Zero to - 1 and zero to + 5
2) Zero to + 1 and zero to -5
3) Zero to - 1 and zero to + 3
4) Zero to + 3 and zero to + 5
5) Zero to + 1 and zero to -3
Задание #78
Вопрос : 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 ...
1) 3, 5, 7, 1
2) 6, 4, 3, 2
3) 1, 5, 3, 7
4) 1, 3, 4, 5
5) 4, 3, 1, 5
Задание #79
Вопрос : The chemical destruction of metal in fluids, electrolytes which are not is called:
1) Atmospheric corrosion
2) Gas corrosion
3) Liquid corrosion
4) Electrochemical corrosion
5) Biocorrosion
Задание #80
Вопрос : Which of the following reactions is NOT a redox reaction?
1) NaI + Cl2 ---> NaCl + I2
2) NaOH + HCl ---> NaCl + H2O
3) H2O2 ---> H2O + O2
4) Ni2+ + Fe ---> Fe2+ + Ni
5) Na + Cl2 ---> NaCl
Задание #81
Вопрос : For an aqueous solution with pOH=5, hydrogen (H+) ions concentration will be equal to.... (mol/L):
1) 10-1
|
|
|
2) 10-2
3) 10-9
4) 10-4
5) 10-5
Задание #82
Вопрос : What is the oxidation state of gold in complex ion [Au(CN)4]- ?
1) + 3
2) + 6
3) + 4
4) + 2
5) + 5
Задание #83
Вопрос : A certain current liberates 0.504 g of hydrogen in 2 hours. How many grams of oxygen can be liberated by the same current in same time?
1) 1.0 g
G
3) 2.0 g
4) 0.252 L
5) 8.0 g
Задание #84
Вопрос : Choose substances that form aqueous solution with acidic medium (pH<7):
1) KBr 2) CuSO4 3) KI 4) KNO3 5) Na2SiO3
Задание #85
Вопрос : The method used for galvanisation of nuts, bolts, screws and washers is known as:
1) Hot dipping
2) Electro-galvanisation
Sheradizing
4) Cathodic protection
5) Metallizing
Задание #86
Вопрос : Which of the followinf p-block elements does not show allotropy?
1) phosphorus
Chlorine
3) carbon
4) sulfur
5) arsenic
Задание #87
Вопрос : Which of the following terms refers to the number of molecules or ions attached to a central metallic atom?
1) none of these
2) connection number
3) no answer
Coordination number
5) bonding number
Задание #88
Вопрос : Which of the following is NOT produced during the electrolysis of water?
Electricity
2) Hydrogen
3) Oxygen
4) Acid
5) Base
Задание #89
Вопрос : The quantity of electricity required to liberate or deposit 1 gram equivalent of a substance from its solution during electrolysis is known as:
1) Om
2) None of these
3) Coulomb
Faraday
5) Ampere
Задание #90
Вопрос : Metals can be good conductors because of ...
1) protons
2) immobile ions
3) anti neutrino
Mobile electrons
5) neutrons
Задание #91
|
|
|
Вопрос : A complex compound in which the oxidation number of a metal is zero is ...
1) K4 [Fe (CN)6]
2) [Ni (CO)4]
3) [Cr (NH3)6] Cl3
4) [Cu (NH3)4] [PtCl4]
5) [Co Cl3 (NH3)3]
Задание #92
Вопрос : Transition elements are ....
1) titanium
2) zinc
3) cobalt
4) scandium
All of them
Задание #93
Вопрос : What metals will react with diluted acids, as HCl and H2SO4, and produce hydrogen gas?
Zn, Ag
2) Au, Ag
3) Ca, Cu
4) Mg, Zn
5) Cd, Hg
Задание #94
Вопрос : A potassium dichromate K2Cr2O7 acts as an oxidizing agent in ..................... medium
1) neutral
Acidic
3) in ammonium
4) in water
5) basic
Задание #95
Вопрос : The greatest rate of corrosion will be observed between a pair of metal:
1) Са-Pb
2) Ca-Fe
3) Са-Ni
Са-Sn
5) Ca-Cu
Задание #96
Вопрос : What is the pH value of the solution, with a content of [OH-] = 10-3 mol /L?
1) 5 2) 8 3) 3 4) 9 5) 11
Задание #97
Вопрос : In high energy density batteries Lithium is used as an electrode because:
1) it is reactive
2) it is the lightest metal
Дата добавления: 2018-09-20; просмотров: 404; Мы поможем в написании вашей работы! |
Мы поможем в написании ваших работ!